Low temperature dielectric properties and NTCR behavior of the BaFeNbO double perovskite ceramic.

The double perovskite-structured barium iron niobate (BaFeNbO, BFN), a lead-free ferroelectric, shows a very high dielectric constant value. We report here the temperature dependent dielectric permittivity, impedance and electric modulus behavior of the BFN ceramic studied between 300 K and 20 K. The phase-pure BFN powder sample was synthesized using a conventional solid state reaction route.