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 〉.
出处
《世界科技研究与发展》
CSCD
2010年第5期652-655,共4页
World Sci-Tech R&D
关键词
双钙钛矿
固相法
结构精修
掺杂
double-perovskite
solid state method
structural refinement
doping
