Chemical Bond and Polar Behavous on Complex Fluoride of Cubic Perovskite Structure

By using the concept of bonding subformula equation and efficient charge of valent electron, the chemical bond parameters, the properties of bond, the ionic raduii and electronic polarizabilities in KMF₃（M=Mg, Mn,Co,Ni,Zn） crystals of cubic perovskite type were calculated in detail. The results show that the F ions are deformed in crystals, the laws of deformation agree with laws of the electronic polarizabilities of F ions and covalency of bond in various crystals.