EPR studies of the oxyfluoride glass ceramics using Mn²⁺ as a paramagnetic probe

In this work, we used Mn²⁺ as a dopant in the oxyfluoride glasses with various fluoride compounds. Electron paramagnetic resonance (EPR) measurements were carried out before and after a heat treatment of the material. In both cases, a well pronounced hyperfine (hf) structure of the EPR spectra characteristic to the Mn²⁺ ion have been observed. EPR measurements have also been studied for the separate fluoride counterparts of the oxyfluoride glasses. EPR spectra of the LaF₃:Mn²⁺ and CaF₂:Mn²⁺ powders show that Mn²⁺ ion has a strong superhyperfine (shf) interaction with surrounding fluorine nuclei, and this shf structure could be observed also in the heat treated glass samples.