Prog. Theor. Phys. Vol. 84 No. 1 (1990) pp. 32-35

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Letters

Theory of Ferroelectric Transition in K_1-xNa_xTaO₃

Chieko Totsuji and Takeo Matsubara

Department of Applied Physics, Okayama University of Science, Okayama 700

(Received April 16, 1990)

Abstract:

A possible explanation is given for the ferroelectricity in mixed crystals K_1-xNa_xTaO₃ for 0.05<x<0.72. In the mixed state the energy gap between valence and conduction bands becomes narrower due to disorderness. This gives rise to a phase transition through a large cancellation in the ferroelectric soft mode.

URL : http://ptp.ipap.jp/link?PTP/84/32/
DOI : 10.1143/PTP.84.32

References:

T. G. Davis, Phys. Rev. B5 (1972), 2530[APS].
D. Rytz, U. T. Höchli and H. Bilz, Phys. Rev. B22 (1980), 359[APS].
N. Kristoffel and P. Konsin, Ferroelectrics 6 (1973), 3.
A. Natori, J. Phys. Soc. Jpn. 40 (1976), 163[JPSJ]; ibid. 41 (1976), 782[JPSJ].
J. H. Barrett, Phys. Rev. 86 (1952), 118[APS].
G. A. Samara and B. Morosin, Phys. Rev. B8 (1973), 1256[APS].

Citing Article(s) :

Journal of the Physical Society of Japan 60 (1991) pp. 3549-3556 :
Stress Induced Ferroelectric Phase Transitionin Quantum-Paraelectrics

Chieko Totsuji and Takeo Matsubara
Journal of the Physical Society of Japan 61 (1992) pp. 1063-1068 :
Ferroelectric Phase Transition in Some Perovskite-Type Oxide Mixtures

Chieko Totsuji and Takeo Matsubara

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