采用TG-DTG方法,得到LaCl3*nH2O晶体在空气中热分解过程及相应分解反应的活化能,即在84~112℃时,LaCl3*7H2O失去4个结晶水,分解反应的活化能为133.2kJ/mol,在123.2~137.9℃时,LaCl3*3H2O失去2个结晶水,分解反应的活化能为153.9kJ/mol,在162.5~177.4℃时,LaCl3*H2O失去1个结晶水,分解反应的活化能为454.6kJ/mol,在397.7~464.5℃时,LaCl3气相水解为LaOCl,活化能为66kJ/mol.在温度低于900℃(最高测试温度)时,LaOCl能稳定存在.
参考文献
[1] | Wendlandt W W.The thermal decomposition of the heavier rare earth metal chloride hydrates[J].Journal of Radioanalytical and Nuclear Chemistry,1959(09):136-139. |
[2] | Powell J E;Burkholder H R .The solubilities of lanthanum chloride 7-hydrate and lamthanum 6-hydrate in water,and a study of the thermal decomposition of hydrated lanthanum chloride[J].Journal of Radioanalytical and Nuclear Chemistry,1960,14:65-70. |
[3] | 苏勉曾;李根培 .稀土元素氯化物水合物的脱水过程与水解反应机理[J].化学通报(印刷版),1979,4:34-38. |
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