A relaxation trend in the electron spin resonance phenomena in copper tellurite glasses containing NiO, CoO and Lu₂O₃

Abstract

Copper tellurite glasses containing NiO, CoO and Lu₂O₃ were prepared by the melt-quenching technique. The composition used was 65TeO₂-(35-x)CuO-xTMO (mol%), where TMO indicates NiO, CoO, Lu₂O₃, and for NiO- and CoO-doped glasses,x has the values 0, 0.5, 1 to 4, and for Lu₂O₃ doped glasses x=0 to 4. Electron spin resonance (ESR) spectra of all glasses were recorded at room temperature. The results on glasses doped with NiO, CoO and Lu₂O₃ are discussed in terms of oxidation-reduction, cross-relaxation and interelectronic repulsion processes, respectively. Cobalt oxide is found to be more effective in relaxing the ESR spectrum than nickel and lutetium oxides when substituted in copper tellurite glasses.