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The effect of TiO2 addition on the preparation and phase transformation for precursor β-spodumene powders

Published online by Cambridge University Press:  03 March 2011

Moo-Chin Wang
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

Fine β-spodumene-type amorphous powders were obtained through sol-gel techniques using Si(OC2H5)4, Al (OC2H5)3, LiOCH3, and Ti(OC2H5)4 as the starting metal alkoxides. Differential thermal analysis (DTA), x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron diffraction (ED) analysis were utilized to study the phase transformation behavior of the LAST gels. The viscosity of the LAST solution increased abruptly at longer time when the TiO2 content was increased. As the TiO2 content was increased, the peak position of β-spodumene phase formation in DTA curves was shifted to a lower temperature. For calcination of LAST gels at 800°-1200 °C, the crystallized phases are composed of the major phase of β-spodumene and a minor phase of rutile (TiO2). Unlike earlier studies, heating the dried LAST gels from 800 °C to 1200 °C did not show β-eucryptite, nor found γ-spodumene.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 9 , September 1994 , pp. 2290 - 2297
Copyright
Copyright © Materials Research Society 1994

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References

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