Abstract
In the present study, sol–gel citrate route was utilized to synthesize BIALVOX (Bi 2Al x V 1− x O 5.5− x− δ ) in the composition range 0 ≤ x ≤ 0.20. Powder X-ray diffraction and simultaneous thermogravimetric and differential thermal analyses confirmed that the calcination of BIALVOX xerogels is fully completed at around 500 °C after 3 h of thermal treatment. It has been found that the stabilization of highly conducting γ-phase takes place for x ≥ 0.10. AC impedance spectroscopic investigation suggested that the charge accumulation at grain boundaries is more pronounced as compared to that at grain interiors. However, the maximum electrical conductivity (7.73 × 10 −5 S cm −1) was noticed for BIALVOX.13 at 300 °C. The temperature dependence of dielectric permittivity was also reported.
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