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Phase Transitions
A Multinational Journal
Volume 20, 1990 - Issue 1-2
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Article

Structural phase transitions in KCdF3 and K0.5Rb0.5CdF3

M. Hidaka Department of Physics, Kyushu University, 33, Fukuoka, Japan
,
Z. Y. Zhou Department of Physics, Kyushu University, 33, Fukuoka, Japan
&
S. Yamashita Faculty of Education, Oita University, Oita, Japan
Pages 83-94 | Received 17 Mar 1989, Accepted 08 May 1989, Published online: 19 Aug 2006
 
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Abstract

Successive structural transitions of KCdF3 and K0.5Rb0.5CdF3 have been studied by means of thermal diffusivity, polarized light scattering and X-ray diffraction. It is found that transitions occur at about 460 K and 475 K in KCdF3, and at 222 K, 232 K, 250 K, 258 K and 268 K in K0.5Rb0.5CdF3. The partial exchange between K+ and Rb+ ions gives rise to simultaneous condensation of the Mz 3 and Rx 25 soft phonons.

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