NDLI: Manifestation of a ferroelectric-antiferroelectric phase transition in Li$_{0.12}$Na$_{0.88}$Ta$_{0.4}$Nb$_{0.6}$O$

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Manifestation of a ferroelectric-antiferroelectric phase transition in Li$_{0.12}$Na$_{0.88}$Ta$_{0.4}$Nb$_{0.6}$O$_{3}$ in its Raman scattering spectra

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Optics and Spectroscopy : Volume 97, Issue 2, August 2004

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Manifestation of a ferroelectric-antiferroelectric phase transition in Li$_{0.12}$Na$_{0.88}$Ta$_{0.4}$Nb$_{0.6}$O$_{3}$ in its Raman scattering spectra

Content Provider	Springer Nature Link
Author	Sidorov, N. V. Palatnikov, M. N. Golubyatnik, N. A. Kalinnikov, V. T. Mavrin, B. N. Asov, V. V. Olekhvich, N. M. Radyush, Yu. V. Pushkarev, A. V.
Copyright Year	2004
Abstract	The ferroelectric-antiferroelectric phase transition in the Li$_{0.12}$Na$_{0.88}$Ta$_{0.4}$Nb$_{0.6}$O$_{3}$ ceramic solid solution has been studied by the Raman scattering technique. As the temperature approached the transition point from below, we observed an appreciable broadening of the lines associated with the vibrations of the cations occupying octahedral and cubooctahedral cavities of the structure and with the oxygen network vibrations (which implies a substantial increase in disorder on the cation sublattices), as well as a decrease to zero intensity of the 875-cm$^{−1}$ line corresponding to stretch vibrations of the bridging oxygen in the BO$_{6}$ octahedral anion in the vicinity of the transition. The temperature dependence of the 875-cm$_{−1}$ line intensity near the transition was used to study the behavior of the phase transition order parameter η. The behavior of η was found to disagree markedly with the Landau theory of second-order phase transitions. It is shown that discrepancies originate from the increase in disorder in the niobium and tantalum sublattices in the Li$_{0.12}$Na$_{0.88}$Ta$_{ y }$Nb$_{1-y }$O$_{3}$ solid solution system with increasing y. The order of the transition is lowered.
Starting Page	388
Ending Page	393
Page Count	6
File Format	PDF
ISSN	0030400X
Journal	Optics and Spectroscopy
Volume Number	97
Issue Number	3
e-ISSN	15626911
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2004-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical Spectroscopy, Ultrafast Optics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electronic, Optical and Magnetic Materials

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