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Phase relationships in the system Si3N4–SiO2–Yb2O3

Published online by Cambridge University Press:  03 March 2011

Toshiyuki Nishimura  and
Mamoru Mitomo
Toshiyuki Nishimura
Affiliation:
National Institute for Research in Inorganic Materials, 1–1, Namiki, Tsukuba-shi, Ibaraki 305, Japan
Mamoru Mitomo
Affiliation:
National Institute for Research in Inorganic Materials, 1–1, Namiki, Tsukuba-shi, Ibaraki 305, Japan
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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.

Type
Rapid Communication
Information
Journal of Materials Research , Volume 10 , Issue 2 , February 1995 , pp. 240 - 242
Copyright
Copyright © Materials Research Society 1995

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