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OALib Journal期刊
ISSN: 2333-9721
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(Y,Gd)2O3∶Eu3+纳米粒子制备过程中的合成动力学
DOI: 10.3724/SP.J.1037.2011.00735, PP. 671-677
Keywords: (Y,Gd)2O3∶Eu3+纳米粒子,合成动力学,活化能,微观形貌
Abstract:
采用反向滴定共沉淀法制备出(Y,Gd)2O3∶Eu3+前躯体,再在不同温度下煅烧,获得(Y,Gd)2O3∶Eu3+纳米粒子,用XRD和SEM对样品物相组成及形貌进行了表征;用TG--DTA获得了样品在不同升温速率下的热分解曲线.结果表明,前躯体在煅烧过程中的物相变化分为3个阶段,用Doyle-Ozawa法和Kissinger法分别计算出各个反应阶段的表观活化能,其平均值分别为191.54,557.05和236.58kJ·mol-1,并建立了动力学方程;(Y,Gd)2O3∶Eu3+晶粒生长活化能是35.58kJ·mol-1,纳米粒子形核过程中的晶粒长大由晶界扩散控制.
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