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Terahertz and infrared studies of antiferroelectric phase transition in multiferroic Bi.sub.0.85./sub.Nd.sub.0.15./sub.FeO.sub.3./sub..
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SYSNO ASEP 0367281 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Terahertz and infrared studies of antiferroelectric phase transition in multiferroic Bi0.85Nd0.15FeO3. Author(s) Goian, Veronica (FZU-D) RID, ORCID
Kamba, Stanislav (FZU-D) RID, ORCID, SAI
Greicius, S. (LT)
Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Karimi, S. (GB)
Reaney, I. M. (GB)Source Title Journal of Applied Physics. - : AIP Publishing - ISSN 0021-8979
Roč. 110, č. 7 (2011), 074112/1-074112/5Number of pages 5 s. Language eng - English Country US - United States Keywords multiferroics ; infrared and THz spectroscopy ; phonons ; antiferroelectrics Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GD202/09/H041 GA ČR - Czech Science Foundation (CSF) GA202/09/0682 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000295883000092 DOI 10.1063/1.3650241 Annotation High-frequency dielectric studies of Bi0.85Nd0.15FeO3 ceramics performed betweeen 100 and 900 K reveal hardening of most polar phonons on cooling below antiferroelectric phase transition, which occurs near 600 K. Moreover, a strong THz dielectric relaxation is seen in paraelectric phase. Its relaxation frequency softens on cooling towards TC = 600 K, its dielectric strength simultaneously decreases, and finally the relaxation disappears from the spectra below 450 K. Both phonon and dielectric relaxation behavior are responsible for a decrease in the dielectric permittivity at the antiferroelectric phase transition. Origin of unusual strong THz dielectric relaxation in paraelectric phase is discussed. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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