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4. Case Studies

Author

Liu, K. W., Xu, Q. F., Wang, G., Chen, F. M., Leng, Y. B., Yang, J., Harries, K. A., Liu, K. W., Xu, Q. F., Wang, G., Chen, F. M., Leng, Y. B., Yang, J., and Harries, K. A.

Published
2022
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5. Standards

Author

Liu, K. W., Xu, Q. F., Wang, G., Chen, F. M., Leng, Y. B., Yang, J., Harries, K. A., Liu, K. W., Xu, Q. F., Wang, G., Chen, F. M., Leng, Y. B., Yang, J., and Harries, K. A.

Published
2022
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10. Three-dimensional finite element modelling of a full-scale geosynthetic-reinforced, pile-supported embankment

Author

Rowe, R. Kerry and Liu, K.-W.

Subjects
Geosynthetics -- Usage, Engineering models -- Usage, Embankments -- Design and construction -- Models, Soil mechanics -- Models, Finite element method -- Analysis -- Models -- Usage, Earth sciences
Abstract

The performance of four sections of a full-scale embankment constructed on soft soil is examined using a fully coupled and fully three-dimensional finite element analysis. The four sections had similar embankment loadings but different improvement options (one unimproved, one with pile-support only, one with a single layer geotextile-reinforced platform and pile-support, and one with two layers of geogrid-reinforced platform and pile-support). Like the field data, the numerical results show that the inclusion of piles decreases the settlement at the subsoil surface to 52% of that for the unimproved section, and the addition of a single layer of geotextile reinforcement J = 800 kN/m) further reduced settlement to only 31% of that of the unimproved section. The effects of geosynthetic reinforcement and multiple layers of reinforcement on the performance of the pile-supported embankment are discussed. The relative load transfer is calculated using eight existing methods and they are compared with the field measurements and numerical results. Key words: geosynthetics, reinforcement, piles, embankments, deformations, three-dimesional analysis, coupled modelling, load transfer. Les performances de quatre sections d'un remblai en talus en taille reelle construit sur un sol mou sont etudiees a l'aide d'une analyse entierement couplee et tridimensionnelle basee sur la methode des elements finis. Les quatre sections presentaient des chargements similaires, mais les solutions d'ameliorations differaient pour chacune d'elle (une section depourvue d'elements d'amelioration; une autre, soutenue uniquement par des pieux; une troisieme, soutenue par des pieux et comportant une plateforme renforcee a l'aide d'une simple couche de geotextile; et une quatrieme, soutenue par des pieux et comportant une plateforme renforcee au moyen de deux couches de geogrille). Tout comme les donnees de terrain, les resultats numeriques montrent que le tassement a la surface du sous-sol diminue sous l'effet de l'inclusion de pieux et equivaut a 52% de celui de la section non amelioree et que l'ajout d'un dispositif de renforcement constitue d'une simple couche de geotextile (J = 800 kN/m) reduit davantage le tassement, qui n'equivaut alors qu'a 31 % de celui de la section non amelioree. Le present article traite des effets du dispositif de renforcement geosynthetique et des multiples couches de ce dispositif sur les performances du remblai soutenu par des pieux. Le transfert de charge relatif est calcule a l'aide de huit methodes existantes et les resultats obtenus sont compares avec les mesures effectuees sur le terrain et avec les resultats numeriques. [Traduit par la Redaction] Mots-cles: materiaux geosynthetiques, renforcement, pieux, remblais en talus, deformations, analyse tridimensionnelle, modelisation couplee, transfert de charge., Introduction One widely adopted approach to constructing embankments over soft soils is the use of basal geosynthetic reinforcement or the combined use of basal geosynthetic reinforcement and prefabricated vertical drains [...]

Published
2015
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20. Erratum: A Hematogenous Route for Medulloblastoma Leptomeningeal Metastases (S0092867418301156 (2018) 172(5) (1050–1062.e14) (S0092867418301156) (10.1016/j.cell.2018.01.038))

Author

Garzia L., Kijima N., Morrissy A. S., De Antonellis P., Guerreiro-Stucklin A., Holgado B. L., Wu X., Wang X., Parsons M., Zayne K., Manno A., Kuzan-Fischer C., Nor C., Donovan L. K., Liu J., Qin L., Garancher A., Liu K. -W., Mansouri S., Luu B., Thompson Y. Y., Ramaswamy V., Peacock J., Farooq H., Skowron P., Shih D. J. H., Li A., Ensan S., Robbins C. S., Cybulsky M., Mitra S., Ma Y., Moore R., Mungall A., Cho Y. -J., Weiss W. A., Chan J. A., Hawkins C. E., Massimino M., Jabado N., Zapotocky M., Sumerauer D., Bouffet E., Dirks P., Tabori U., Sorensen P. H. B., Brastianos P. K., Aldape K., Jones S. J. M., Marra M. A., Woodgett J. R., Wechsler-Reya R. J., Fults D. W., Taylor M. D., Garzia, L., Kijima, N., Morrissy, A. S., De Antonellis, P., Guerreiro-Stucklin, A., Holgado, B. L., Wu, X., Wang, X., Parsons, M., Zayne, K., Manno, A., Kuzan-Fischer, C., Nor, C., Donovan, L. K., Liu, J., Qin, L., Garancher, A., Liu, K. -W., Mansouri, S., Luu, B., Thompson, Y. Y., Ramaswamy, V., Peacock, J., Farooq, H., Skowron, P., Shih, D. J. H., Li, A., Ensan, S., Robbins, C. S., Cybulsky, M., Mitra, S., Ma, Y., Moore, R., Mungall, A., Cho, Y. -J., Weiss, W. A., Chan, J. A., Hawkins, C. E., Massimino, M., Jabado, N., Zapotocky, M., Sumerauer, D., Bouffet, E., Dirks, P., Tabori, U., Sorensen, P. H. B., Brastianos, P. K., Aldape, K., Jones, S. J. M., Marra, M. A., Woodgett, J. R., Wechsler-Reya, R. J., Fults, D. W., and Taylor, M. D.

Abstract

(Cell 172, 1050–1062; February 22, 2018) It has come to our attention that in preparing the final version of the manuscript, we made a mistake in the legend for Figure 6. The figure includes 4 major panels labeled A, B, C and D, and we inadvertently included descriptions for panels A, B, C, D, and E. The information in the Figure 6E legend describes panel 6D and should have been labeled as such, and the text labeled 6D should have been deleted. The error has been corrected online, and we apologize for any confusion we may have caused.

Published
2018

24. A charge control and current-voltage model for inverted MODFET's

Author

Anwar, A.F.M., Liu, K.-W., and Khondker, A.N.

Subjects
Field-effect transistors -- Research, Semiconductor doping -- Research, Gallium arsenide semiconductors -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The quantum mechanical properties of two types of inverted GaAs/A/GaAs modulation doped field effect transistor (MODFET) are determined by using a self consistent solution. The charge control in the MODFET and the current voltage characteristics are modelled by using the x(av) ad E(F) as functions of the n(S) in the equation. The quantum mechanical properties provide information on the confining of the electron gas within the MODFET.

Published
1995

32. Effect of Electrode Spacing on The Properties of ZnO Based MSM Ultraviolet Photodetector

Author

Zhang Z.-Z., Li C.-Q., Shen D.-Z., Liu K.-W., and Chen H.-Y.

Subjects
Radiation, Materials science, business.industry, Detector, Photodetector, Chemical vapor deposition, Condensed Matter Physics, medicine.disease_cause, Electronic, Optical and Magnetic Materials, Responsivity, Depletion region, Electrode, medicine, Sapphire substrate, Optoelectronics, business, Ultraviolet
Abstract

By using mental-organic chemical vapor deposition, ZnO films were prepared on sapphire substrate in this work. Three MSM ultraviolet photodetectors with different electrode spacings were fabricated on ZnO films. The detector responsivity achieves marked increase from 15 mA/W to 75 mA/W as the electrode spacing decreases from 150 m to 5 m. At the same time, with the decrease of the electrode spacing, I-V curve of the device changes significantly. It is attributed to that the electrode spacing affects the properties of MSM photodetectors because it results in different depletion region width and the resistance between the electrode.

Published
2014

34. Indium-doped ZnO nanowires: Optical properties and room-temperature ferromagnetism.

Author

Liu, K. W., Sakurai, M., and Aono, M.

Subjects
*INDIUM, *NANOWIRES, *OPTICAL properties, *FERROMAGNETISM, *PHYSICS research
Abstract

We report the optical and magnetic properties of ZnO, Zn0.97In0.03O, and Zn0.94In0.06O nanowires (NWs). All samples have similar wirelike shape with an average diameter of about 70 nm and a length of about 10 μm. The comparison of photoluminescence (PL) spectra at 10 K indicated that a new broad emission band appeared after indium doping, which is associated with donor-acceptor-pair recombination. Additionally, the intensity of oxygen-vacancies-induced visible emission increased with increasing In content, indicating that In doping can induce many oxygen vacancies. Furthermore, magnetic measurements revealed that pure ZnO NWs are diamagnetic, while indium-doped ZnO NWs exhibit intrinsic ferromagnetism at room temperature. With the increase in In content, the coercive field and the magnetic moment for indium-doped ZnO NWs increase largely. Ferromagnetic ordering can be interpreted as being due to O vacancies induced by In doping, which is in good agreement with PL results. [ABSTRACT FROM AUTHOR]

Published
2010
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35. Influence of thin metal nanolayers on the photodetective properties of ZnO thin films.

Author

Liu, K. W., Liu, B., Wang, S. J., Wei, Z. P., Wu, T., Cong, C. X., Shen, Z. X., Sun, X. W., and Sun, H. D.

Subjects
*ZINC oxide thin films, *PHOTOCONDUCTIVITY, *NANOSTRUCTURED materials, *PULSED laser deposition, *PLATINUM, *GOLD
Abstract

We investigate the photoconductivity properties of ZnO thin films prepared by pulsed laser deposition with and without metals (Au or Pt) on the surface. The covering of nanostructured metals can largely enhance the photocurrent. Meanwhile, the dark currents have been increased significantly due to the increase in carrier concentration and mobility near the surface of ZnO thin film. Although plasmonic effect was observed by the photoluminescence enhancement, the main mechanism of the increase in the dark current and photoresponsivity for ZnO photoconductors has been interpreted by surface states, interface states, and persistent photoconductivity. [ABSTRACT FROM AUTHOR]

Published
2009
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36. An envelope function description of the quantum well formed in strained layer SiGe/Si modulation doped field effect transistors

Author

Anwar, A.F.M., Carroll, R.D., and Liu, K.-W.

Subjects
Quantum wells -- Research, Schrodinger equation -- Usage, Field-effect transistors -- Analysis, Physics
Abstract

The quantum mechanical properties of the quantum well (QW) formed in SiGe/Si/SiGe strained layer modulation doped field effect transistors are calculated by solving Schrodinger and Poisson equations, which produces an electron quantum well in Si due to the strain. Excellent confinement at low temperature is seen by calculating the two-dimensional electron gas distribution. Very low electron concentration at room temperature shows poor confinement, though it improves as the number of channel electrons increase. Loss of confinement can result due to large electron concentration in a wide QW.

Published
1993

48. MEDULLOBLASTOMA

Author

Vaidyanathan, G., primary, Gururangan, S., additional, Bigner, D., additional, Zalutsky, M., additional, Morfouace, M., additional, Shelat, A., additional, Megan, J., additional, Freeman, B. B., additional, Robinson, S., additional, Throm, S., additional, Olson, J. M., additional, Li, X.-N., additional, Guy, K. R., additional, Robinson, G., additional, Stewart, C., additional, Gajjar, A., additional, Roussel, M., additional, Sirachainan, N., additional, Pakakasama, S., additional, Anurathapan, U., additional, Hansasuta, A., additional, Dhanachai, M., additional, Khongkhatithum, C., additional, Hongeng, S., additional, Feroze, A., additional, Lee, K.-S., additional, Gholamin, S., additional, Wu, Z., additional, Lu, B., additional, Mitra, S., additional, Cheshier, S., additional, Northcott, P., additional, Lee, C., additional, Zichner, T., additional, Lichter, P., additional, Korbel, J., additional, Wechsler-Reya, R., additional, Pfister, S., additional, Project, I. P. T., additional, Li, K. K.-W., additional, Xia, T., additional, Ma, F. M. T., additional, Zhang, R., additional, Zhou, L., additional, Lau, K.-M., additional, Ng, H.-K., additional, Lafay-Cousin, L., additional, Chi, S., additional, Madden, J., additional, Smith, A., additional, Wells, E., additional, Owens, E., additional, Strother, D., additional, Foreman, N., additional, Packer, R., additional, Bouffet, E., additional, Wataya, T., additional, Peacock, J., additional, Taylor, M. D., additional, Ivanov, D., additional, Garnett, M., additional, Parker, T., additional, Alexander, C., additional, Meijer, L., additional, Grundy, R., additional, Gellert, P., additional, Ashford, M., additional, Walker, D., additional, Brent, J., additional, Cader, F. Z., additional, Ford, D., additional, Kay, A., additional, Walsh, R., additional, Solanki, G., additional, Peet, A., additional, English, M., additional, Shalaby, T., additional, Fiaschetti, G., additional, Baulande, S., additional, Gerber, N., additional, Baumgartner, M., additional, Grotzer, M., additional, Hayase, T., additional, Kawahara, Y., additional, Yagi, M., additional, Minami, T., additional, Kanai, N., additional, Yamaguchi, T., additional, Gomi, A., additional, Morimoto, A., additional, Hill, R., additional, Kuijper, S., additional, Lindsey, J., additional, Schwalbe, E., additional, Barker, K., additional, Boult, J., additional, Williamson, D., additional, Ahmad, Z., additional, Hallsworth, A., additional, Ryan, S., additional, Poon, E., additional, Ruddle, R., additional, Raynaud, F., additional, Howell, L., additional, Kwok, C., additional, Joshi, A., additional, Nicholson, S. L., additional, Crosier, S., additional, Wharton, S., additional, Robson, K., additional, Michalski, A., additional, Hargrave, D., additional, Jacques, T., additional, Pizer, B., additional, Bailey, S., additional, Swartling, F., additional, Petrie, K., additional, Weiss, W., additional, Chesler, L., additional, Clifford, S., additional, Kitanovski, L., additional, Prelog, T., additional, Kotnik, B. F., additional, Debeljak, M., additional, Grotzer, M. A., additional, Gevorgian, A., additional, Morozova, E., additional, Kazantsev, I., additional, Iukhta, T., additional, Safonova, S., additional, Kumirova, E., additional, Punanov, Y., additional, Afanasyev, B., additional, Zheludkova, O., additional, Grajkowska, W., additional, Pronicki, M., additional, Cukrowska, B., additional, Dembowska-Baginska, B., additional, Lastowska, M., additional, Murase, A., additional, Nobusawa, S., additional, Gemma, Y., additional, Yamazaki, F., additional, Masuzawa, A., additional, Uno, T., additional, Osumi, T., additional, Shioda, Y., additional, Kiyotani, C., additional, Mori, T., additional, Matsumoto, K., additional, Ogiwara, H., additional, Morota, N., additional, Hirato, J., additional, Nakazawa, A., additional, Terashima, K., additional, Fay-McClymont, T., additional, Walsh, K., additional, Mabbott, D., additional, Sturm, D., additional, Northcott, P. A., additional, Jones, D. T. W., additional, Korshunov, A., additional, Pfister, S. M., additional, Kool, M., additional, Hooper, C., additional, Hawes, S., additional, Kees, U., additional, Gottardo, N., additional, Dallas, P., additional, Siegfried, A., additional, Bertozzi, A. I., additional, Sevely, A., additional, Loukh, N., additional, Munzer, C., additional, Miquel, C., additional, Bourdeaut, F., additional, Pietsch, T., additional, Dufour, C., additional, Delisle, M. B., additional, Kawauchi, D., additional, Rehg, J., additional, Finkelstein, D., additional, Zindy, F., additional, Phoenix, T., additional, Gilbertson, R., additional, Trubicka, J., additional, Borucka-Mankiewicz, M., additional, Ciara, E., additional, Chrzanowska, K., additional, Perek-Polnik, M., additional, Abramczuk-Piekutowska, D., additional, Jurkiewicz, D., additional, Luczak, S., additional, Kowalski, P., additional, Krajewska-Walasek, M., additional, Sheila, C., additional, Lee, S., additional, Foster, C., additional, Manoranjan, B., additional, Pambit, M., additional, Berns, R., additional, Fotovati, A., additional, Venugopal, C., additional, O'Halloran, K., additional, Narendran, A., additional, Hawkins, C., additional, Ramaswamy, V., additional, Taylor, M., additional, Singhal, A., additional, Hukin, J., additional, Rassekh, R., additional, Yip, S., additional, Singh, S., additional, Duhman, C., additional, Dunn, S., additional, Chen, T., additional, Rush, S., additional, Fuji, H., additional, Ishida, Y., additional, Onoe, T., additional, Kanda, T., additional, Kase, Y., additional, Yamashita, H., additional, Murayama, S., additional, Nakasu, Y., additional, Kurimoto, T., additional, Kondo, A., additional, Sakaguchi, S., additional, Fujimura, J., additional, Saito, M., additional, Arakawa, T., additional, Arai, H., additional, Shimizu, T., additional, Jurkiewicz, E., additional, Daszkiewicz, P., additional, Drogosiewicz, M., additional, Hovestadt, V., additional, Buchhalter, I., additional, Jager, N. N., additional, Stuetz, A., additional, Johann, P., additional, Schmidt, C., additional, Ryzhova, M., additional, Landgraf, P., additional, Hasselblatt, M., additional, Schuller, U., additional, Yaspo, M.-L., additional, von Deimling, A., additional, Eils, R., additional, Modi, A., additional, Patel, M., additional, Berk, M., additional, Wang, L.-x., additional, Plautz, G., additional, Camara-Costa, H., additional, Resch, A., additional, Lalande, C., additional, Kieffer, V., additional, Poggi, G., additional, Kennedy, C., additional, Bull, K., additional, Calaminus, G., additional, Grill, J., additional, Doz, F., additional, Rutkowski, S., additional, Massimino, M., additional, Kortmann, R.-D., additional, Lannering, B., additional, Dellatolas, G., additional, Chevignard, M., additional, Solecki, D., additional, McKinnon, P., additional, Olson, J., additional, Hayden, J., additional, Ellison, D., additional, Buss, M., additional, Remke, M., additional, Lee, J., additional, Caspary, T., additional, Castellino, R., additional, Sabel, M., additional, Gustafsson, G., additional, Fleischhack, G., additional, Benesch, M., additional, Navajas, A., additional, Reddingius, R., additional, Delisle, M.-B., additional, Lafon, D., additional, Sevenet, N., additional, Pierron, G., additional, Delattre, O., additional, Ecker, J., additional, Oehme, I., additional, Mazitschek, R., additional, Lodrini, M., additional, Deubzer, H. E., additional, Kulozik, A. E., additional, Witt, O., additional, Milde, T., additional, Patmore, D., additional, Boulos, N., additional, Wright, K., additional, Boop, S., additional, Janicki, T., additional, Burzynski, S., additional, Burzynski, G., additional, Marszalek, A., additional, Triscott, J., additional, Green, M., additional, Rassekh, S. R., additional, Toyota, B., additional, Dunham, C., additional, Dunn, S. E., additional, Liu, K.-W., additional, Pei, Y., additional, Genovesi, L., additional, Ji, P., additional, Davis, M., additional, Ng, C. G., additional, Cho, Y.-J., additional, Jenkins, N., additional, Copeland, N., additional, Wainwright, B., additional, Tang, Y., additional, Schubert, S., additional, Nguyen, B., additional, Masoud, S., additional, Lee, A., additional, Willardson, M., additional, Bandopadhayay, P., additional, Bergthold, G., additional, Atwood, S., additional, Whitson, R., additional, Qi, J., additional, Beroukhim, R., additional, Tang, J., additional, Oro, A., additional, Link, B., additional, Bradner, J., additional, Vallero, S. G., additional, Bertin, D., additional, Basso, M. E., additional, Milanaccio, C., additional, Peretta, P., additional, Cama, A., additional, Mussano, A., additional, Barra, S., additional, Morana, G., additional, Morra, I., additional, Nozza, P., additional, Fagioli, F., additional, Garre, M. L., additional, Darabi, A., additional, Sanden, E., additional, Visse, E., additional, Stahl, N., additional, Siesjo, P., additional, Vaka, D., additional, Vasquez, F., additional, Weir, B., additional, Cowley, G., additional, Keller, C., additional, Hahn, W., additional, Gibbs, I. C., additional, Partap, S., additional, Yeom, K., additional, Martinez, M., additional, Vogel, H., additional, Donaldson, S. S., additional, Fisher, P., additional, Perreault, S., additional, Guerrini-Rousseau, L., additional, Pujet, S., additional, Kieffer-Renaux, V., additional, Raquin, M. A., additional, Varlet, P., additional, Longaud, A., additional, Sainte-Rose, C., additional, Valteau-Couanet, D., additional, Staal, J., additional, Lau, L. S., additional, Zhang, H., additional, Ingram, W. J., additional, Cho, Y. J., additional, Hathout, Y., additional, Brown, K., additional, Rood, B. R., additional, Handler, M., additional, Hankinson, T., additional, Kleinschmidt-Demasters, B. K., additional, Hutter, S., additional, Jones, D. T., additional, Kagawa, N., additional, Hirayama, R., additional, Kijima, N., additional, Chiba, Y., additional, Kinoshita, M., additional, Takano, K., additional, Eino, D., additional, Fukuya, S., additional, Yamamoto, F., additional, Nakanishi, K., additional, Hashimoto, N., additional, Hashii, Y., additional, Hara, J., additional, Yoshimine, T., additional, Wang, J., additional, Guo, C., additional, Yang, Q., additional, Chen, Z., additional, Filipek, I., additional, Swieszkowska, E., additional, Tarasinska, M., additional, Perek, D., additional, Kebudi, R., additional, Koc, B., additional, Gorgun, O., additional, Agaoglu, F. Y., additional, Wolff, J., additional, Darendeliler, E., additional, Kerl, K., additional, Gronych, J., additional, McGlade, J., additional, Endersby, R., additional, Hii, H., additional, Johns, T., additional, Sastry, J., additional, Murphy, D., additional, Ronghe, M., additional, Cunningham, C., additional, Cowie, F., additional, Jones, R., additional, Calisto, A., additional, Sangra, M., additional, Mathieson, C., additional, Brown, J., additional, Phuakpet, K., additional, Larouche, V., additional, Bartels, U., additional, Ishida, T., additional, Hasegawa, D., additional, Miyata, K., additional, Ochi, S., additional, Saito, A., additional, Kozaki, A., additional, Yanai, T., additional, Kawasaki, K., additional, Yamamoto, K., additional, Kawamura, A., additional, Nagashima, T., additional, Akasaka, Y., additional, Soejima, T., additional, Yoshida, M., additional, Kosaka, Y., additional, von Bueren, A., additional, Goschzik, T., additional, Kortmann, R., additional, von Hoff, K., additional, Friedrich, C., additional, Muehlen, A. z., additional, Warmuth-Metz, M., additional, Soerensen, N., additional, Deinlein, F., additional, Zwiener, I., additional, Faldum, A., additional, Kuehl, J., additional, KRAMER, K., additional, -Taskar, N. P., additional, Zanzonico, P., additional, Humm, J. L., additional, Wolden, S. L., additional, Cheung, N.-K. V., additional, Venkataraman, S., additional, Alimova, I., additional, Harris, P., additional, Birks, D., additional, Balakrishnan, I., additional, Griesinger, A., additional, Foreman, N. K., additional, Vibhakar, R., additional, Margol, A., additional, Robison, N., additional, Gnanachandran, J., additional, Hung, L., additional, Kennedy, R., additional, Vali, M., additional, Dhall, G., additional, Finlay, J., additional, Erdrich-Epstein, A., additional, Krieger, M., additional, Drissi, R., additional, Fouladi, M., additional, Gilles, F., additional, Judkins, A., additional, Sposto, R., additional, Asgharzadeh, S., additional, Peyrl, A., additional, Chocholous, M., additional, Holm, S., additional, Grillner, P., additional, Blomgren, K., additional, Azizi, A., additional, Czech, T., additional, Gustafsson, B., additional, Dieckmann, K., additional, Leiss, U., additional, Slavc, I., additional, Babelyan, S., additional, Dolgopolov, I., additional, Pimenov, R., additional, Mentkevich, G., additional, Gorelishev, S., additional, Laskov, M., additional, von Bueren, A. O., additional, Nowak, J., additional, Kortmann, R. D., additional, Mynarek, M., additional, Muller, K., additional, Gerber, N. U., additional, Ottensmeier, H., additional, Kwiecien, R., additional, Yankelevich, M., additional, Boyarshinov, V., additional, Glekov, I., additional, Ozerov, S., additional, Gorelyshev, S., additional, Popa, A., additional, Subbotina, N., additional, Martin, A. M., additional, Nirschl, C., additional, Polanczyk, M., additional, Bell, R., additional, Martinez, D., additional, Sullivan, L. M., additional, Santi, M., additional, Burger, P. C., additional, Taube, J. M., additional, Drake, C. G., additional, Pardoll, D. M., additional, Lim, M., additional, Li, L., additional, Wang, W.-G., additional, Pu, J.-X., additional, Sun, H.-D., additional, Ruggieri, R., additional, Symons, M. H., additional, Vanan, M. I., additional, Bolin, S., additional, Schumacher, S., additional, Zeid, R., additional, Yu, F., additional, Vue, N., additional, Gibson, W., additional, Paolella, B., additional, Swartling, F. J., additional, Kieran, M. W., additional, Bradner, J. E., additional, Maher, O., additional, Khatua, S., additional, Tarek, N., additional, Zaky, W., additional, Gupta, T., additional, Mohanty, S., additional, Kannan, S., additional, Jalali, R., additional, Kapitza, E., additional, Denkhaus, D., additional, Muhlen, A. z., additional, van Vuurden, D. G., additional, Garami, M., additional, Fangusaro, J., additional, Davidson, T. B., additional, da Costa, M. J. G., additional, Sterba, J., additional, Clifford, S. C., additional, Finlay, J. L., additional, Schmidt, R., additional, Felsberg, J., additional, Skladny, H., additional, Cremer, F., additional, Reifenberger, G., additional, Kunder, R., additional, Sridhar, E., additional, Moiyadi, A. A., additional, Goel, A., additional, Goel, N., additional, Shirsat, N., additional, Othman, R., additional, Storer, L., additional, Kerr, I., additional, Coyle, B., additional, Law, N., additional, Smith, M. L., additional, Greenberg, M., additional, Laughlin, S., additional, Malkin, D., additional, Liu, F., additional, Moxon-Emre, I., additional, Scantlebury, N., additional, Nasir, A., additional, Onion, D., additional, Lourdusamy, A., additional, Grabowska, A., additional, Cai, Y., additional, Bradshaw, T., additional, de Medeiros, R. S. S., additional, Beaugrand, A., additional, Soares, S., additional, Epelman, S., additional, Wang, W., additional, Sultan, M., additional, Wechsler-Reya, R. J., additional, Zapatka, M., additional, Radlwimmer, B., additional, Alderete, D., additional, Baroni, L., additional, Lubinieki, F., additional, Auad, F., additional, Gonzalez, M. 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Published
2014
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50. Structural phase transition, Néel temperature enhancement, and persistent magneto-dielectric coupling in Cr-substituted Mn3O4.

Author

Dwivedi, G. D., Kumar, Abhishek, Yang, K. S., Chen, B. Y., Liu, K. W., Chatterjee, Sandip, Yang, H. D., and Chou, H.

Subjects
PHASE transitions, SPINEL group, DIELECTRIC properties, MAGNETIC properties, X-ray absorption, JAHN-Teller effect
Abstract

Structural phase transition and Néel temperature (TN) enhancement were observed in Cr-substituted Mn3O4 spinels. Structural, magnetic, and dielectric properties of (Mn1-xCrx)3O4 (where x = 0.00, 0.10, 0.20, 0.25, 0.30, 0.40, and 0.50) were investigated. Cr-substitution induces room temperature structural phase transition from tetragonally distorted I41/amd (x = 0.00) to cubic Fd̄3m (x = 0.50). TN is found to increase from 43K (x = 0.00) to 58K (x = 0.50) with Cr-substitution. The spin ordering-induced dielectric anomaly near TN ensures that magneto-dielectric coupling persists in the cubic x = 0.50 system. X-ray absorption spectra reveal that Cr exists in a trivalent oxidation state and prefers the octahedral (Oh)-site, replacing Mn3+. Due to a reduction in the Jahn-Teller active Mn3+ cation and an increase in the smaller Cr3+ cation, the system begins to release the geometrical frustration by lowering its degeneracy. Consequently, a phase transition, from distorted tetragonal structure to the more symmetric cubic phase, occurs. [ABSTRACT FROM AUTHOR]

Published
2016
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