Mild solvothermal synthesis of complex fluorides Li2BeF4 and LiSrAlF6

The complex fluorides Li2BeF4 and LiSrAlF6 were synthesized solvothermally at 180–240 °C and characterized by means of X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), thermogravimetric analysis (TGA), infrared spectroscopy (IR) and X-ray photoelectron spectroscopy (XPS). The different influence factors such as solvents, molar ratios of initial mixtures, reaction temperature and reaction time were investigated. The experimental results indicated that Li2BeF4 and LiSrAlF6 powders could be controllably synthesized in the solvothermal process.