Nondegenerate hard-mode Raman studies of phase transition in antiferroelectric lead ytterbium niobate-based perovskite compound

Autor:	Woong-Kil Choo, Jong-Jean Kim, Sang-Jin Ahn, Jai-Hyun Kim
Rok vydání:	2006
Předmět:	Ytterbium Quantum phase transition Phase transition Condensed matter physics Chemistry Phase (matter) chemistry.chemical_element Antiferroelectricity General Materials Science Dielectric Ferroelectricity Spectroscopy Perovskite (structure)
Zdroj:	Journal of Raman Spectroscopy. 37:202-207
ISSN:	1097-4555 0377-0486
DOI:	10.1002/jrs.1481
Popis:	By using Slater's phenomenological theory of atomic lattice dynamics, general results for the nondegenerate hard mode of phase transition are rederived in a simpler form. The change in inverse dielectric susceptibility (χ−1) associated with the phase transition is related to the hard-mode frequency shift (ωQ) as , where the proportionality constant R can be determined from the experimental data. This relation between the changes in χ−1 and was verified for the antiferroelectric phase transition observed in 0.94PYN [Pb(Yb1/2Nb1/2)O3]–0.06PT[PbTiO3], with the proportionality constant R as −1.6 × 10−7 cm2 in the antiferroelectric phase. Copyright © 2006 John Wiley & Sons, Ltd.
Databáze:	OpenAIRE
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