In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 14, No. 9 ( 1999-09), p. 3559-3566
Abstract:
The activation energy for crystallization of β-spodumene in TiO 2 added Li 2 O–Al 2 O 3 –4SiO 2 (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 TiO 2 content increased. For samples with addition of 0, 5.0, and 10.0 wt% TiO 2 , 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 TiO 2 addition of 0, 5.0, and 10.0 wt%, showing a rodlike growth. In the LAS precursor powder system, TiO 2 did not act as the nucleative agent.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/JMR.1999.0482
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
1999
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
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