To seek new hybrid improper ferroelectricity,Sr3Sn2O7 ceramic with Ruddlesden-Popper phase was prepared by the conventional solid-state reaction method. The phase purity was characterized by X-ray diffraction,and the microstructure and composition were analyzed by scanning electron microscopy and energy dispersive system. The dielectric constant as the function of the temperature at different frequencies showed a dielectric peak at about 132 ℃ ,and the polarization-electric field measurement at room temperature showed a typical hysteresis loop. The results indicate that Sr3Sn2O7 ceramic has an orthorhombic structure with a=2.06272 nm,b=0.57249 nm and c=0.57003 nm. The dielectric temperature spectra at different frequencies exhibit a dielectric peak at about 132 ℃. Meanwhile, a typical ferroelectric hysteresis loop reveals significant room temperature ferroelectricity and its Curie temperature is about 132℃.%为了寻求新的混合非常规铁电体,采用固相法合成了具有Ruddlesden-Popper结构的Sr3Sn2O7陶瓷,并研究了该材料的介电与铁电性能.通过X射线衍射分析检测Sr3Sn2O7的相组成,采用扫描电镜与能谱分析仪分析Sr3Sn2O7陶瓷的微观形貌与元素含量,采用不同频率下的介电温谱测量和电滞回线测量对样品的介电与铁电性能进行表征.结果显示,制备的Sr3Sn2O7陶瓷为单一正交相结构,其晶胞参数a=2.06272 nm,b=0.57249 nm,c=0.57003 nm,样品在不同频率下测得的介电温谱在132℃存在一个明显的介电峰,同时其电滞回线显示明显的室温铁电性,居里温度约为132℃.
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