Abstract: It was found with electron-spin-resonance(ESR) that the doped silver is Ag⁺,and no ESR signal or Ag²⁺ was observed in ZnS crystallite. With ESR of probe ion Mn²⁺ and X-ray diffraction analysis, it was found that a structure phase transformation from cubic lattice(β phase) to hexagonal(α phase) in ZnS crystallite is affectd by doped amount of Ag⁺ ion and calcination temperature. There is a reverse transformation phenomenon when Ag⁺ doped amount is 5×10^-4g/g and at 1100℃-1200℃.The Landé factor g of α phase is 2.006,the hyperfine constant a is 6.76mT,the g of β is 2.002,a is 6.81 mT from ESR of the Mn²⁺.

Key words: Zns:Ag crystallite, ESR of Mn²⁺, Structure phase transformation, Reversed transformation