Abstract
A continuous series of Bi 4Ba x V 2– x O 11–(3 x/2)– δ solid solutions are prepared by conventional solid state reactions. The polymorphism and electrical properties of these samples are studied by FT-IR spectroscopy, X-ray diffraction, differential thermal analysis (DTA) and AC impedance. The solid solutions with composition 0.07≤ x≤0.13 are isostructural with the monoclinic phase α-Bi 4V 2O 11. However, orthorhombic β-phase is observed for x=0.17 and tetragonal γ-phase is stabilized for x≤0.30. X-ray and DTA results reveal the occurrence of α↔γ transition for x≤0.13, β↔γ transition for x=0.17 and γ′→γ transition for x≥0.20. AC impedance plots at 280 °C for all compositions show greater contribution of grain to ionic conductivity than grain boundary. The highest ionic conductivity, σ 300 °C =4.456×10 –5 S cm –1 is observed for x=0.17. The ionic conductivity of the substituted compounds is higher than the parent α-Bi 4V 2O 11, due to the increased oxygen ion vacancies generated as a result of barium doping.
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