SrBi 4 Ti 4O 15 ceramics samples with different Bi content of which mole radio, n (Sr): n (Bi): n (Ti):,is 1:4(1+x):4(x=-0.05,0,0.05,0.10,0.15,0.20),are prepared by solid-state reaction method.Their structure is analyzed by X-ray diffraction,and their dielectricity and ferroelectricity are measured.Results show that pure SrBi 4 Ti 4O 15 pahase exists in the samples whith x=0.05 and 0.10.The sintered ceramics with x=0.05 have good ferroelectric and dielectric properties:The remnant polarization (2 P r) and coercive field ( E c) are 2.86×10 -9 C·m -2 and 8.65×10 6V·m -1 .The dielectric constant (ε r) changes litter in the range from 1 kHz to 4MHz,and ε r is 425 at the frequency of 1 MHz.
