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THz and IR dielectric response of BaTiO.sub.3./sub. core-shell composites: evidence for interdiffusion
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SYSNO ASEP 0330281 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title THz and IR dielectric response of BaTiO3 core-shell composites: evidence for interdiffusion Title THz a IČ dielektrická odezva kompozitů BaTiO3 typu jádro - slupka: důkaz pro interdifuzi Author(s) Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Petzelt, Jan (FZU-D) RID, ORCID, SAI
Rychetský, Ivan (FZU-D) RID, ORCID
Buscaglia, V. (IT)
Buscaglia, M. T. (IT)
Nanni, P. (IT)Source Title Journal of Physics D-Applied Physics. - : Institute of Physics Publishing - ISSN 0022-3727
Roč. 42, č. 15 (2009), 155408/1-155408/15Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords THz and IR spectroscopy ; core-shell ; effective medium approximation ; dielectric response Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects KJB100100704 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000268042200036 DOI 10.1088/0022-3727/42/15/155408 Annotation Time-domain THz transmission and FTIR reflectivity spectra of dense core–shell composites of the BaZr0.2Ti0.8O3, BaZr0.4Ti0.6O3, Ba0.66Sr0.34TiO3 and Ba0.45Sr0.55TiO3 compositions were studied in a broad temperature range of 10-900 K. The spectra were evaluated to obtain the complex dielectric functions and at room temperature they were compared with the prediction of the generalized brick-wall model based on the effective medium approximation. The model was analysed concerning the dielectric losses and electric-field tunability below the polar phonon frequency range. Whereas the predicted losses are much reduced compared with those of the cores, the observed enhanced losses in the THz range give evidence of an interdiffusion of the BaTiO3 cores into the shells. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2010
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