Structural and Surface Properties of Bi3(MSb2)O11(M= Al, Ga)
Structural and Surface Properties of Bi3(MSb2)O11(M= Al, Ga)
复制标题
DOI：
10.1006/jssc.1996.0374
复制
发表时间：
1996-12
影响因子：
5.4
通讯作者：
Ismunandar;B. Kennedy;B. Hunter
中科院分区：
文献类型：
--
作者：
Ismunandar;B. Kennedy;B. Hunter
用粉末中子和X射线同步辐射衍射数据的Rietveld型分析方法对两种氧化物Bi_3（MSb_2）O_（11）（M= Al，Ga）的结构进行了修正。这两种氧化物是同构的，空间群为Pn 3，a= 9.43323（4）A（M = Al），a = 9.48980（3）A（M = Ga），其中M和Sb原子统计分布在12 g位。该结构可以描述为两个互穿网络：一个是M2/3Sb 4/3 O 9共边八面体阵列，一个是Bi 2 O3共角四方体阵列。有两个独立的Bi位点，都具有扭曲的配位几何形状。这两种氧化物的表面组成基本上是相同的本体。与以前的研究表明，可能有一些耦合之间的Bi离子在这些氧化物的迁移率和它们的电子性质。
The structures of the two oxides Bi3(MSb2)O11(M= Al, Ga) have been refined by Rietveld-type analysis of combined powder neutron and X-ray synchrotron diffraction data. The two oxides are isostructural, space group Pn3,a= 9.43323(4) A forM= Al anda= 9.48980(3) A forM= Ga, in which theMand Sb atoms are statistically distributed in a 12gsite. The structures can be described as two interpenetrating networks: aM2/3Sb4/3O9array of edge-sharing octahedra and a Bi2O3array of corner-sharing Bi8O4stellae quadrangulae. There are two independent Bi sites, both having distorted coordination geometries. The surface composition of both oxides is essentially identical to that of the bulk. Comparison with previous studies suggests that there may be some coupling between the mobility of the Bi ions in these oxides and their electronic properties.