NIOBIUM DOPED BARIUM BISMUTH-TITANATE CERAMICS

Abstract

Ferroelectric materials with diffuse phase transition (DPT) charactreristics and/or relaxor properties have been exstensively studied in the last few decades mainly due to their very interesting and still not completely explained physical properties. According to that, the aim of our work is to investigate how niobium (Nb5+) as donor dopant influences on microstructure and electrical properties in relaxor BBT ceramics. Dense pure and doped BaBi4Ti4-5/4xNbxO15 (BBNT) ceramics (x = 0, 0.05, 0.15, 0.30 mol) ceramics were prepared by conventional solid state reaction from appropriate oxide mixture. Dielectric properties were investigated in a wide range of temperatures and frequencies (Fig. 1). It is indicated that the temperature of dielectric constant maximum (Tm) of BBNT specimens significantly decreases with the increase of niobium content.