Flux growth of KGaP_2O_7 single crystals

摘要

Transparent potassium gallium pyrophosphate single crystals, KGaP_2O_7, have been grown by a spontaneous nucleation method using K_4P_2O_7-4KPO_3 as flux. The as-grown crystals were characterized by X-ray powder diffraction (XRPD), differential thermal analysis (DTA) and thermo-gravimetric analysis (TGA) techniques. The results show that the as-grown crystals were well crystallized and indexed in a monoclinic crystal system with space group P2_1/c. The crystal is stable in the measurement temperature range of 25-939.9℃, and it melts congruently at 947℃. The frequencies of the vibrational modes of the crystal were also obtained from measurements of the infrared spectrum.