Effect of Holmium Doping in Ba₅RTi₃V₇O₃₀ (R = Rare Earth Element) Compound

Abstract

Polycrystalline Ba₅HoTi₃V₇O₃₀ compound has been prepared by solid-state reaction technique. Compound is found to be single phase by XRD studies. SEM study indicates average grain size to be ∼3 μm. Dielectric studies carried out in temperature regime RT-773 K and frequency range 1 Hz-100 kHz, show ferroelectric phase transition at 550 K at 100 kHz. The impedance spectra show three distinct regions in temperature range 543–663 K corresponding to electrode polarization, grain boundary and grain interior contributions and indicate ionic behavior. The activation energy has been evaluated following Arrhenius equation to be 0.51 eV.

Keywords:

• Doping
• Impedance analysis
• dielectric permittivity
• Arrhenius equation and conductivity

Acknowledgment

Authors thank Director, NERIST to permit to carry out research work and for his encouragement and help. We are grateful to the CRF of IIT, Kharagpur and Dr S. R. Shanigrahi (IMRE, Singapore) for their help in carrying out SEM and XRD, respectively.