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The oxidation behaviour of the silicon yttrium oxynitride Y(10)Si(7)O(23)N(4), the so-called H-phase, has been investigated in the temperature range 700-1400 C. Nitrogen retention in the oxidation product Y(4.67)(SiO(4))(3)O,(O-apatite) is discussed. The H-phase is one of the four quaternary compounds identified in hot-pressed Si(3)N(4) materials fabricated within the Si(3)N(4)-SiO(2)-Y(2)O(3) pseudoternary system.

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Authors: VEYRET J-B, JRC Petten (NL);VAN DE VOORDE M, JRC Petten (NL);BILLY M, University of Limoges, Laboratoire de Céramiques Nouvelles (FR)
Bibliographic Reference: Article: Journal of the American Ceramic Society, Vol. 75 (1992) No. 12, pp. 3289-3292
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