ESR and photoacoustic spectra of V2O5?MO2 (M = Se, Te, Ge) glasses |
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Authors: | CS Sunandana AK Bhatnagar |
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Institution: | School of Physics, University of Hyderabad, Hyderabad 500 134, India |
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Abstract: | ESR spectra of V2O5?MO2 (M = Ge, Se, Te) glasses are investigated in the range 298–498 K. The spectra at 298 K are characteristic of V4+ with the 3d1 electron localized on a single ) in the glass network. At higher temperature, the hyperfine structure progressively broadens, leading eventually to a broad, single ESR peak. These results are consistent with thermally-induced electron hopping from V4+ to V5+. Photoacoustic spectra of the glass at 298 K are characteristic of V4+ in a distorted octa environment. A correlation of ESR and PAS data suggests that covalency increased as M is charged from Ge through Te to Se. |
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