Premium
Nondegenerate hard‐mode Raman studies of phase transition in antiferroelectric lead ytterbium niobate‐based perovskite compound
Author(s) -
Ahn SangJin,
Kim JongJean,
Kim JaiHyun,
Choo WoongKil
Publication year - 2006
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1481
Subject(s) - antiferroelectricity , raman spectroscopy , omega , phase transition , ytterbium , dielectric , condensed matter physics , physics , ferroelectricity , inverse , quantum mechanics , doping , mathematics , geometry
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 (ω Q ) as ${\Delta}(\chi^{-1}) = R\omega_{\rm Q}^{2}$ , where the proportionality constant R can be determined from the experimental data. This relation ${\Delta}(\chi^{-1}) = R\omega_{\rm Q}^{2}$ between the changes in χ −1 and $\omega_{\rm Q}^{2}$ was verified for the antiferroelectric phase transition observed in 0.94PYN [Pb(Yb 1/2 Nb 1/2 )O 3 ]–0.06PT[PbTiO 3 ], with the proportionality constant R as −1.6 × 10 −7 cm 2 in the antiferroelectric phase. Copyright © 2006 John Wiley & Sons, Ltd.