Subsolidus phase relations in the systems K2O–ZnO–AO3 (A = Mo, W)

The subsolidus phase relations of the systems K2O–ZnO–AO3 (A = Mo, W) have been investigated by X-ray diffraction (XRD) analyses. The phase diagrams have been constructed. There are six binary compounds and two ternary compounds in the K2O–ZnO–MoO3 system, it can be divided into 11 three-phase regions. The K2O–ZnO–WO3 system consists of six binary compounds and one ternary compound. This system can be divided into 9 three-phase regions. DTA results indicated the compounds K2MoO4 and K2WO4 are not suitable to be fluxes for ZnO crystal growth.