Effect of Zn–Ti double substitution on the electrical properties of Bi₄V₂O₁₁

Abstract

New samples of the Bi₂Zn_0.1–xTi_xV_0.9O_5.35+x; 0.02 ≤ x ≤ 0.08 system have been synthesized through a standard solid-state reaction route. XRD analysis and differential thermal analysis have been used to characterize the phase structure of samples. The γ′ phase is stabilized to room temperature in all investigated samples. The electrical properties of the BIZNTIVOX system have been studied by using AC impedance spectroscopy. An AC impedance response as a function of frequency (20 Hz–1 MHz) has been used to investigate the electrical conductivity and the dielectric permittivity in the temperature range of 150 °C–700 °C. In this temperature range, the phase transition γ′ to γ has been observed in all the compositions studied. AC impedance spectroscopy indicates that the resistance of samples decreases with increase of temperature. The ionic conductivity of samples appeared as a two-line region in Arrhenius dependence. At 300 °C, the highest ionic conductivity is shown by the composition x = 0.05 (σ₃₀₀ = 1.35 × 10⁻⁴ S cm⁻¹).

Keywords:

• oxides
• superconductors
• X-ray diffraction
• electrical properties
• phase transition

Acknowledgements

We are highly grateful to the Chairman, Department of Chemistry, Aligarh Muslim University, for providing requisite research facilities.

Disclosure statement

No potential conflict of interest was reported by the authors.