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Grain-size effect in BaTiO.sub.3./sub. ceramics: study by far infrared spectroscopy
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SYSNO ASEP 0079393 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Grain-size effect in BaTiO3 ceramics: study by far infrared spectroscopy Title Efekt rozměru zrn v keramikách BaTiO3 : studium dalekou infračervenou spektroskopií Author(s) Ostapchuk, Tetyana (FZU-D) RID, ORCID
Petzelt, Jan (FZU-D) RID, ORCID, SAI
Savinov, Maxim (FZU-D) RID, ORCID
Buscaglia, V. (IT)
Mitoserius, L. (IT)Source Title Phase Transitions. - : Taylor & Francis - ISSN 0141-1594
Roč. 79, 6-7 (2006), s. 361-373Number of pages 13 s. Language eng - English Country GB - United Kingdom Keywords barium titanat ; nanocrystalline ceramics ; infrared reflectivity ; permittivity ; grain-size effect ; soft-mode Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GP202/06/P219 GA ČR - Czech Science Foundation (CSF) GA202/04/0993 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100520 - FZU-D (2005-2011) Annotation The article offers comparative study of two nanocrystalline (50 and 100 nm averaged grain size) and two coarse-grain (1.2 and 10 µm averaged grain size) ceramics by means of Fourier transform infrared spectroscopy in a broad temperature range (10-570 K). It appears that the stiffening and weakening of the overdamped soft mode is the only reason for the reduced dielectric permittivity of nanocrystalline ceramics in the paraelectric phase, but a strong grain-size dependence of the dielectric constant in the ferroelectric phase is not connected with with the changes in lattice dynamics Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2007
Number of the records: 1