Abstract
Studies on magnetic susceptibility, electron paramagnetic resonance, electrical conductivity, and dielectric relaxation measurements of β-Na 0.33V 2O 5 bronze powders and films obtained by the sol-gel process are presented. According to magnetic susceptibility measurements, the V 4+ ions occupy 56% of the V 1 sites and 11% of the V 3 sites and it is shown by EPR studies that the bipolaron model describes the electronic properties of the bronze as in the case of the bronze obtained by solid state reaction. Electrical conductivity and dielectric relaxation measurements have also shown that this method of preparation does not affect the electronic transport properties, which can be interpreted in terms of a collective motion of bipolarons with a correlation time of 10 −11 sec.
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