Synthesis, characterization and nonisothermal decomposition kinetics of La2(CO3)3·3.4H2O

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• 作者：Xiang-hui Zhang ; Chuan He ; Ling Wang…
• 关键词：Nonisothermal kinetics ; Lanthanum carbonate hydrates ; Thermal decomposition mechanism ; Intermediate products
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：119
• 期：3
• 页码：1713-1722
• 全文大小：1,105 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

The single-phase La2(CO3)3·3.4H2O with the orthorhombic type was synthesized by hydrothermal method. The results characterized by XRD, FTIR and DTA–TG showed that the thermal decompositions of La2(CO3)3·3.4H2O below 1,273?K experience four steps, which involve a two-stage dehydration and formation of anhydrous La2(CO3)3 at first, and then the formation of La2O2CO3 and La2O3, respectively. An additional intermediate product assigned to La2O(CO3)2 was observed in the third step. Thermal decomposition kinetics of La2(CO3)3 to La2O2CO3 was investigated under nonisothermal conditions. The dependence of the activation energy on the reaction degree was estimated by Ozawa and Friedman isoconversional methods, which confirm that the step is a multistage kinetic process. The reaction mechanism determined by a multivariate nonlinear regression program is a kind of two-stage consecutive reaction (A n-em class="a-plus-plus">A n model), f(α)?=?n(ln(1???em class="a-plus-plus">α (1???/n))(1???em class="a-plus-plus">α)). The first stage: E?=?435?±?9?kJ?mol?, lg A?=?28.7?±?0.8, Dimension1?=?0.28; the second stage: E?=?234?±?4?kJ?mol?, lg A?=?13.5?±?0.3, Dimension2?=?1.22.