Electricalconductivity and Dielectric Properties of Bi 0.5 (Na 0.7 K 0.2 Li 0.1 ) 0.5 TiO 3 Ceramic Material

Abstract

Solid state reaction route is used by adopting calcination, dry pressing and sintering for the preparation of polycrystalline Bi0.5(Na0.7K0.2Li0.1)0.5 TiO3(BNKLT) material. Studies of dielectric and conductivity parameters of the ma- terial were studied as a function of frequency(45Hz to 5MHz) and temperature(RT-600℃). At higher temperatures the conductivity curves were found to be merging, due to the effect of release of space charge.The conductivity parameters such as ion-hopping rate (ωp), fitting parameters (n(T), A(T)) and the charge carrier concentration(K ' ) terms have been calculated using Almond and West formalism.A strong dispersion in both the components of complex dielectric constant, appear to be a common feature in ferroelectrics associated with good ionic conductivity and is referred to as the low frequency dielectric dispersion(LFDD).This offered an opportunity to obtain a good candidate for replacing the lead based ceramics.