Thermal Decomposition of Indium(III) Hydroxide Prepared by the Microwave-Assisted Hydrothermal Method
Thermal Decomposition of Indium(III) Hydroxide Prepared by the Microwave-Assisted Hydrothermal Method
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DOI：
10.1111/j.1551-2916.2008.02811.x
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发表时间：
2008-12-01
影响因子：
3.9
通讯作者：
Kimizu, Takaaki
中科院分区：
文献类型：
--
作者：
Koga, Nobuyoshi;Kimizu, Takaaki
用微波辅助水热法从InCl（3）和尿素的混合水溶液中沉淀出平均尺寸为0.348 μ m的立方形In（OH）（3）颗粒。通过三种不同温度程序模式下的热分析测量，并辅以多种物理化学技术，研究了样品的热分解动力学和机理。在热分解过程中，没有发现中间化合物从Al 2 O3-In（OH）（3）到Al 2 O3-In（2）O（3）。显着的热分解诱导期被确定为本反应的最特征的动力学现象之一，连同在反应的后半部分的表面产物层上的裂纹形成。反应的动力学速率行为的特点是物理几何学的表面成核和随后的进展建立的反应界面向内向反应物颗粒的中心，其中的表面成核和进展的反应界面的表观活化能估计为257和140 kJ/mol，分别。
Cubic-shaped In(OH)(3) particles with average size of 0.348 mu m were precipitated from a mixed aqueous solution of InCl(3) and urea by a microwave-assisted hydrothermal method. The kinetics and mechanisms of the thermal decomposition of the sample were investigated by means of thermoanalytical measurements under three different modes of temperature program, complemented by several physicochemical techniques. No intermediate compound was found during the course of thermal decomposition from cubic-In(OH)(3) to cubic-In(2)O(3). Distinguished induction period for the thermal decomposition was identified as one of the most characteristic kinetic phenomena of the present reaction, together with the crack formation on the surface product layer during the second half of the reaction. The kinetic rate behavior of the reaction was characterized physicogeometrically as the surface nucleation and subsequent advancement of the established reaction interface inward toward the center of the reactant particle, where the apparent activation energies for the surface nucleation and advancement of the reaction interface were estimated as 257 and 140 kJ/mol, respectively.