Vibrational spectroscopic study of ferroelectric SbNbO4, antiferroelectric BiNbO4, and their solid solutions

Ayyub, Pushan ; Multani, M. S. ; Palkar, V. R. ; Vijayaraghavan, R. (1986) Vibrational spectroscopic study of ferroelectric SbNbO4, antiferroelectric BiNbO4, and their solid solutions Physical Review B: Condensed Matter and Materials Physics, 34 (11). pp. 8137-8140. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v34/i11/p8137_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.34.8137

Abstract

Raman scattering and infrared absorption studies of ferroelectric SbNbO4, antiferroelectric BiNbO4, and the solid solution (Sb1-xBix)NbO4 for 0 < x < 1 in the range 20-1200 cm−1 are reported. These are the first vibrational spectroscopic investigations in these stibiotantalite-type systems. Symmetry assignments are proposed for the internal modes. Such an assignment is shown to lead to a consistent set of values for the local force constants calculated under the general quadratic valence force field. The nature of the variations of lattice and internal frequencies with changes in A3+-ion concentration is qualitatively discussed with particular reference to the ferroelectric soft mode.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:61610
Deposited On:15 Sep 2011 11:40
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