Mechanism of Thermal Decomposition of Rare Earth Acetate Hydrates
来源期刊：Journal of Rare Earths1991年第2期
论文作者：王增林 庄文德 孙万明 牛春吉 唐功本 倪嘉缵
文章页码：104 - 108
摘 要：<正> The mechanism of thermal decomposition of rare earth acetate hydrates（Ln（Ac）3·nH2O,n=5,forLn=La;n=4,for Ln=Pr→Lu,Y,except Pm）has been studied by TG-DTG,DSC,infrared spectra,X-raydiffraction and chemical analysis.The thermal decomposition reaction consists of two stages,one is dehydrationand the other one is decompostion.The final product is oxide.It has been found that the temperature of pro-ducing anhydrous acetates decreases with increasing atomic number of rare earth elements.The activation ener-gies for dehydration and decomposition reaction of rare earth acetate hydrates have been calculated byFreeman-Carroll and Kissinger method.The dependence of activation energy Jor dehydration reaction on theatomic number of rare earth elements shows“inclined‘W’effect”.The enthalpy changes for dehydration anddecomposition reaction have been determined.
王增林，庄文德，孙万明，牛春吉，唐功本，倪嘉缵
摘 要：<正> The mechanism of thermal decomposition of rare earth acetate hydrates（Ln（Ac）3·nH2O,n=5,forLn=La;n=4,for Ln=Pr→Lu,Y,except Pm）has been studied by TG-DTG,DSC,infrared spectra,X-raydiffraction and chemical analysis.The thermal decomposition reaction consists of two stages,one is dehydrationand the other one is decompostion.The final product is oxide.It has been found that the temperature of pro-ducing anhydrous acetates decreases with increasing atomic number of rare earth elements.The activation ener-gies for dehydration and decomposition reaction of rare earth acetate hydrates have been calculated byFreeman-Carroll and Kissinger method.The dependence of activation energy Jor dehydration reaction on theatomic number of rare earth elements shows“inclined‘W’effect”.The enthalpy changes for dehydration anddecomposition reaction have been determined.
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