Rietveld方法研究Bi_(1-x)Sm_xFeO_3晶体结构  

Rietveld refinement of Bi_(1-x)Sm_xFeO_3 crystal structure

作　　者：周广东[1] 朱克荣[1,2] 吴尝[1,3] 徐加荣[1] 

机构地区：[1]安徽大学物理与材料科学学院 [2]安徽大学现代实验技术中心,安徽合肥230039 [3]阜阳师范学院教务处,安徽阜阳236032

出　　处：《安徽大学学报（自然科学版）》2009年第2期61-65,共5页Journal of Anhui University(Natural Science Edition)

基　　金：安徽省教育厅自然科学基金资助项目(01010111)

摘　　要：采用溶胶-凝胶法成功制备Bi1-xSmxFeO3（BSFOx，x=0．000～0．175）粉体．测得BSFOx（x=0．000—0．175）样品的X射线衍射谱（XRD）．XRD结果显示Sm掺杂引起了晶格常数变化并最终导致结构相变．XRD的Rietveld全谱拟合结果表明x=0．000—0．125的BSFO，样品为三角相结构，且随着掺杂含量Sm的增加，晶格常数a、c线性减小；Sm掺杂量增加到x=0．150时，样品转变为正交相结构．Bi1-xSmxFeO3 （ BSFOx ,x = 0.000 - 0. 175 ） powders were prepared by sol-gol process. X-ray diffraction （XRD） patterns of the BSFOx （x =0. 000-0. 175） samples showed that the Sm doping causes lattice constant change as well as the structure transition. Rietveld refinement of the XRD patterns demonstrated that crystal structure of the BSFOx samples with x = 0.000 - 0. 125 was trigonal structure and lattice constant a, c decreased linearly with the increase of Sm concentration. When the Sm concentration increased to 0. 150, BSFOx structure transformed from trigonal into the orthorhombic.

关 键 词：BIFEO3 X射线衍射 Rietveld拟合 相变 

分 类 号：O723[理学—晶体学]