Etude structurale du conducteur anionique Bi0,765Sr0,235O1,383
Etude structurale du conducteur anionique Bi0,765Sr0,235O1,383
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阴离子导体结构练习曲 Bi0,765Sr0,235O1,383
DOI：
10.1016/0022-4596(80)90493-4
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发表时间：
1980
影响因子：
3.3
通讯作者：
Daniel Thomas
中科院分区：
文献类型：
--
作者：
P. Conflant;J. Boivin;Daniel Thomas
在空间群R3 m中，通过傅里叶综合和最小二乘修正，求解了氧导体的结构，即固溶体Bi 1− x Sr x O 1，5− x 2（x= 0.235，Z= 3）的菱面体（a= 9.75 °，α= 23.49°）低温形式。对强度数据进行吸收校正。对于302个独立平面，最终R值为0.030。大部分铋原子位于第一组上，具有扭曲的四面体配位，而剩余的铋和锶原子分布在具有八重（6+ 2）氧配位的单个位置上。两种类型的阴离子网站内检测到的阳离子片堆叠沿着[III]轴的四面体空隙。这导致层状结构，与松散结合的氧化物离子，提供了一个基础的相的离子电导率的解释。
The structure of an O 2− conductor, the rhombohedral (a= 9.75 Å, α= 23.49°) low-temperature form of the solid solution Bi 1− x Sr x O 1, 5− x 2 (x= 0.235, Z= 3) has been solved in space group R 3 m by means of Fourier synthesis and least-squares refinements. Intensity data were corrected for absorption. The final R value is 0.030 for 302 independent planes. Most of the bismuth atoms are located on a first set with a distorted tetrahedral coordination while the remaining bismuth and the strontium atoms are distributed on a single position with an eightfold (6+ 2) oxygen coordination. Two types of anionic sites are detected within the tetrahedral voids of the cation sheets stacked along the [III] axis. This results in a layered structure, with loosely bound oxide ions, providing a basis for the interpretation of the ionic conductivity of the phase.