Search

Your search keyword '"P.Y. Zeng"' showing total 8 results
Start Over Author "P.Y. Zeng"
8 results on '"P.Y. Zeng"'

1. Phase transition induced morphotropic phase boundary behavior and the electric properties in strontium modulated Bi4.5Na0.5Ti4O15 lead-free ceramics

Author

G.B. Yu, M.W. Yao, C.M. Zhu, L.G. Wang, and P.Y. Zeng

Subjects
010302 applied physics, Strontium, Phase boundary, Phase transition, Materials science, Condensed matter physics, Process Chemistry and Technology, chemistry.chemical_element, 02 engineering and technology, Dielectric, 021001 nanoscience & nanotechnology, 01 natural sciences, Ferroelectricity, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Tetragonal crystal system, chemistry, Phase (matter), 0103 physical sciences, Materials Chemistry, Ceramics and Composites, Curie temperature, 0210 nano-technology
Abstract

Lead-free (Bi0.5Na0.5)1-xSrxBi4Ti4O15 ceramics (x = 0–0.9) are fabricated by solid state reaction process. XRD analysis shows the symmetry divergence from tetragonal to orthorhombic phase accompanied by morphotropic phase boundary with increasing strontium content. Raman spectra confirm the incorporation of strontium into (Bi2.5Na0.5Ti4O13)2- layers. SEM graphs exhibit the typical plate-like morphology with regular variation of grain size and crystallization as strontium increases. Multistage ferroelectric transition is observed with x = 0.2–0.4. Piezoelectric performance measurements present the well thermal stability at x = 0.4. The dielectric properties display a shifting of Curie temperature towards low temperature with increasing strontium ions. It can be due to the crystal lattice distortion by larger radius of strontium and the increasing tolerance factor. ac conductivity and impedance measurements suggest that electron hopping mainly contributes to the low temperature region. Ionization conductivity by oxygen vacancy migration including first-ionization and double-ionization plays the dominating role in the middle and high temperature region. The controllable properties indicate the potential applications for electric devices of (Bi0.5Na0.5)1-xSrxBi4Ti4O15 ceramic.

Published
2021
Full Text
View/download PDF

2. Relaxor dielectric properties of lead-free Bi4Ti3O12/Bi4.5Na0.5Ti4O15 intergrowth ceramics

Author

Wenjie Kong, G.B. Yu, Fuchi Liu, Z.H. Huang, P.Y. Zeng, Fengzhen Lv, C.M. Zhu, L.G. Wang, and Y.T. Zhao

Subjects
010302 applied physics, Arrhenius equation, Materials science, Condensed matter physics, Process Chemistry and Technology, 02 engineering and technology, Dielectric, Activation energy, 021001 nanoscience & nanotechnology, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Dielectric spectroscopy, symbols.namesake, visual_art, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, symbols, visual_art.visual_art_medium, Relaxation (physics), Grain boundary, Ceramic, Nyquist plot, 0210 nano-technology
Abstract

Intergrowth ceramic series Bi4Ti3O12/Bi4.5Na0.5Ti4O15 have been prepared through solid state reaction. X-ray diffraction analysis shows the coexistence of Bi4Ti3O12 and Bi4.5Na0.5Ti4O15 phases with slight lattice distortion. Scanning electron micrographs present the growth of grains and grain boundaries with different contents of Bi4.5Na0.5Ti4O15. The relaxation dielectric properties of the ceramics have been observed. The room-temperature dielectric constant at 100 Hz is initially increased and then decreased with the increase of Bi4.5Na0.5Ti4O15. The impedance spectroscopy and the electrical modulus are also measured for explaining the dielectric behavior. The Nyquist plots display different semicircle arcs at 300 and 600 K. The imaginary part of electrical modulus has two peaks in the range of the measuring temperature. They prove the common influence of grains and grain boundaries on the dielectric properties. For further fitting the experimental data by Arrhenius theory, activation energy is obtained for grains and grain boundaries. Finally, the relaxor dielectric properties are attributed to the competition mechanism from the different growth situation of grains and grain boundaries with increasing Bi4.5Na0.5Ti4O15. Therefore, this kind of ceramics ought to be promising candidates for multifunctional device applications.

Published
2020
Full Text
View/download PDF

3. The regulation of magnetic and dielectric behaviors in lead-free (1-x)(0.75Bi4Ti3O12-0.25Bi0.5Na0.5TiO3)-xMgFe2O4 composites

Author

P.Y. Zeng, Q. Huang, Z.H. Huang, M.W. Yao, Y.T. Zhao, C.M. Zhu, L.G. Wang, and G.B. Yu

Subjects
Permittivity, Materials science, Relaxation (NMR), 02 engineering and technology, Dielectric, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Microstructure, 01 natural sciences, Grain size, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Inorganic Chemistry, symbols.namesake, Materials Chemistry, Ceramics and Composites, symbols, Crystallite, Physical and Theoretical Chemistry, Composite material, 0210 nano-technology, Raman spectroscopy, Stoichiometry
Abstract

Polycrystalline (1-x)(0.75Bi4Ti3O12-0.25Bi0.5Na0.5TiO3)-xMgFe2O4 lead-free composites were prepared through sol-gel process with different stoichiometric proportions. The influence of proportions on microstructure, morphology, magnetic and dielectric behaviors has been explored detailedly. XRD patterns and Raman measurement reveal the multiphase coexistence with increasing content of MgFe2O4 of all the samples. The surface morphology presents different distributions of grain size for different proportions. The average grain size is confirmed to decrease as the MgFe2O4 concentration increases. Room-temperature magnetic properties are evidently enhanced by increasing addition of MgFe2O4. The giant effective permittivity at room temperature is obtained for all the samples with order of magnitude of 104∼105. The variation of dielectric properties including effective permittivity and dielectric relaxation is strongly dependent on the content of MgFe2O4. Through rigorous analysis, the dielectric behavior should result from the common contributions of different conductivities and morphology variation due to the incorporation of MgFe2O4 to Bi4Ti3O12-Bi0.5Na0.5TiO3.

Published
2021
Full Text
View/download PDF

4. Applications and processing of SiGe and SiGe:C for high-speed HBT devices

Author

P.Y. Zeng, D.A. Webb, D.J. Meyer, M.G. Ward, J. Robinson, and J.D. Sellar

Subjects
Fabrication, Materials science, business.industry, Mechanical Engineering, Heterojunction bipolar transistor, Doping, Bipolar junction transistor, Hardware_PERFORMANCEANDRELIABILITY, Semiconductor device, BiCMOS, Condensed Matter Physics, Epitaxy, Mechanics of Materials, Hardware_INTEGRATEDCIRCUITS, Optoelectronics, General Materials Science, business, Data transmission
Abstract

The continued growth of high-speed-digital data transmission and wireless communications technology has motivated increased integration levels for ICs serving these markets. Further, the increasing use of portable wireless communications tools requiring long battery lifetimes necessitates low power consumption by the semiconductor devices within these tools. The SiGe and SiGe:C materials systems provide solutions to both of these market needs in that they are fully monolithically integratible with Si BiCMOS technology. Also, the use of SiGe or SiGe:C HBTs for the high-frequency bipolar elements in the BiCMOS circuits results in greatly decreased power consumption when compared to Si BJT devices. Either a DFT (graded Ge content across the base) or a true HBT (constant Ge content across the base) bipolar transistor can be fabricated using SiGe or SiGe:C. Historically, the graded profile has been favored in the industry since the average Ge content in the pseudomorphic base is less than that of a true HBT and, therefore, the DFT is tolerant of higher thermal budget processing after deposition of the base. The inclusion of small amounts of C (e.g.

Published
2001
Full Text
View/download PDF

5. Contents Vol. 87, 1999

Author

Y.K. Kwon, R. Taneja, C.L. Keck-Waggoner, X. Estivill, Z.G. Xue, G. Vassart, R. Langley, D.K. Griffin, O. Delattre, Q. Tu, V. Pecile, J.M. Vance, K. Hoehn, S. Zhao, N. Wang, K. Agata, Y. Baba, Y.H. Chen, E. Leung, J. Walker, P. Parham, T. Yamadori, L.K. Goff, F. Haberman, L.A. Shepel, O. Rosnet, M.A. Crackower, P.G. Suh, M. Nessling, C.R. Bonvicino, R. Kreutz, P. Castagnola, F. Ventura, J.L. Rosa, B. Malfoy, S. Armstrong, M.N. Gould, K. Sano, S.-X. Wang, M. Mori, C. Larsson, S. van Soest, R. Morello, G.M. Brasic, F. Farnebo, L. Yu, J.R. Lee, H. Nakamura, S. Kytölä, C. Bourgeois, T. Kishimoto, B.-Z. Yuan, E.M. Hammond, A. Bernheim, Y. Matsuda, M. Schmid, P. van Vooren, T. van Reeth, D. Schadendorf, U.S.R. Bergerheim, R.J.A. Grand, S.Y. Zhao, Kazuhiko Orikasa, F.A. Norris, T. Kurosaki, F. Bussolino, H. Coffigny, D.B. Zimonjic, M. Matsushita, N. Horelli-Kuitunen, H. Zhang, Z.C. Yin, N. Kansaku, J. Justesen, S.H. Park, R. Leach, M. Bagga, Y. Zhao, A. Vilain, T. Suzuki, K. Hildén, F. Tian, Z.C. Chen, R. Sallinen, R. Bartrons, K. Lehnert, M. Ricoul, M.D.A. Kuske, C. Cruz, A. Amoroso, D.S. Sinasac, C.J. Ye, P.C.L. Beverley, J. Bernardino, M. Koide, J.-H. Piao, Z. Guillier-Gencik, Johji Inazawa, L. Tonachini, J. Aaltonen, K.-S. Chen, S. Crovella, R.E. Pearlman, A. Bensimon, J.H. Xia, A. Maho, Shinichi Fukushige, H. Zürcher, A. Palotie, Takushi Monden, J. Skaug, Q. Liu, H.N. Seuánez, S.P. Stoesz, M.A.M. Moreira, J. Isola, J.Y. Chu, F.C. Canavez, S.A. Krawetz, Akira Horii, T. Visakorpi, H.H.Q. Heng, M. Ferguson-Smith, Y. Yang, J. Smith, C.G. Jakobsen, M. Ko, L.-C. Tsui, M. Wessman, D.W. Burt, Y.K. Jung, P.B. Moens, N. Nupponen, Ph. Coullin, J. Springer, N. Spieker, J.-A. Herbrick, J. Masabanda, T. Satoh, O. Ritvos, J. Bondestam, P. Stanier, I. Nanda, J.P. Johnson, M. Nadal, A. Sazanov, S. Hashimoto, C.M. Morris, L.L. Hansen, T. Namikawa, A. Niveleau, P. Lichter, P.Y. Zeng, H. Sun, P.S. White, M. Paul, W.O. Lui, R.E. Joseph, K. Shimada, D. Liu, R. Cancedda, J. Ni, G.W. Krissansen, S.H. Ryu, S.W. Scherer, M. Timón, N.C. Popescu, M. Monticone, C. Jiang, B. Dutrillaux, J. Wienberg, S.S. Thorgeirsson, E. Audero, M.A. Kern, M.Z. Li, J. Szpirer, F. Grummt, B.C. Schutte, K. Schmeiser, Seiichi Orikasa, C. Schiff, C. Szpirer, Y. Pan, Takashi Yamato, M. Yamada, M. Tarsounas, S. Garagna, A. Forus, N. Marziliano, M-G. Mattéi, S. Tsukada, W. Kuang, E. Tchilian, P. O’Brien, S.G. Gregory, S. Gough, H. Kim, Q. Pan, M. Parmentier, E. Engvall, and T.C. Matise

Subjects
Botany, Genetics, Biology, Molecular Biology, Genetics (clinical)
Published
1999
Full Text
View/download PDF

6. Reassignment of EST w23312 to human chromosome 2q35--q37 by fluorescence in situ hybridization

Author

F. Tian, Y.H. Chen, Z.G. Xue, Z.C. Chen, J.H. Xia, P.Y. Zeng, Z.C. Yin, and Q. Pan

Subjects
Genetics, Expressed Sequence Tags, Expressed sequence tag, medicine.diagnostic_test, Base Sequence, Molecular Sequence Data, Reproducibility of Results, Nasopharyngeal Neoplasms, Biology, Physical Chromosome Mapping, Chromosome (genetic algorithm), Gene mapping, Chromosomes, Human, Pair 2, medicine, Humans, Chromosomes, Human, Pair 3, Cloning, Molecular, Artifacts, Molecular Biology, Chromosomes, Artificial, Yeast, Genetics (clinical), In Situ Hybridization, Fluorescence, Fluorescence in situ hybridization
Published
2000

7. Subject Index Vol. 87, 1999

Author

Y. Baba, A. Maho, M.A.M. Moreira, P. van Vooren, T. van Reeth, M.A. Crackower, D. Schadendorf, Q. Liu, M. Mori, A. Niveleau, H. Sun, S.H. Ryu, P.C.L. Beverley, C. Larsson, S. van Soest, M. Tarsounas, Y. Matsuda, M. Schmid, Y.K. Kwon, O. Ritvos, S. Garagna, L.K. Goff, S. Armstrong, S.-X. Wang, X. Estivill, M.Z. Li, F. Haberman, S.G. Gregory, W.O. Lui, C. Szpirer, G.M. Brasic, J. Justesen, A. Bensimon, F.A. Norris, C. Schiff, A. Palotie, G. Vassart, C.R. Bonvicino, R. Kreutz, J. Szpirer, F. Farnebo, S. Gough, M.N. Gould, F. Bussolino, N. Kansaku, Shinichi Fukushige, F. Grummt, H. Kim, J.P. Johnson, E.M. Hammond, L. Tonachini, J.H. Xia, J.M. Vance, R. Bartrons, S.H. Park, K. Lehnert, R. Taneja, J. Walker, P. Parham, Q. Pan, Y.K. Jung, O. Rosnet, Y. Pan, D.S. Sinasac, A. Amoroso, N. Nupponen, O. Delattre, B. Malfoy, J. Smith, K. Hildén, P.Y. Zeng, T. Kurosaki, Y. Yang, M. Nadal, M. Koide, J. Masabanda, K. Hoehn, R. Sallinen, J. Skaug, I. Nanda, A. Sazanov, C.M. Morris, S. Tsukada, L.L. Hansen, N.C. Popescu, A. Forus, H. Nakamura, A. Vilain, M. Wessman, H.H.Q. Heng, N. Marziliano, F. Tian, W. Kuang, Z. Guillier-Gencik, Johji Inazawa, Takashi Yamato, R.E. Pearlman, T. Namikawa, P. Lichter, J.-H. Piao, T. Satoh, N. Horelli-Kuitunen, Y.H. Chen, E. Leung, K.-S. Chen, J. Springer, B.C. Schutte, E. Tchilian, P. O’Brien, P.S. White, M. Paul, M. Bagga, Q. Tu, J.-A. Herbrick, S. Zhao, L.A. Shepel, K. Schmeiser, J. Wienberg, Y. Zhao, R. Morello, F. Ventura, L. Yu, T. Kishimoto, A. Bernheim, S.S. Thorgeirsson, S. Kytölä, C. Cruz, M. Parmentier, S.A. Krawetz, J. Bernardino, Akira Horii, M. Yamada, E. Engvall, J.L. Rosa, Kazuhiko Orikasa, S. Crovella, C. Jiang, B. Dutrillaux, H. Zürcher, S. Hashimoto, T.C. Matise, S.W. Scherer, T. Visakorpi, M. Ferguson-Smith, Z.C. Chen, C.J. Ye, Seiichi Orikasa, Z.C. Yin, C.G. Jakobsen, H.N. Seuánez, P. Castagnola, M. Timón, D. Liu, J. Aaltonen, R. Cancedda, M.A. Kern, F.C. Canavez, R.E. Joseph, K. Shimada, G.W. Krissansen, P.B. Moens, U.S.R. Bergerheim, M. Monticone, T. Suzuki, E. Audero, T. Yamadori, J. Ni, C. Bourgeois, Ph. Coullin, M. Nessling, M-G. Mattéi, M. Ko, L.-C. Tsui, R. Langley, J. Isola, V. Pecile, K. Sano, J. Bondestam, P. Stanier, B.-Z. Yuan, D.B. Zimonjic, M. Matsushita, S.Y. Zhao, N. Wang, H. Zhang, R. Leach, M. Ricoul, M.D.A. Kuske, S.P. Stoesz, C.L. Keck-Waggoner, Z.G. Xue, N. Spieker, J.R. Lee, R.J.A. Grand, H. Coffigny, D.K. Griffin, P.G. Suh, K. Agata, Takushi Monden, J.Y. Chu, and D.W. Burt

Subjects
Genetics, Index (economics), Subject (documents), Biology, Social science, Molecular Biology, Genetics (clinical)
Published
1999
Full Text
View/download PDF

8. Revised guidelines for authors of gene mapping reports

Author

L.A. Shepel, F. Ventura, G.M. Brasic, J.L. Rosa, R. Taneja, F. Farnebo, E.M. Hammond, T. Kurosaki, L. Tonachini, Q. Tu, F.A. Norris, J.R. Lee, S. Zhao, O. Delattre, J. Skaug, K. Hoehn, N. Wang, S.A. Krawetz, Y.H. Chen, J. Justesen, E. Leung, Akira Horii, R. Sallinen, R.J.A. Grand, C.G. Jakobsen, J.-H. Piao, J. Smith, S. Armstrong, S.-X. Wang, M. Wessman, P. Castagnola, J. Springer, H. Coffigny, S.H. Park, M. Bagga, Y. Zhao, J.-A. Herbrick, T. Suzuki, L. Yu, B. Malfoy, L.K. Goff, Z.C. Chen, B.-Z. Yuan, T. Kishimoto, K. Hildén, A. Bernheim, O. Rosnet, J. Aaltonen, S.Y. Zhao, C. Cruz, H. Zhang, R. Morello, Kazuhiko Orikasa, Z. Guillier-Gencik, C. Bourgeois, H. Nakamura, Johji Inazawa, J. Isola, K.-S. Chen, J. Bernardino, P.G. Suh, F. Haberman, K. Schmeiser, U.S.R. Bergerheim, Z.C. Yin, S. Crovella, H. Zürcher, Takushi Monden, S. Kytölä, M.A. Crackower, M. Mori, C. Larsson, S. van Soest, Y. Matsuda, M. Schmid, Y.K. Jung, C.R. Bonvicino, J.Y. Chu, N. Nupponen, Y. Baba, A. Niveleau, H.H.Q. Heng, H. Sun, J. Masabanda, R. Kreutz, M.N. Gould, I. Nanda, A. Sazanov, S.H. Ryu, Q. Liu, D.W. Burt, D.K. Griffin, R. Langley, B.C. Schutte, V. Pecile, D.S. Sinasac, D.B. Zimonjic, M. Matsushita, R. Leach, M. Ricoul, M.D.A. Kuske, A. Vilain, M.Z. Li, F. Tian, Seiichi Orikasa, S. Hashimoto, O. Ritvos, A. Maho, J. Szpirer, F. Grummt, R.E. Joseph, M.A.M. Moreira, W.O. Lui, K. Shimada, G.W. Krissansen, R. Bartrons, J. Walker, K. Lehnert, A. Amoroso, P. Parham, P. van Vooren, T. van Reeth, D. Schadendorf, C. Jiang, B. Dutrillaux, N.C. Popescu, P.C.L. Beverley, A. Bensimon, J. Wienberg, S.S. Thorgeirsson, M.A. Kern, J.H. Xia, M-G. Mattéi, M. Tarsounas, S. Garagna, H.N. Seuánez, S.G. Gregory, A. Forus, N. Marziliano, S. Gough, H. Kim, F.C. Canavez, Q. Pan, C. Schiff, C.L. Keck-Waggoner, M. Parmentier, Z.G. Xue, Shinichi Fukushige, Y. Yang, E. Engvall, M. Ko, L.-C. Tsui, T.C. Matise, J.P. Johnson, M. Nadal, C.M. Morris, L.L. Hansen, T. Satoh, T. Namikawa, P. Lichter, P.Y. Zeng, P.S. White, S. Tsukada, W. Kuang, M. Paul, E. Tchilian, Takashi Yamato, P. O’Brien, D. Liu, S.W. Scherer, M. Yamada, M. Timón, R. Cancedda, C. Szpirer, T. Visakorpi, J. Ni, M. Ferguson-Smith, M. Monticone, Y. Pan, E. Audero, F. Bussolino, P.B. Moens, N. Kansaku, Ph. Coullin, J. Bondestam, P. Stanier, N. Horelli-Kuitunen, C.J. Ye, M. Koide, T. Yamadori, M. Nessling, S.P. Stoesz, R.E. Pearlman, K. Sano, A. Palotie, N. Spieker, K. Agata, Y.K. Kwon, X. Estivill, G. Vassart, and J.M. Vance

Subjects
Gene mapping, Evolutionary biology, Genetics, Biology, Molecular Biology, Genetics (clinical)
Published
1999
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results