Two high-temperature paraelectric phases in Sr0.85Bi2.1Ta2O9 -: art. no. 100102

被引：67

作者：

Hervoches, CH ^{[1
]}

Irvine, JTS ^{[1
]}

Lightfoot, P ^{[1
]}

机构：

[1] Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.64.100102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Sr0.85Bi2.1Ta2O9 is shown, by Rietveld refinement of powder neutron-diffraction data, to undergo two phase transitions at elevated temperature. The low-temperature ferroelectric phase (space group A2(1)am) transforms to a paraelectric phase (Amam) at T(c)similar to 375 degreesC. This phase does not transform to the expected tetragonal phase (I4/mmm) until T similar to 550 degreesC. The transition from A2(1)am to Amam involves not only loss of the displacive mode along the polar a axis, but also loss of a TaO6 octahedral tilt mode around the c axis.

引用

页数：4