Thermal behavior and crystallization kinetics of cerium dioxide precursor powders

Thermal behavior and crystallization kinetics of cerium dioxide precursor powders
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二氧化铈前驱体粉末的热行为和结晶动力学

DOI:
10.1016/j.ceramint.2014.05.117
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发表时间:
2014-11
影响因子:
5.2
通讯作者:
Xiujian Zhao
Xiujian Zhao
中科院分区:
材料科学1区
文献类型:
--
作者:
Horng-Huey Ko;Guoli Yang;Moo-Chin Wang;Xiujian Zhao

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采用差示扫描量热法/热重法、x射线衍射、透射电镜、选择区域电子衍射和高分辨率透射电镜研究了在293 K和pH=9条件下沉淀法合成的二氧化铈(CeO2)前驱体粉末的热行为和结晶动力学。前驱体粉末的分子式可表示为CeO2·1/2H2O。采用非等温法得到了二氧化铈前驱体结晶ceo2的活化能为73.49 kJ/mol。生长形貌参数n和结晶指数近似为2.0,表明二氧化铈前驱体粉末的二维片状生长是ceo2结晶的主要机制。
The thermal behavior and crystallization kinetics of cerium dioxide (CeO2) precursor powders synthesized using a precipitation route at 293 K and pH=9 were investigated using differential scanning calorimetry/thermogravimetry, X-ray diffraction, transmission electron microscopy, selected area electron diffraction, and high resolution TEM. The formula of precursor powders can be expressed as CeO2·1/2H2O. The activation energy of CeO2crystallization from cerium dioxide precursors was obtained by the non-isothermal method and was 73.49 kJ/mol. The parameter of growth morphology (n) and index of crystallization were approximated as 2.0, meaning that two-dimensional growth with plate-like morphology was the primary mechanism of CeO2crystallization from cerium dioxide precursor powders.
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