稀土元素替代对RBaCo_4O_(7+δ)氧吸附/脱附性能影响的研究  

Effects of Rare Earth Substitution on the Oxygen Adsorption/Desorption Properties of RBaCo_4O_(7+δ)

作　　者：赵利敏[1] 王娇[1] 程永光[1] 张宝森[1] 李维[1] 王小超[1] 刘少辉[1] 

机构地区：[1]河南工程学院理学院,郑州451191

出　　处：《中国陶瓷》2017年第8期20-23,共4页China Ceramics

基　　金：河南省科技攻关计划资助项目(132102210035);河南省基础与前沿技术研究计划项目(142300410438;142300410439);地方高校国家级大学生创新创业训练计划项目(201611517041)

摘　　要：采用固态反应法制备了稀土元素(R=Yb、Er、Dy)替代的RBaCo_4O_(7+δ)氧吸附材料,对其进行了XRD和热重(TG)分析,研究了稀土元素元素替代对其氧吸附/脱附性能的影响。XRD结果表明:不同稀土元素替代的RBaCo_4O_(7+δ)材料具有单一的六方密排晶体结构(空间群为P63mc(186))。热重结果显示:从室温到1000℃,所有样品经历两次氧吸附过程,DyBaCo_4O_(7+δ)样品最大氧吸附量明显高于YbBaCo_4O_(7+δ)的最大氧吸附量。Rare earth（R=Yb, Er, Dy） substituted RBaCo_4O_（7＋δ） samples were prepared by solid state reaction method. Effects of rare earth substitution on the oxygen absorption properties was investigated by XRD and TG. XRD results show that rare earth doped RBaCo_4O_（7＋δ） powders are single phase with the hexagonal crystal structure（space group of P63mc（186）） and no impurity phases exist in RBaCo_4O_（7＋δ） powders. TG analysis shows that all the samples undergo two oxygen absorption processes from room temperature to 1000 ℃ and oxygen absorption property of Dy BaCo_4O_（7＋δ） is larger than that of Yb BaCo_4O_7, which may provide a route to enhance the oxygen absorption property of RBaCo_4O_（7＋δ）by rare earth substitution.

关 键 词：RBaCo4O7+δ 氧吸附/脱附性能 稀土元素替代 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]