新型Ruddlesden-Popper相Sr_3Sn_2O_7陶瓷铁电体  

New Ceramic Ferroelectric Sr_3Sn_2O_7 with Ruddlesden-Popper Phase

作　　者：黄昌蓉[1,2] 徐军[1,2] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430205 [2]等离子体化学与新材料湖北省重点实验室(武汉工程大学),湖北武汉430205

出　　处：《武汉工程大学学报》2017年第3期239-242,共4页Journal of Wuhan Institute of Technology

摘　　要：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=2.062 72 nm,b=0.572 49 nm,c=0.570 03 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℃.To seek new hybrid improper ferroelectricity, Sr3Sn207 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=2.062 72 nm, b=0.572 49 nm and c=0.570 03 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 ℃.

关 键 词：Sr3Sn2O7 铁电陶瓷 居里温度 介电性能 

分 类 号：TM911.3[电气工程—电力电子与电力传动]