Crystal structure of (Sr, Ba)Bi2Ta2O9
Crystal structure of (Sr, Ba)Bi2Ta2O9
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(Sr, Ba)Bi2Ta2O9 的晶体结构
DOI：
10.1016/0025-5408(73)90156-6
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发表时间：
1973
影响因子：
5.4
通讯作者：
M. Kay
中科院分区：
文献类型：
--
作者：
R. Newnham;R. W. Wolfe;R. Horsey;F. A. Diaz;M. Kay
（Sr0.9Ba0.1）Bi 2 Ta 2 O 9的晶体结构已被精炼，以阐明在钛酸铋家族的均匀层状成员中观察到的较低相变的性质。最小二乘法分析的基础上，X射线和中子衍射强度导致的R-因子为0.13的1135反射。钽酸铋锶钡是斜方晶系，空间群A2 1 am，其中a= 5.504，B= 5.488，c= 25.06 A/cm，并且Z= 4。在较低的过渡附近，五个短的Bi-O键保留在氧化铋层中，但钙钛矿中的扭曲大大减少，Ta离子从八面体中心位移仅0.05 μ m。
The crystal structure of (Sr 0.9 Ba 0.1) Bi 2 Ta 2 O 9 has been refined to elucidate the nature of the lower phase transition observed in even-layered members of the bismuth titanate family. Least squares analysis based on x-ray and neutron diffraction intensities led to an R-factor of 0.13 for 1135 reflections. Bismuth strontium barium tantalate is orthorhombic, space group A2 1 am, with a= 5.504, b= 5.488, c= 25.06 A ̊, and Z= 4. Near the lower transition, five short Bi-O bonds are retained in the bismuth oxide layer, but distortions in the perovskite are reduced considerably, with the Ta ion displaced just 0.05 Å from the center of the octahedron.