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.
MA Wei-Min
,
ZHU Hong-Yan
. SYNTHESIS KINETICS OF (Y, Gd)2O3∶Eu3+ NANO-POWDERS DURING PROCESS OF PREPARATION[J]. Acta Metall Sin, 2012
, 48(6)
: 671
-677
.
DOI: 10.3724/SP.J.1037.2011.00735
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