Abstract
The preparation of copper nitrate doped tellurate glasses by sol- gel method and spectroscopic studies of this tellurate system are reported. FTIR spectroscopy results show that this glass consists of [TeO6], [TeO4] and [TeO3] structural units and indicate that six- coordinated tellurium (VI) in [TeO6] units were partially changed to fourcoordinated tellurium (IV) in [TeO4] units during the doping with Cu(NO3)2. EPR spectra of the studied glasses were obtained due to the presence of Cu2+ paramagnetic ions and reveal the local order in matrix, the distribution and valence state of cooper ions. Thus, the EPR spectra show a partially resolved parallel hyperfine structure and no resolved perpendicular structure. The EPR spectra could be a superposition of two signals, one due to isolated Cu2+ ions in axial neighborhood, and the other due to the presence of magnetically coupled Cu2+ species.
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