中文摘要：

研究50nm BaTiO3陶瓷的铁电性能、介电性能的温度依赖性，其介温谱和介电损耗谱具有明显的弥散相变特征，当频率为1kHz时计算得到弥散指数y为1．60。不同温度下的介电常数-电场强度（ε-E）曲线显示，介电异常发生在110～120℃的温度范围内，110℃时的介电可调性为20．2％，介电损耗小于O．02。压电位移曲线计算得到50nm BaTiO3陶瓷的压电系数d33为45pm／V。

英文摘要：

The temperature dependence on the dielectric and ferroelectric properties of dense BaTiO3 ceramic with the nanocrystallines of 50 nm was investigated. The relationship between the dielectric constant and loss tangent with respect to temperature effect was analyzed, and a significant diffuse phase transition was observed. The dispersion parameter was calculated to be 1.60 at 1 kHz. The dielectric constant-electric field （ε-E） loops at different temperatures showed that the permittivity anomalies occurred in a temperature range of 110-120℃. The dielectric constant tunability was 20.2% at 110 ℃, and the dielectric loss tangent was 〈0.02. Moreover, the positive piezoelectric coefficient d33 of 45 pm/V was determined from the slope of the loops.