用X-射线衍法研究Sm_2Zr_2O_7形成机制  

Analysis of Sm_2Zr_2O_7 Forming Mechanism by X-Ray Diffraction

作　　者：张红松[1] 王富耻[2] 徐强[2] 刘玲[2] 

机构地区：[1]河南纺织高等专科学校,河南郑州450007 [2]北京理工大学材料科学与工程学院,北京100081

出　　处：《稀有金属材料与工程》2007年第A02期533-536,共4页Rare Metal Materials and Engineering

基　　金：清华大学新型陶瓷与精细工艺国家重点实验室开放课题(2005年度);总装备部预研基金项目(9140A12020306BQ0102)资助;北京理工大学优秀青年教师资助计划(2006Y0409)

摘　　要：采用XRD技术研究了固相反应制备Sm_2Zr_2O_7的形成机制。结果表明:从1000℃开始,Sm^(3+)逐渐取代Zr^(4+)的位置,形成萤石结构ZrO_2-Sm_2O_3固溶体,该过程直到1400℃才基本结束;在1200℃～1300℃之间,Sm_2O_3与ZrO_2发生固溶的同时,固溶体开始转变为焦绿石结构的Sm_2Zr_2O_7,到1500℃所有固溶体完全转变为Sm_2Zr_2O_7;1500℃以后,Sm_2Zr_2O_7晶体逐渐长大并最终形成理想的Sm_2Zr_2O_7晶体。整个过程并无其它中间相生成。The forming mechanism of Sm2Zr2O7 prepared by solid reaction was studied by X-Ray diffraction method. The results show that the gradual substitution of Sm^3＋ for Zr^4＋site began from 1000℃. and was ended basically up tol400℃. The solid solution reaction between Sm2O3 and ZrO2 took place in the range of 1200℃-13000C, resulting in forming Sm2Zr2O7 with pyrochlore structure. The reaction last up to 1500℃, then was ended completely. When the temperature was over 1500℃, Sm2Zr2O7 crystal grew up gradually, and finally an ideal Sm2Zr2O7 crystal was obtained. No other intermediate phases were found in the whole process.

关 键 词：Sm2Zr2O7 形成机制 固溶体 氧空位 

分 类 号：TG115.23[金属学及工艺—物理冶金]