Interest in Potassium Fluoro Antimonate crystals have been increased for the last four decades due its superionic conduction and its unusual electro-optic properties. The title compound KSb4F13 crystal has been grown by slow evaporation technique at room temperature. The crystalline perfection was analyzed by powder X-ray diffraction method. From single crystal X-ray diffraction, it has been found that it belongs to tetragonal crystal system with a space group 14/m. The presence of functional groups were identified by FTIR spectral analysis. The microhardness studies indicate that the KSb4F13 crystal is a moderately softer substance. It showed that the given crystal exhibit reverse indentation size effect (RISE). The dielectric and A.C. conductivity studies have been carried out at different frequencies with different temperatures , and the results analyzed.
