Ferroelectric and dielectric properties of Mo-doped SrBi 4 Ti 4 O 15 ceramics

The ferroelectric ceramics samples of SrBi 4-x/3 Ti 4-x Mo x O 15 (x=0.00, 0.003, 0.012, 0.03, 0.06, 0.09) have been prepared by the conventional solid-state reaction method. X-ray diffraction analysis shows that the crystal structure of SrBi 4 Ti 4 O 15 (SBTi) is not affected by Mo-doping. The scanning electronics microscope (SEM) images indicate that all the samples consist of sheet grains and the grain size is reduced by Mo-doping while the ferroelectric properties are improved significantly. The remanent polarization (2P r ) increases at first，then decreases with the increasing Mo content. At x=0.06, the 2P r maximizes at a value of 26.5 μC/cm 2 , which about 117% higher in comparison with that of SBTi. And the coercive field of SBTi is increased only about 20%. The Curie temperature of the samples varied slightly after doping, which implies that the good thermal stability of SBTi is not sacrificed.