EPR, IR and DC conductivity studies of 𝑥CuO�??(100�?����?) Bi2O3 glasses

[摘要] Glass system 𝑥CuOâ€�??(100â€�?�ð�?��?) Bi₂O₃ in the composition range 30â€�??60 mol% of CuO is prepared by melt-quenching technique. The ESR spectra show no hyperfine splittings in parallel part but the peak to peak field width is found to vary with CuO content. The observed ð‘�?? effective values are found to vary with copper oxide. The absence of hyperfine splittings is due to inhomogeneous broadening. The observed IR spectra suggest the presence of Biâ€�?�O bonds. The structure is changing from [BiO₆] octahedral to [BiO₃] pyramidal units with increasing CuO concentration. D.C. electrical conductivity results indicate that the conduction is electron in nature and arises out of adiabatic hopping of polarons. The activation energy is found to be concentration and temperature dependent.

[学科分类] 材料工程

[关键词] Preparation of 𝑥CuOâ€�??(100â€�?�ð�?��?) Bi2O3 glass system;IR and ESR spectra;d.c. ionic conductivity.