Abstract
(V2O5)100-xSex (x = 9, 17, 25, 30 wt %) alloys have been prepared by quenching the melt from 1000 to 273 K in ice water. The XRD data show the presence of crystalline V2O5, V6O13, VO2, and Se phases. High-resolution XPS spectra for a Se 3d peak show the presence of SeO2 and elemental Se phases in the samples. The presence of a reversible endothermic peak ≈343 K in the differential scanning calorimetric (DSC) curve of quenched samples is indicative of the monoclinic to tetragonal transformation in VO2. A selenium melting peak at 495 K is also present in the DSC curve, for x ≥ 17. Room-temperature dielectric measurements in the frequency range 1 Hz to 100 kHz show the presence of negative permittivity in samples with x < 30. Permittivity Vs temperature and loss-factor Vs temperature measurements in the temperature range 273−373 K and at a fixed frequency of 1 kHz were reversible with hysteresis across the monoclinic to tetragonal transformation of VO2. A sample with x = 30 exhibits a minimum temperature ran...
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