Pressureless reactive sintering mechanism of nanocrystalline Bi_2O_3-Y_2O_3 solid electrolyte  

作　　者：Qiang Zhen Liangyan Dong Gang Shi Rong Li Weiming He Jianqiang Liu 

机构地区：[1]Nano-science and Nano-technology Research Center, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China [2]Railway Worker College of Qiqihar, Qiqihar 161002, China [3]School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

出　　处：《Journal of University of Science and Technology Beijing》2006年第1期87-91,共5页北京科技大学学报（英文版）

基　　金：financially supported by the National Nature Science Foundation of China (No.20101006);the Nano Technology Special Foundation of Shanghai Science and Technology Committee (No.O452nm073)

摘　　要：The nanocrystalline Bi2O3-Y2O3 solid electrolyte material was synthesized by pressureless reactive sintering process with Bi2O3 and Y2O3 nano mixed powder as raw materials, which was prepared by a chemical coprecipitation process. The study on the behavior of nano δ-Bi2O3 formation and its grain growth showed that the solid solution reaction of Y2O3 and δ-Bi2O3 to form δ-Bi2O3 occurs mainly in the initial stage of sintering process, and nano δ-Bi2O3 crystal grains grow approximately following the rule of paracurve （（D-D0）^2=K.t） during sintering process. After sintered at 600℃ for 2 h, the samples could reach above 96% in relative density and have dense microstructure with few remaining pores, the δ-Bi2O3 grains are less than 100 nm in size.The nanocrystalline Bi2O3-Y2O3 solid electrolyte material was synthesized by pressureless reactive sintering process with Bi2O3 and Y2O3 nano mixed powder as raw materials, which was prepared by a chemical coprecipitation process. The study on the behavior of nano δ-Bi2O3 formation and its grain growth showed that the solid solution reaction of Y2O3 and δ-Bi2O3 to form δ-Bi2O3 occurs mainly in the initial stage of sintering process, and nano δ-Bi2O3 crystal grains grow approximately following the rule of paracurve （（D-D0）^2=K.t） during sintering process. After sintered at 600℃ for 2 h, the samples could reach above 96% in relative density and have dense microstructure with few remaining pores, the δ-Bi2O3 grains are less than 100 nm in size.

关 键 词：nanocrystalline bismuth oxide-yttrium oxide solid electrolyte pressureless reactive sintering process crystal grain growth phase transformation 

分 类 号：TB383[一般工业技术—材料科学与工程]