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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.120  No.1406 (October) (2012)  >  pp.420-424

Journal of the Ceramic Society of Japan
<<Previous article Vol.120  No.1406 (October) (2012)   pp.420 - 424 Next article>>

Characterization of Fe-doped lithium aluminosilicate glass-ceramic materials by synchrotron radiation techniques

Yu-Han WU1), Kuo-Chuan HSU2), Chih-Hao LEE1) 3)
1) Department of Engineering and System Science, National Tsing Hua University 2) Ta Hsiang Containers Ind. Co., Ltd. 3) National Synchrotron Radiation Research Center

The effects of doping of Fe ions in lithium aluminosilicate glass-ceramic under varied thermal treatment conditions were studied by synchrotron X-ray powder diffraction, X-ray absorption near edge structure (XANES) and infrared microscopy. When doping concentration is high (>0.6 wt %), Fe ions tend to migrate into the main crystalline phases; while these ions remain in a disorder environment at low doping level. In high doping samples heated at higher than 800°C, multiple scattering peaks in XANES spectra can be observed in samples, which imply that Fe ions substitute into the Li sites of the main solid solution phase. The diffraction results show that a small amount of Fe oxide (<0.2 wt %) in a LAS glass-ceramic material decreases the crystallization temperature of β-quartz solid solution by ~50°C. Samples doped with ~0.6–3 wt % of Fe ions results in a raised formation temperature of β-quartz solid solution and a retarded phase transformation of β-quartz solid solution to β-spodumene solid solution.


Keyword:
Lithium aluminosilicate glass-ceramic, XANES, Microstructure evolution, Transition ions

Received: June 26, 2012
Accepted: August 17, 2012 , Published online: October 01, 2012
Copyright © 2012 The Ceramic Society of Japan

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