Citation: SHI Shu-Jun, MA Wei-Min, MA Lei, SUN Yang, LI Xiao-Long, HAN Feng, GUAN Ren-Guo. Effect of BaHfO3:Ce Powders Activation Energy on Sintering Transparency[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(4): 885-894. doi: 10.11862/CJIC.2014.155
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BaHfO3:Ce powders were prepared by normal strike co-precipitation(NSC) method and reverse strike co-precipitation(RSC) method respectively. The phase composition, particle morphology and luminescence properties of BaHfO3:Ce powders were characterized by XRD, TG-DTA and SEM. The effect of different precipitation methods on synthesis kinetics of particle was investigated at different heating rates. The results show that the precursors prepared by NSC and RSC decompose in three stages. The apparent activation energy of each stage is calculated using the Doyle-Ozawa and Kissinger methods. The average apparent activation energies of the three reaction stages of precursors prepared by NSC and RSC are 83.41, 61.70, 262.11 kJ·mol-1 and 81.70, 42.86, 253.44 kJ·mol-1 respectively. The activation energies of grain growth for BaHfO3:Ce powders prepared by NSCand RSCare 27.36 kJ·mol-1 and 23.07 kJ·mol-1 severally. The powder prepared by RSC method exhibits excellent luminescence properties with higher intensity of excitation spectrum excited by 530nm and emission spectrum excited by 399 nm. The BaHfO3:Ce ceramic is partly transparent after being sintered at 2073 Kin vacuum for 3 h.
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