Formation Mechanism of Impure Phases and Crystallinity Investigation of YAG Powders Synthesized via the Co-precipitation Method  

作　　者：MA Benyuan PU Chunying HE Junbao ZHOU Dawei FU Yü WEI Nian LU Tiecheng 马奔原;PU Chunying;HE Junbao;ZHOU Dawei;FU Yü;WEI Nian;卢铁城(College of Physics and Electronic Engineering,Nanyang Normal University,Nanyang 473061,China;Department of Physics and Key Laboratory for Radiation Physics and Technology of Ministry of Education,Sichuan University,Chengdu 610064,China)

机构地区：[1]College of Physics and Electronic Engineering,Nanyang Normal University,Nanyang 473061,China [2]Department of Physics and Key Laboratory for Radiation Physics and Technology of Ministry of Education,Sichuan University,Chengdu 610064,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2021年第4期517-525,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Science Fund of Educational Department of Henan Province of China (No. 19A430002)。

摘　　要：We investigated the impure phase problem and summarized its two formation mechanisms of YAG powders synthesized via the co-precipitation method.The ions loss problem caused by high concentration reaction solution in the titration process was emphatically studied,and the corresponding thermodynamic explanation was carried out.In addition,influence of powder crystallinity and its new qualitative and quantitative standards were studied.One reason of impure phase is the local nonuniform mixture of Y and Al elements in precursor,which easily causes intermediate phases during calcination and difficulty of high pure powders at low temperatures.The other reason is the precipitation dissolution during titration and then the Y^(3+)/Al^(3+) loss,caused by high concentration of reaction solution.The powder crystallinity can be promoted by increasing calcination temperature or holding time of precursor.Besides the routine XRD method,the TEM-EDX method should be also introduced to directly determine the quality of crystallinity.

关 键 词：transparent ceramics phase transition CRYSTALLINITY CO-PRECIPITATION activity coefficient 

分 类 号：TQ174.758.23[化学工程—陶瓷工业]