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Properties of BaTiO.sub.3./sub. confined in nanoporous Vycor and artificial opal silica
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SYSNO ASEP 0350378 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Properties of BaTiO3 confined in nanoporous Vycor and artificial opal silica Author(s) Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Vaněk, Přemysl (FZU-D) RID, ORCID
Petzelt, Jan (FZU-D) RID, ORCID, SAI
Bovtun, Viktor (FZU-D) RID, ORCID, SAI
Kempa, Martin (FZU-D) RID, ORCID
Gregora, Ivan (FZU-D) RID, ORCID
Savinov, Maxim (FZU-D) RID, ORCID
Krupková, Radmila (FZU-D) RID
Studnička, Václav (FZU-D) RID
Buršík, Josef (UACH-T) RID, ORCID, SAI
Samoylovich, M.I. (RU)
Schranz, W. (AT)Source Title Processing and Application of Ceramics - ISSN 1820-6131
Roč. 4, č. 3 (2010), s. 215-223Number of pages 9 s. Language eng - English Country CS - CS Keywords nanocomposite ; confined BaTiO3 ; porous silica ; stiffened soft mode ; effective dielectric properties Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects KAN301370701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z10100520 - FZU-D (2005-2011) AV0Z40320502 - UACH-T (2005-2011) Annotation Using the sol-gel technique, BaTiO3 was embedded into nanoporous Vycor and artificial vitreous opal silica for the first time. About 50 vol% of the pores was filled. In case of the Vycor glass only amorphous phase was revealed by XRD, IR reflectivity and Raman spectra. The RT infrared and Raman spectra clearly show characteristic vibrational modes of the ferroelectrically distorted TiO6 octahedra without any long-range order. In case of the opal matrix, crystallization of the ferroelectric BaTiO3 appeared in coexistence with the amorphous phase, but the penetration depth of the crystalline BaTiO3 was limited. From the apparent temperature independence of the effective wide-frequency dielectric response, we can deduce that no macroscopic percolation of the crystalline BaTiO3 has appeared in our opal matrix. Nevertheless, Raman spectra bring evidence of a diffuse ferroelectric phase transition in the opal-BaTiO3 composite. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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