双钙钛矿氧化物Sr_(2-x)□_xFeMoO_6的晶体结构

The crystal structure of double perovskite oxides Sr_(2-x)□_xFeMoO_6

采用传统高温固相反应法制备了空位掺杂的系列样品Sr2-x□xFeMoO6(0≤x≤0.04),详细研究了其晶体结构。X射线粉末衍射结果表明该系列样品均为四方晶系,空间群为I4/m。晶胞参数随掺杂量有明显的变化趋势。空位的含量调控反位缺陷的浓度,Fe/Mo有序度从未掺杂时的91.02%降低到x=0.04时的61.26%。由Rietveld精修得到该系列样品详细的布拉格衍射峰的峰位信息。

The series of Sr2-x□xFeMoO6（0≤x≤0.04） were prepared by standard solid-state reaction.The crystal structures for the ordered double perovskite oxides are investigated.The GSAS refinements of X-ray powder diffraction show that all the samples are single phase and have the I4/m symmetry.Crystal parameters of the series have obvious change with vacancy doping.The anti-site defect in Sr2FeMoO6 was 91.02% and decrease to 61.26% for Sr1.96□0.4FeMoO6.The Bragg diffraction peak information was obtained from the GSAS refinements of X-ray powder diffraction.