Influence of Susceptibilities and Covalency on Sn4+ and I- Mossbauer isomer shifts

By using the chemical bond theory of dielectric description，the Sn4 + ，I- Mossbauer isomershifts is studied. A linear relationship between the isomer shifts and the chemical surrounding factor h definedby the covalency of chemical bond fcμand the polarizabilitie of ligand bond volumeαLμis achieved：δ=δ0 + bh，h =（Σμ αLμfcμ）1 / 2 .