Abstract
EPR and optical absorption studies on Fe 3+ and Mn 2+ doped strontium tetraborate (SrB 4O 7) glasses are carried out at room temperature. The EPR spectrum of the Fe 3+ doped glass consists of signals with g-values 9.04, 4.22 and 2.04, whereas the EPR spectrum of Mn 2+ doped glass exhibits a characteristic hyperfine sextet around g=2.0. The spectroscopic analyses of the obtained results confirmed distorted octahedral site symmetry for the Fe 3+ and Mn 2+ impurity ions. Crystal field and Racah parameters evaluated from optical absorption spectra are: Dq=790, B=700 and C=3000 cm −1 for Fe 3+doped glass and Dq=880, B=700 and C=2975 cm −1 for Mn 2+ doped glass.
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