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Application of the IR transmission method and the Mossbauer effect to the crystallization of calcium gallate glass

http://hdl.handle.net/20.500.12678/0000002674
e29facd3-5304-4da8-96fe-ac89df87dcb2
51b127e3-ee43-4422-b505-adcd8c5e8cc9
Publication type
Journal article
Upload type
Publication
Title
Title Application of the IR transmission method and the Mossbauer effect to the crystallization of calcium gallate glass
Language en
Publication date 1997
Authors
Kubuki, S.
Nishida, T.
Pho Kaung
Yagi, T.
Maeda, Y.
Description
Crystallization of infrared-light transmitting 40CaO·60Ga2O3 glass caused by heat treatment, Full-size image (<1 K)γ-ray irradiation and YAG laser irradiation was investigated. The X-ray diffraction (XRD) data revealed that a CaGa4O7 phase was precipitated by heat treatment. The Avrami index (n) of 1.7±0.2 obtained from `the Fourier transform infrared (FT-IR) transmission method' combined with the Johnson–Mehl–Avrami (JMA) equation indicated that the crystallization proceeded three dimensionally. The activation energy (Ea) of 7.2±0.3 eV obtained from the JMA plot was equal to that obtained from the Kissinger plot in the differential thermal analysis: Ea=7.1±0.2 eV. Mössbauer spectra of 40CaO·59Ga2O3·Full-size image (<1 K)2O3 samples showed the oxidation of iron from Fe2+ to Fe3+. Mössbauer spectra of the 40CaO·59Ga2O3·Full-size image (<1 K)2O3 samples irradiated with the YAG laser also showed an oxidation of Fe2+ to Fe3+. In case of Full-size image (<1 K)γ-ray irradiated samples, however, a reduction of the iron from Fe3+ to Fe2+ was observed. This result indicates that Fe3+ occupies substitutional sites of Ga3+ in the gallate glass.
Keywords
O180
Identifier http://uyr.uy.edu.mm/handle/123456789/29
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