Abstract
The subsolidus phase diagram of Si 3 N 4 -Y 2 O 3 -La 2 O 3 system has been shown to involve fourtwo-phase regions and eight three-phase triangles. In Si_3N_4-rich area, there exists a new phase,0.4 Y 2 O 3 ·0.6La 2 O 3 ·3Si 3 N 4 . A limited solid solution of Y 2 O 3 ·Si 3 N 4 with La replacing Y up to55 mol% La 2 O 3 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) 2 O 3 ·Si 2 N 2 O), K-phase ((Y,La) 2 O 3 ·Si 2 N 2 O) and H-phase((Y, La) 10 (Si 4 ) 6 N 2 ).
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