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Effect of TiO2 addition on the crystallization of Li2O–Al2O3–4SiO2 precursor powders by a sol-gel process

Published online by Cambridge University Press:  31 January 2011

Shaw-Bing Wen ,
Nan-Chung Wu ,
Sheng Yang  and
Moo-Chin Wang
Shaw-Bing Wen
Affiliation:
Department of Resources Engineering, National Cheng-Kung University, 1 Ta-Hsueh Road, Tainan, 70101, Taiwan, Republic of China
Nan-Chung Wu
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, 1 Ta-Hsueh Road, Tainan, 70101, Taiwan, Republic of China
Sheng Yang
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, 1 Ta-Hsueh Road, Tainan, 70101, Taiwan, Republic of China
Moo-Chin Wang
Affiliation:
Department of Mechanical Engineering, National Kaohsiung Institute of Technology, 415 Chien-Kung Road, Kaohsiung, 80782, Taiwan, Republic of China
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Abstract

The activation energy for crystallization of β-spodumene in TiO2 added Li2O–Al2O3–4SiO2 (LAS) precursor powders by a sol-gel process was studied by using isothermal and nonisothermal methods. Nonisothermal kinetics for the LAS precursor powder system were investigated using differential thermal analysis (DTA) and quantitative x-ray diffraction (XRD) analysis. The rate of crystallization of LAS precursor powders decreased as the TiO2 content increased. For samples with addition of 0, 5.0, and 10.0 wt% TiO2, the activation energies for crystallization by DTA evaluation were 165.06, 194.46, and 205.38 kJ/mol, respectively. According to the quantitative XRD method, the values computed by the Johnson–Mehl–Avrami equation were 162.54, 189.42, and 196.14 kJ/mol, respectively. The values obtained by isothermal and nonisothermal kinetic methods from DTA and XRD analyses were in good agreement. The growth morphology parameters were 0.59, 0.70, and 0.76, respectively, for the LAS precursor powder with TiO2 addition of 0, 5.0, and 10.0 wt%, showing a rodlike growth. In the LAS precursor powder system, TiO2 did not act as the nucleative agent.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 9 , September 1999 , pp. 3559 - 3566
Copyright
Copyright © Materials Research Society 1999

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