Abstract
A literature survey and recent results on phase relationships in the quasi-ternary systems RE2O3-Al2O3-SiO2 are given. The investigated systems exhibit extended ternary solid solutions, RE9.33+2x(Si1_xAlxO4)6O2 (withx up to ~0.33) and/or RE4Al2(1_X)Si2xO9+x (withx up to ~0.3), which are based on the quasi-binary phases RE9.33(SiO4)6O2 and RE4A12O9, respectively. The former is encountered only in systems with laige RE3+ ions (e.g., La3+), whereas the latter is found in systems with small RE3+ ions (e.g., Yb3+); in systems with medium-sized KE3+ ions (e.g., Gd3+) both types exist Quasi-ternary compounds are known only in the La, Ce, and Sc systems. Severe discrepancies in reported ternary eutectic temperatures led to a need for their accurate redeteimination.
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