Effect of Fe2O3 Content on the Local Structure and Crystallization Mechanism of Calcium Gallate Glasses |
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| Authors: | S. Kubuki T. Nishida |
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| Affiliation: | (1) Department of Chemical and Biological Engineering, Ube National College of Technology, Tokiwadai 2-14-1, Ube, 755-8555, Japan;(2) Department of Biological and Environmental Chemistry, Kyushu School of Engineering, Kinki University, Kayanomori, Iizuka, 820-8555, Japan |
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| Abstract: | 57Fe Mössbauer and FT-IR of 60CaO·(40-x)Ga2O3·xFe2O3 glasses revealed that Fe(III)O4 tetrahedra occupy substitutional sites of Ga(III)O4 tetrahedra. The activation energy for crystallizaation (Ea) obtained from DTA study decreases distinctly from 8.9 to 4.8 eV with an increase in the Fe2O3 content. In the case of 40CaO·(60-x)Ga2O3·xFe2O3 glasses, a week doublet due to Fe(II)O4 tetrahedra or Fe(III)O6 octahedra was observed in addition to Fe(III)O4 tetrahedra. The Eavalue decreases gradually from 7.1 to 5.6 eV with an increasing Fe2O3 content. These results indicate that a large amount of Fe2O3 in the network structure is favorable for the crystallization of calcium gallate glass, since it reduces the chemical bond strength. |
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