Properties of Nb- and Mo-modificated SrBi4Ti4O15 ferroelectric ceramics

An investigation on the ferroelectric and dielectric properties of higher-valent-cations Nb- and Mo-modificated SrBi4Ti4O15 ceramics was presented. The ferroelectric property of SrBi4Ti4O15 was both obviously improved by niobium and molybdenum doping. The remnant polarization (2P(r)) of both Nb- and Mo-modificated SrBi4Ti4O15 increases at first, then decreases with further doping. As the doping content is 0.03 and 0.06 respectively, the 2P(r) maximizes at a value of 24.7 mu C/cm(2) and 26.5 mu C/cm(2), which is about twice larger than that of SrBi4Ti4O15. Meanwhile, the coercive field is increased less than 20% upon Nb and Mo substitution. The Curie temperature of the samples shifted hardly by Nb- and Mo-doping, which indicates that the good thermal stability of SrBi4Ti4O15 is not affected.