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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
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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Investigation on the thermal decomposition of aged La2O3

摘要: 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).

 

Investigation on the thermal decomposition of aged La2O3

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).

 

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