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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Thermal dehydration kinetics involved during the conversion of gadolinium hydroxide to gadolinium oxide
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Thermal dehydration kinetics involved during the conversion of gadolinium hydroxide to gadolinium oxide

机译：在将氢氧化钆转化为钆氧化钆期间的热脱水动力学

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Non-isothermal dehydration kinetics of gadolinium hydroxide (Gd(OH)(3)) was studied by thermogravimetry analysis (TGA), and differential thermal analysis (DTA). It was observed that the dehydration of Gd(OH)(3) occurred in two steps. In step I, Gd(OH)(3) dehydrates to GdOOH at similar to 596 K. Finally, Gd2O3 is formed after complete dehydration of GdOOH at similar to 710 K. The kinetic triplets (activation energy, preexponential factor and reaction mechanism) were calculated for step I and step II. The activation energy was determined by using the Kissinger-Akahira-Sunsose (KAS) iso-conversional method. The results indicated that the average activation energy was higher for step II (91.29 kJ/mol) as compared to step I (77.94 kJ/mol). The reaction mechanism was estimated by following two different master plot methods such as Criado and integral master plot method. Both the master plot methods have shown similar results. It was found that the Avrami-Erofeev A3 nucleation reaction mechanism dominated in both the dehydration steps. (C) 2019 Elsevier B.V. All rights reserved.
机译：通过热重试验（TGA）研究了氢氧化钆（Gd（OH）（3））的非等温脱水动力学，以及差分热分析（DTA）。观察到Gd（OH）（3）的脱水分为两个步骤。在步骤I中，Gd（OH）（3）与596k类似的GDOOH脱水。最后，在类似于710K的GDOOH的完全脱水后形成Gd2O3。动力学三胞胎（活化能量，预胶质因子和反应机制）是计算步骤I和步骤II。通过使用基辛格-Akahira-Sunsose（KAS）Iso-Connession方法来确定激活能量。结果表明，与步骤I（77.94kJ / mol）相比，步骤II（91.29kJ / mol）的平均活化能较高。通过以下两种不同的母图方法如CRIADO和积分母图方法估计反应机理。主图方法都显示出类似的结果。发现Avrami-erofeev A3成核反应机制在脱水步骤中占主导地位。 （c）2019 Elsevier B.v.保留所有权利。

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