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Structural changes of glass-ceramics of the Cu2O-Al2O3-SiO2 system on heating in air

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Abstract

The behaviour of copper ions in low thermal expansion glass-ceramics prepared from Cu2O · Al2O3 ·nSiO2 glasses, or inβ-spodumene type Cu2O · Ae2O3 ·nSiO2 crystals included in the glass-ceramics on heating in air was investigated. On hewing at 300 to 500° C, the copper ions behaved as in the corresponding glasses. Cuprous ions in the glass-ceramics orβ-spondumene type crystals were oxidized into the cupric state, and at the same time an equal amount of cuprous ions to those oxidized were expelled out of the specimen for the requirement of electrical charge neutrality and then reacted with oxygen to form CuO on the surface. The oxidation of cuprous ions and the decrease of the copper content of theβ-spondumene type crystals brought about a considerable decrease in the lattice spooings.

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Authors and Affiliations

  1. Department of Industrial Chemistry, Faculty of Engineering, Mie University, Kamihama, Tsu Mie-ken, 514, Japan

    Kanichi Kamiya, Toshinobu Yoko & Keiji Moroishi

  2. Department of Materials Science and Technology, Technological University of Nagaoka, 949-54, Nagaoka, Niigata-ken, Japan

    Kazumasa Matusita

  3. Institute for Chemical Research, Kyoto University, 611, Gokasho, Uji, Kyoto-fu, Japan

    Sumio Sakka

Authors
  1. Kanichi Kamiya
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  2. Toshinobu Yoko
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  3. Keiji Moroishi
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  4. Kazumasa Matusita
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  5. Sumio Sakka
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Kamiya, K., Yoko, T., Moroishi, K. et al. Structural changes of glass-ceramics of the Cu2O-Al2O3-SiO2 system on heating in air. J Mater Sci 21, 131–136 (1986). https://doi.org/10.1007/BF01144710

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  • DOI: https://doi.org/10.1007/BF01144710

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