Study on analysis of crystal structure in CeO_2 doped with Er_2O_3 or Gd_2O_3

作     者：Yuki Tahara Kazufumi Yasunaga Toshiyuki Matsui Fuminobu Hori Akihiro Iwase 

作者机构：Department of Materials ScienceOsaka Prefecture University1-1Gakuen-choNaka-kuSakaiOsaka599-8531Japan Department of Applied Quantum Physics and Nuclear EngineeringKyushu University744MotookaNishikuFukuoka 819-0395Japan 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2010年第28卷第S1期

页      面：164-167页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：Project supported by Japan Society for the Promotion of Science (JSPS) Research (Grant-in-aid for Scientific Research B No. 21360469) the Osaka Nuclear Science Association (ONSA),the XAFS Measurements at KEK-PF were Performed with the Approval of KEK (2009G536) 

主　　题：CeO2 ceramic pellets Er2O3 and Gd2O3 doping Change in lattice structure XRD XAFS rare earths 

摘      要：To simulate the effects of burnable poison doping in nuclear fuel UO2,Er2O3(or Gd2O3)-doped CeO2 pellets were prepared. Changes in lattice constant and atomic disordering for CeO2 due to the Er2O3 and Gd2O3 doping were measured by means of XRD and XAFS. By the Er2O3 doping,the lattice constant decreased,and a disordering of lattice structure was induced in the samples. The doping with Er2O3 also induced the disordering of atomic arrangement around Er atoms,which was observed through the change in XAFS spectra. In contrast,the effect of Gd2O3 doping was smaller than that of Er2O3 doping. The result was discussed in terms of ionic size of dopants in CeO2 crystal.