Study on the Chemical Bond Propertiesin Pr_1-xK_xMnO₃ （0.0 ≤ x ≤0.15）

Chemical bond properties of Pr_1-xK_xMnO₃ have been studied using semiempirical method. This method is the generalization of the dielectric description theory delivered by Phillips,Van Vechten and Levine. The results indicate that with the increasing K doping level, the bond covalencies of Pr-O and K-O slighhy decrease, whereas those of Mn-O increase. The bond covalencies of Mn-O is larger than those of Pr-O and K-O. The bond susceptibilities show above regularity as well. This is in good agreement with the experimental fact that the bond distance of Mn-O bond is shorter than those of Pr（K）-O. The macroscopic linear susceptibility slightly decreases With the increasing K doping level.