Effect of Sintering Temperatures and Ba/Ti ratio on Dielectric Properties of BaTiO_3 Ceramic

摘要

As a research object, the samples with various Ba/Ti ratios (Ba/Ti=0.95～1.05) were synthesized by solid phase reaction method. Effect of sintering temperatures and Ba/Ti ratio on dielectric properties and crystal structure of BaTiO_3 ceramic were investigated. Crystal structure and crystal phase composition were investigated by scanning electron microscopy and X-ray diffraction. The dielectric properties were studied by Agilent 4294A at 1 kHz. The results show that the BaTiO_3 ceramic has high permittivity and dielectric loss at 1340°C. The permittivity of BaTiO_3 ceramic with Ba/Ti=0.95 change small as the sintering temperatures vary at 1320°C. With the increasing of Ba/Ti ratio, the Curie temperature first increases and then decreases as the sample sintering at 1320°C. When Ba/Ti=1, the Curie temperature increase with the sintering temperature increasing.