Precise Determination of the MgAlON／（A1N＋MgA1ON） Phase Boundries in the MgO-A1N-A12O3 Ternary System at 1600℃ and 1700℃

The accurate phase boundary of MgAION/(AIN+MgAION) in MgO-AIN-Al2O3 ternary system, has not been determined precisely so far. In the present study, the lattice parameters of MgAION solid solution with various compositions were determined precisely with X-ray powder diffraction. According to the relationship between the lattice parameters of MgAION solid solution and the contents of AIN and MgO, the phase boundaries of MgAlON/(AIN+MgAlON) inMgO-AlN-Al2O3 ternary system at 1600℃ and 1700℃ were precisely determined.