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Phase relationships in the system Si3N4–SiO2–Yb2O3

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Abstract

Phase relationships in the system Si3N4−SiO2−Yb2O3 have been investigated at 1750 °C and compared with those in the system Si3N4−SiO2−Y2O3. Two types of ytterbium silicon oxynitride, Yb2Si3O3N4 (tetragonal) and Yb4Si2O7N2 (monoclinic), were confirmed to exist. The x-ray powder diffraction data of two compounds were indexed based on the space group and unit cells. Melting temperature of Yb4Si2O7N2 was determined as 1870 °C. Yb4Si2O7N2 is a better intergranular phase of silicon nitride ceramics for its high melting temperature.

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Authors and Affiliations

  1. National Institute for Research in Inorganic Materials 1–1, Namiki, Tsukuba-shi, Ibaraki 305, Japan

    Toshiyuki Nishimura & Mamoru Mitomo

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  1. Toshiyuki Nishimura
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  2. Mamoru Mitomo
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Nishimura, T., Mitomo, M. Phase relationships in the system Si3N4–SiO2–Yb2O3. Journal of Materials Research 10, 240–242 (1995). https://doi.org/10.1557/JMR.1995.0240

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  • DOI: https://doi.org/10.1557/JMR.1995.0240

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