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178 results on '"Malic, B."'

1. Domain wall-grain boundary interactions in polycrystalline Pb(Zr0.7Ti0.3)O3 piezoceramics

Author

Schultheiß, J., Checchia, S., Uršič, H., Frömling, T., Daniels, J. E., Malič, B., Rojac, T., and Koruza, J.

Subjects
Condensed Matter - Materials Science
Abstract

Interactions between grain boundaries and domain walls were extensively studied in ferroelectric films and bicrystals. This knowledge, however, has not been transferred to polycrystalline ceramics, in which the grain size represents a powerful tool to tailor the dielectric and electromechanical response. Here, we relate changes in dielectric and electromechanical properties of a bulk polycrystalline Pb(Zr0.7Ti0.3)O3 to domain wall interactions with grain boundaries. Samples with grain sizes in the range of 3.9 - 10.4 micrometers were prepared and their microstructure, crystal structure, and dielectric/electromechanical properties were investigated. A decreasing grain size was accompanied by a reduction in large-signal electromechanical properties and an increase in small-signal dielectric permittivity. High-energy diffraction analysis revealed increasing microstrains upon decreasing the grain size, while piezoresponse force microscopy indicated an increased local coercive voltage near grain boundaries. The changes in properties were thus related to strained material volume close to the grain boundaries exhibiting reduced domain wall dynamics., Comment: 27 pages, 7 figures

Published
2020

2. Broad-band dielectric response of BTZ-BCT piezoceramics: soft and central mode behaviour

Author

Kamba, S., Simon, E., Skoromets, V., Bovtun, V., Kempa, M., Pokorny, J., Savinov, M., Koruza, J., and Malic, B.

Subjects
Condensed Matter - Materials Science
Abstract

Dielectric properties of BTZ-BCT ceramics were probed in the frequency range from 10 Hz to 100 THz in a broad temperature range (10-900 K). Polar soft phonon observed in infrared spectra softens with cooling, however below 500 K its frequency becomes temperature independent. Simultaneously, a central mode activates in terahertz and microwave spectra; and it actually drives the ferroelectric phase transitions. Consequently, the phase transition strongly resemble a crossover between the dispacive and order-disorder type. The central mode vanishes below 200 K. The dielectric relaxation in the radiofrequency and microwave range anomalously broadens on cooling below T$_{C1}$ resulting in the nearly frequency independent dielectric loss bleow 200 K. This broadening comes from a broad frequency distribution of ferroelectric domain wall vibrations. Raman spectra reveal new phonons below 400 K, i.e. already 15 K above T$_{C1}$. Several weak modes are detected in the paraelectric phase up to 500 K in the Raman spectra. Activation of these modes is ascribed to the presence of polar nanoclusters in the material., Comment: accepted in Phase Transitions

Published
2016
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24. High-performance PMN-PT thick films

Author

Kosec, M., Ursic, H., Holc, J., Hrovat, M., Kuscer, D., and Malic, B.

Subjects
Aluminum oxide -- Electric properties, Aluminum oxide -- Thermal properties, Lead alloys -- Electric properties, Lead alloys -- Thermal properties, Scanning electron microscopes -- Usage, Sintering -- Usage, Titanium compounds -- Electric properties, Titanium compounds -- Thermal properties, Titanium compounds -- Structure, Zirconium -- Electric properties, Zirconium -- Thermal properties, Business, Electronics, Electronics and electrical industries
Published
2010

26. Dielectric relaxation and charged domain walls in (K,Na)NbO3-based ferroelectric ceramics.

Author

Esin, A. A., Alikin, D. O., Turygin, A. P., Abramov, A. S., Hreščak, J., Walker, J., Rojac, T., Bencan, A., Malic, B., Kholkin, A. L., and Shur, V. Ya.

Subjects
FERROELECTRIC materials, DIELECTRIC materials, CERAMICS, ELECTRIC field effects, ELECTROSTATICS
Abstract

The influence of domain walls on the macroscopic properties of ferroelectric materials is a well known phenomenon. Commonly, such "extrinsic" contributions to dielectric permittivity are discussed in terms of domain wall displacements under external electric field. In this work, we report on a possible contribution of charged domain walls to low frequency (10-106 Hz) dielectric permittivity in K1-xNaxNbO3 ferroelectric ceramics. It is shown that the effective dielectric response increases with increasing domain wall density. The effect has been attributed to the Maxwell-Wagner-Sillars relaxation. The obtained results may open up possibilities for domain wall engineering in various ferroelectric materials. [ABSTRACT FROM AUTHOR]

Published
2017
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27. Electrostrictive effect in lead-free relaxor K(sub 0.5)Na(sub 0.5)NbO3-SrTiO3 ceramic system

Author

Bobnar, V., Malic, B., Holc, J., Kosec, M., Steinhausen, R., and Beige, H.

Subjects
Titanates -- Electric properties, Niobium -- Electric properties, Sodium compounds -- Electric properties, Potassium compounds -- Electric properties, Physics
Abstract

The elastic strain of lead-free relaxor Ka(sub 0.5)Na(sub 0.5)NbO3-SrTiO3 ceramic system, induced by applied electric fields with amplitudes up to 40 kV/cm, is investigated. The electrostrictive coefficients are shown to be constant over a broad temperature range and similar to dielectric properties, independent of electric-field cycles, which suggest possible applications of this translucent, high-dielectric constant, and environmental-friendly ceramic system.

Published
2005

33. The Influence of the EVA Film Quality on the Degradation of PV Modules under Harsh Test Conditions

Author

Brecl, K., Bokalic, M., Barretta, C., Oreski, G., Malic, B., and Topic, M.

Subjects
PV Module Design, Manufacture, Performance and Reliability, Photovoltaic Modules and BoS Components
Abstract

35th European Photovoltaic Solar Energy Conference and Exhibition; 1277-1279, Photovoltaic modules are normally connected in series and therefore exposed to a high system voltage between the cells and the grounded frame. To study the potentially induced degradation, several in-house developed PV modules were exposed to a damp-heat test under RH 85% and temperature of 60 °C. The modules were assembled with EVA films of different ages and exposed to a high voltage bias of +1000 V. The PV modules with the aged EVA films exhibit very early and severe degradation of solar cells and a high degree of silver corrosion. A DSC analysis reveals a lower crosslinking degree of aged EVA films which leads into the peroxide leftovers that react with silver conduction lines.

Published
2018
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37. Extended x-ray absorption fine structure study of phase transitions in the piezoelectric perovskite K0.5Na0.5NbO3.

Author

Kodre, A., Tellier, J., Arcˇon, I., Malicˇ, B., and Kosec, M.

Subjects
EXTENDED X-ray absorption fine structure, PHASE transitions, PIEZOELECTRIC materials, PEROVSKITE, OXYGEN, X-ray diffraction
Abstract

Following an x-ray diffraction study of phase transitions of the piezoelectric perovskite K0.5Na0.5NbO3 the structural changes of the material are studied using extended x-ray absorption fine structure analysis, whereby the neighborhood of Nb atom is determined in the temperature range of monoclinic, tetragonal, and cubic phases. Within the entire range Nb atom is displaced from the center of the octahedron of its immediate oxygen neighbors, as witnessed by the splitting of Nb–O distance. The model shows high prevalence of the displacement in the (111) crystallographic direction of the simple perovskite cell. The corresponding splitting of the Nb–Nb distance is negligible. There is no observable disalignment of the linear Nb–O–Nb bonds from the ideal cubic arrangement, judging from the intensity of the focusing of the photoelectron wave on the Nb–Nb scattering path by the interposed oxygen atom. As a general result, the phase transitions are found as an effect of the long-range order, while the placement of the atoms in the immediate vicinity remains largely unaffected. [ABSTRACT FROM AUTHOR]

Published
2009
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39. Dielectric relaxation and charged domain walls in (K,Na)NbO3-based ferroelectric ceramics

Author

Alikin, D. O., Esin, A. A., Turygin, A. P., Abramov, A. S., Hrescak, J., Walker, J., Rojac, T., Bencan, A., Malic, B., Kholkin, A. L., Shur, V. Ya., Alikin, D. O., Esin, A. A., Turygin, A. P., Abramov, A. S., Hrescak, J., Walker, J., Rojac, T., Bencan, A., Malic, B., Kholkin, A. L., and Shur, V. Ya.

Abstract

We report on the evidence of significant contribution of charged domain walls to low frequency dielectric permittivity in KNN ferroelectric ceramics in the frequency range 10-106 Hz. The effect has been attributed to the Maxwell-Wagner-Sillars relaxation.

Published
2017

40. Dielectric Relaxation and Charged Domain Walls in (K,Na)NbO3-Based Ferroelectric Ceramics

Author

Esin, A. A., Alikin, D. O., Turygin, A. P., Abramov, A. S., Hreščak, J., Walker, J., Rojac, T., Bencan, A., Malic, B., Kholkin, A. L., Shur, V. Ya., Esin, A. A., Alikin, D. O., Turygin, A. P., Abramov, A. S., Hreščak, J., Walker, J., Rojac, T., Bencan, A., Malic, B., Kholkin, A. L., and Shur, V. Ya.

Abstract

The influence of domain walls on the macroscopic properties of ferroelectric materials is a well known phenomenon. Commonly, such “extrinsic” contributions to dielectric permittivity are discussed in terms of domain wall displacements under external electric field. In this work, we report on a possible contribution of charged domain walls to low frequency (10-106 Hz) dielectric permittivity in K1-xNaxNbO3 ferroelectric ceramics. It is shown that the effective dielectric response increases with increasing domain wall density. The effect has been attributed to the Maxwell-Wagner-Sillars relaxation. The obtained results may open up possibilities for domain wall engineering in various ferroelectric materials. © 2017 Author(s).

Published
2017

41. Local Domain Wall Structure in Polycrystalline BiFeO3

Author

Bencan, A., Drazic, G., Ursic, H., Sakamoto, N., Jancar, B., Wakiya, N., Suzuki, H., Malic, B., Damjanovic, D., Rojac, T., Bencan, A., Drazic, G., Ursic, H., Sakamoto, N., Jancar, B., Wakiya, N., Suzuki, H., Malic, B., Damjanovic, D., and Rojac, T.

Published
2017

43. Phase transitions of sodium niobate powder and ceramics, prepared by solid state synthesis

Author

Koruza, J., Tellier, J., Malic, B., Bobnar, V., and Kosec, M.

Subjects
Dielectric measurements -- Usage, Niobium -- Electric properties, Niobium -- Thermal properties, Phase transformations (Statistical physics) -- Analysis, Sodium compounds -- Electric properties, Sodium compounds -- Thermal properties, Sodium compounds -- Structure, Physics
Abstract

Phase transitions of sodium niobate, prepared by solid state synthesis method, are examined by using dielectric measurements in order to contribute to the clarification of its structural behavior below 400 [degree]C. The results have shown the existence of the Q polymorph at room temperature, which has undergone a transition to the R polymorph upon heating through a temperature region between 265 and 326.5 [degree]C.

Published
2010

44. Structural-disorder stability of mechanochemically derived Pb(Sc0.5Nb0.5)O3 ceramics

Author

Ursic, H., Bencan, A., Drazic, G., Esteves, G., Jones, J.L., Usher, T.M., Rojac, T., Deluca, M., Bobnar, V., Drnovsek, S., Trefalt, G., Jouin, Jenny, Malic, B., Elect Ceramics Department - slovenia, Jozef Stefan Institute [Ljubljana] (IJS), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), and DERORY, BEATRICE

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, [SPI.MAT] Engineering Sciences [physics]/Materials, ComputingMilieux_MISCELLANEOUS, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience

Published
2016

45. Local study of electric field induced phase transition anti-ferroelectric-ferroelectric in lead-free bismuth ferrite ceramics

Author

Abramov, A. S., Alikin, D. O., Turygin, A. P., Walker, J. B., Malic, B., Rojac, T., Kholkin, A. L., and Shur, V. Ya.

Abstract

The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used. The research was made possible in part by the Ministry of Education and Science of the Russian Federation (Contract 14.587.21.0022, UID RFMEFI58715X0022).

Published
2016

46. Extended x-ray absorption fine structure study of phase transitions in the piezoelectric perovskite [K.sub.0.5][Na.sub.0.5]Nb[O.sub.3]

Author

Kodre, A., Tellier, J., Arcon, I., Malic, B., and Kosec, M.

Subjects
Niobium -- Electric properties, Niobium -- Optical properties, Perovskite -- Structure, Perovskite -- Electric properties, Perovskite -- Optical properties, Phase transformations (Statistical physics) -- Analysis, Potassium -- Electric properties, Sodium -- Electric properties, X-rays -- Diffraction, X-rays -- Usage, Physics
Abstract

X-ray diffraction study followed by extended x-ray absorption fine structure analysis are applied to study the phase transition of the piezoelectric perovskite [K.sub.0.5][Na.sub.0.5]Nb[O.sub.3] the structural changes of the material. The phase transitions of the perovskite are found as an effect of the long-range order while the placement of the atoms in the immediate vicinity remains largely unaffected.

Published
2009

49. Self-Poling of BiFeO3 Thick Films.

Author

Khomyakova, E, Sadl, M, Ursic, H, Daniels, J, Malic, B, Bencan, A, Damjanovic, D, Rojac, T, Khomyakova, E, Sadl, M, Ursic, H, Daniels, J, Malic, B, Bencan, A, Damjanovic, D, and Rojac, T

Abstract

Bismuth ferrite (BiFeO3) is difficult to pole because of the combination of its high coercive field and high electrical conductivity. This problem is particularly pronounced in thick films. The poling, however, must be performed to achieve a large macroscopic piezoelectric response. This study presents evidence of a prominent and reproducible self-poling effect in few-tens-of-micrometer-thick BiFeO3 films. Direct and converse piezoelectric measurements confirmed that the as-sintered BiFeO3 thick films yield d33 values of up to ∼20 pC/N. It was observed that a significant self-poling effect only appears in cases when the films are heated and cooled through the ferroelectric-paraelectric phase transition (Curie temperature TC ∼ 820 °C). These self-poled films exhibit a microstructure with randomly oriented columnar grains. The presence of a compressive strain gradient across the film thickness cooled from above the TC was experimentally confirmed and is suggested to be responsible for the self-poling effect. Finally, the macroscopic d33 response of the self-poled BiFeO3 film was characterized as a function of the driving-field frequency and amplitude.

Published
2016

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