PHASE RELATIONSHIPS IN THE Si3N4-Y2O3-La2O3 SYSTEM

PHASE RELATIONSHIPS IN THE Si3N4-Y2O3-La2O3 SYSTEM

The subsolidus phase diagram of Si3N4-Y2O3-La2O3 system has been shown to involve fourtwo-phase regions and eight three-phase triangles. In Si3N4-rich area, there exists a new phase,0.4 Y2O3·0.6La2O3·3Si3N4. A limited solid solution of Y2O3·Si3N4 with La replacing Y up to55 mol% La2O3 has been defin...

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Veröffentlicht in:中国科学：数学英文版 1989 (4), p.429-433
1. Verfasser: 曹国忠 黄振坤 严东生
Format: Artikel
Sprache:eng
Schlagworte:
ceramics
equilibrium
nitride
phase
relationship
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Zusammenfassung:The subsolidus phase diagram of Si3N4-Y2O3-La2O3 system has been shown to involve fourtwo-phase regions and eight three-phase triangles. In Si3N4-rich area, there exists a new phase,0.4 Y2O3·0.6La2O3·3Si3N4. A limited solid solution of Y2O3·Si3N4 with La replacing Y up to55 mol% La2O3 has been defined. The reverse replacement does not occur. Three continuous solidsolutions of nitrogen-containing silicates in Y-La-Si-O-N system have been confirmed. Theyare J-phase（2（Y,La）2O3·Si2N2O）, K-phase （（Y,La）2O3·Si2N2O） and H-phase(（Y, La）10（SiO4）6N2).
ISSN:1674-7283
1869-1862