Study on BaB 2 O 4 -Na 2 B 2 O 4 -K 2 B 2 O 4 Ternary System

The phase diagram of B 2 O 4 -Na 2 B 2 O 4 -K 2 B 2 O 4 ternary system has been studied by combination of experimental measurement with theoretical calculation.On the basis of selfconsistent thermodynamic analysis of three sub-binary phase diagrams,the optimized the- rmodynamic data of these sub-binary systems are extrapolated to ternary system by asymmet- rical Toop approach,and the B 2 O 4 -Na 2 B 2 O 4 -K 2 B 2 O 4 ternary phase diagram is calculated. In comparison with a measured typical vertical section,the calculated ternary phase diagram is quite satisfactory.