ESR and Moessbauer studies of crystallization process of iron phosphate glass.
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概要
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0.7Fe<SUB>2</SUB>O<SUB>3</SUB>–0.3P<SUB>2</SUB>O<SUB>5</SUB> glass was prepared by using a twin-roller method and the crystallization process of this glass was followed by means of ESR and Mössbauer spectroscopy in order to understand the state and the behavior of iron ions in the glass. The ESR line shape of the quenched 0.7Fe<SUB>2</SUB>O<SUB>3</SUB>–0.3P<SUB>2</SUB>O<SUB>5</SUB> glass was much broader than that of the crystallized glass heat-treated at 710 °C for 5 h. Moreover, the linewidth of Mössbauer spectra decreased monotonously through the crystallization process. These facts indicated that there existed a distribution of ligand fields around iron ions in the glass. The Mössbauer parameters, that is the isomer shift and the quadrupole splitting, of the 0.7Fe<SUB>2</SUB>O<SUB>3</SUB>–0.3P<SUB>2</SUB>O<SUB>5</SUB> glass showed that Fe<SUP>3+</SUP> ions in this glass were laid on distorted octahedral ligand fields. The magnetic interaction working in the 0.7Fe<SUB>2</SUB>O<SUB>3</SUB>–0.3P<SUB>2</SUB>O<SUB>5</SUB> glass at room temperature was dipole–dipole interaction. Besides, the Mössbauer spectrum of the glass exhibited no internal field line at room temperature. Hence, the glass is considered paramagnetic at room temperature. At the first stage of crystallization process, the α-Fe<SUB>2</SUB>O<SUB>3</SUB> particles precipitated were sufficiently small and so the specimen was superparamagnetic, as revealed from the ESR and Mössbauer spectra of heat-treated specimens.
- 公益社団法人 日本化学会の論文
著者
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Hirao Kazuyuki
Department Of Material Chemistry Graduate School Of Engineering Kyoto University
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Ota Rikuo
Department Of Chemistry And Materials Technology Kyoto Institute Of Technology
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Soga Naohiro
Department Of Industrial Chemistry Faculty Of Engineering Kyoto University
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Tanaka Katsuhisa
Department of Chemistry and Materials Technology, Faculty of Engineering and Design, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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Ota Rikuo
Department of Industrial Chemistry, Faculty of Engineering, Kyoto University
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