双钙钛矿Sr_2Mn_(1-x)Ga_xMoO_6(x=0.0～1.0)化合物的制备及其结构的研究  

Preparation and Structural Analysis of Double-Perovskite Compound Sr_2Mn_(1-x)Ga_3MoO_6(x=0.0～1.0)

作　　者：仝阳[1] 彭文彪[1] 秦刚[1] 郭光华[1] 

机构地区：[1]中南大学物理科学与技术学院

出　　处：《世界科技研究与发展》2010年第5期652-655,共4页World Sci-Tech R&D

摘　　要：采用固相反应法制备了双钙钛矿Sr_2Mn_(1-x)GaMoO_6(x=0.0～1.0)掺杂化合物。室温下的高分辨率X射线衍射分析表明,Sr_2MnMoO_6具有单斜晶体结构,空间群为P2_1/n。Ga的掺杂没有改变化合物的晶体结构,但衍射峰整体向高角度漂移。结构精修分析表明,Sr_2Mn_(1-x)Ga_xMoO_6样品的晶胞体积随Ga含量的增加而逐渐减小;B/B’位离子占位有序度伴随Ga的掺入而逐渐降低;此外,Ga的引入导致<B-O>键长的缩短,<B’-O>键长的伸长。The double-perovskite Sr2Mn1-xGaxMoO6（x = 0.0 - 1.0） compounds are prepared by solid state method. A room temperature a- nalysis of high-resolution X-ray powder diffraction patterns indicates that the structure of Sr2 MnMoO6 compound crystallize,which is in the monoclinic space group P2 t/n, does not change with the Ga doping, but the whole X-ray powder diffraction profiles shift to higher degree. The strnctural refinement has shown that the unit cell volume of Sr2Mn1-xGaxMoO6 compounds decrease with the Ga concentration; B/B＇ site cationic ordering decreases with Ga doping; the introduction of Ga leads to extension of bond 〈 B - O 〉 and shrinkage of bond 〈 B＇ -O 〉.

关 键 词：双钙钛矿 固相法 结构精修 掺杂 

分 类 号：O611.4[理学—无机化学]