MECHANISM OF THE FERROELASTIC TRANSITION OF BIVO4

被引:106
作者
PINCZUK, A [1 ]
WELBER, B [1 ]
DACOL, FH [1 ]
机构
[1] IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598
关键词
D O I
10.1016/0038-1098(79)90347-8
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
BiVO4 has a pure ferroelastic transition at Tc = 528°K and atmospheric pressure. We elucidated the mechanism of this transition by studying the q≈0 soft optical phonon, with the symmetry of the ferroelastic strain, under large hydrostatic prèssures at room temperature. A free-energy analysis, including the optical-acoustical phonon couplings, shows that the transition is driven by the q≈0 soft optical phonon. © 1978.
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页码:515 / 518
页数:4
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