The subsolidus phase diagram of Si_3N_4-Y_2O_3-La_2O_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_2O_3·0.6La_2O_3&...The subsolidus phase diagram of Si_3N_4-Y_2O_3-La_2O_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_2O_3·0.6La_2O_3·3Si_3N_4. A limited solid solution of Y_2O_3·Si_3N_4 with La replacing Y up to55 mol% La_2O_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)_2O_3·Si_2N_2O), K-phase ((Y,La)_2O_3·Si_2N_2O) and H-phase((Y, La)_(10)(SiO_4)_6N_2).展开更多
文摘The subsolidus phase diagram of Si_3N_4-Y_2O_3-La_2O_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_2O_3·0.6La_2O_3·3Si_3N_4. A limited solid solution of Y_2O_3·Si_3N_4 with La replacing Y up to55 mol% La_2O_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)_2O_3·Si_2N_2O), K-phase ((Y,La)_2O_3·Si_2N_2O) and H-phase((Y, La)_(10)(SiO_4)_6N_2).
