Gd,Bi掺杂的YBaCo_4O_(7+δ)材料微结构和氧吸附性质  

Microstructure and oxygen absorption properties of Gd,Bi doped YBaCo_4O_(7+δ) compounds

作　　者：张亚梅[1] 全传笔[1] 郭银涛[1] 韩汝取[1] 

机构地区：[1]江苏科技大学数理学院,江苏镇江212003

出　　处：《江苏科技大学学报（自然科学版）》2011年第4期405-408,共4页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：江苏科技大学博士科研启动基金资助项目

摘　　要：采用固相反应法制备出了Y0.9Gd0.1BaCo4O7+δ和Y0.9Bi0.1BaCo4O7+δ2种吸氧材料,研究吸氧材料的微结构和氧吸附性能.Rietveld全谱拟合XRD结果显示:Y0.9Gd0.1BaCo4O7+δ样品具有单一的YBaCo4O7+δ的晶体结构(空间群为P63mc),而Y0.9Bi0.1BaCo4O7+δ除了具有YBaCo4O7+δ的主相外,还出现了YBiBa2O6第二相材料.Gd,Bi元素的掺杂改变了YBa-Co4O7+δ材料的晶胞参数和Co-O键长键角,使(Co1)O4和(Co2)O4四面体发生了畸变.热重(TG)结果显示:在700～870℃高温区,Y0.9 Bi0.1 BaCo4O7+δ样品的氧吸附性能明显优于YBaCo4O7+δ材料,而Y0.9 Gd0.1 BaCo4O7+δ的氧吸附性能则差于YBaCo4O7+δ.Y0.9Bi0.1BaCo4O7＋δ and Y0.9Gd0.1BaCo4O7＋δ are successfully fabricated by solid state reaction.Microstructure and oxygen absorption of all the samples are investigated.The results from XRD and Rietveld refinement indicate that Y0.9Gd0.1BaCo4O7＋δ has single YBaCo4O7＋δcrystal structure（Space group P63mc） whereas Y0.9Bi0.1BaCo4O7＋δ has major phase of YBaCo4O7＋δcrystal structure except for peculiar second phase YBiBa2O6.The substitution of Gd,Bi elements changes unit cell parameters,Co-O bond distances and angles of YBaCo4O7＋δ.Moreover,it makes the distortion of（Co1）O4 and（Co2）O4 tetrahedra.TG results indicate that in high temperature range of 700~870 ℃.it is obvious that the maximum oxygen absorption property of Y0.9Bi0.1BaCo4O7＋δis better than that of YBaCo4O7＋δ whereas oxygen absorption property of Y0.9Gd0.1BaCo4O7＋δ is poorer than that of YBaCo4O7＋δ.

关 键 词：YBaCo4O7+δ 掺杂 氧吸附 微结构 

分 类 号：O469[理学—凝聚态物理]