Investigation on the thermal decomposition of aged La<sub>2</sub>O<sub>3</sub>

Qifeng Shu; Jianhua Liu; Jiayun Zhang; Mei Zhang

doi:10.1016/S1005-8850(06)60092-3

Volume 13 Issue 5

Oct. 2006

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Abstract

International Journal of Minerals, Metallurgy and Materials > 2006 > 13(5): 456-460. > DOI: 10.1016/S1005-8850(06)60092-3

Qifeng Shu, Jianhua Liu, Jiayun Zhang, and Mei Zhang, Investigation on the thermal decomposition of aged La₂O₃, J. Univ. Sci. Technol. Beijing , 13(2006), No. 5, pp.456-460. https://dx.doi.org/10.1016/S1005-8850(06)60092-3

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Materials

Investigation on the thermal decomposition of aged La₂O₃

Author Affilications

Metallurgical and Ecological Engineering School,University of Science and Technology Beijing,Beijing 100083,China

Funds:

This work was financially supported by the National Natural Science Foundation of China (No.50374008).

Received: 17 August 2005;

Graphical Abstract

Abstract

Abstract

The thermal decomposition process of air-aged La₂O₃ in argon atmosphere was studied using nonisothermal TG-DSC. X-ray diffraction and TG-DSC analysis showed that the aged powder was composed of La(OH)₃ with small amounts of oxycarbonate. The decomposition process of air-aged La₂O₃ involves the two-step decomposition of La(OH)₃ and the decomposition of oxycarbonate. The kinetic analysis of the two-step decomposition of La(OH)₃ was carried out using Coats-Redfern and isoconversion (Ozawa) methods. The kinetics of the two-step decomposition can be described in terms of the nucleation and growth model A (m=1.5,m is the model parameter) and A (m=2.5),respectively. The apparent activation energy for the first step is 136-144 (Coats-Redfern) and 137-164 kJ/mol (isoconversion). The apparent activation energy for the second step is 191-194 (Coats-Redfern) and 186-213 kJ/mol (isoconversion).
- lanthanum oxide,
- aging,
- decomposition,
- nonisothermal kinetics,
- mechanism

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