1. Key Laboratory for Rare-earth Chemical and Applying of Liaoning Province, School of Material Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016
3. Institute of Metallurgy and Materials, Northeastern University, Shenyang 110819
Cite this article:
ZHU Hongyan, MA Weimin, WEN Lei, GUAN Renguo,MA Lei, WU Nan. SYNTHESIS KINETICS OF (Y, Gd)2O3∶Eu3+ NANO-POWDERS DURING PROCESS OF PREPARATION. Acta Metall Sin, 2012, 48(6): 671-677.
Abstract Using NH3·H2·O and NH4HCO3 blended solution as a complex precipitation agent, (Y, Gd)2O3∶Eu3+ nano--particles were synthesized by co--precipitation reaction. XRD and SEM were applied to analyze the crystallization and morphology of the sample. The thermal decomposition curves of samples were analysed by TG-DTA at different heating rates. Results showed that under the conditions of pH=10 and reverse titration, the change process of (Y, Gd)2O3∶Eu3+ precursors is divided into three steps. The apparent activation energy of each step was calculated by using the Doyle--Ozawa and Kissinger methods. The calculated results are 191.54, 557.05 and 236.58 kJ·mol-1. The dynamic equations have been also established. The activation energy of (Y, Gd)2O3∶Eu3+ grain growth is 35.58 kJ·mol-1, indicating that grain growing is primarily controlled by interfacial reaction during process of preparation.
