Ferroelectric,magnetic,and optical properties of Aurivillius compound Bi_(5)FeTi_(2.5)Co_(0.5)O_(15)  

作　　者：Hui Sun Yuying Wu Xi Xie Yuxi Lu Tianshu Yao Jiansheng Zhong Xiaobing Chen 

机构地区：[1]College of Physics Science and Technology,Yangzhou University,Yangzhou,225002,China [2]Guangling College of Yangzhou University,Yangzhou,225002,China

出　　处：《Journal of Materiomics》2018年第4期353-359,共7页无机材料学学报（英文）

基　　金：the National Science Foundation of China(Grant No.51402256 and Grant No.11374227);Natural Science Foundation of Jiangsu Province,China(No.BK 20161409);the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province,China(Grant No.12KJB140013).

摘　　要：Bi_(5)FeTi_(2.5)Co_(0.5)O_(15)(BFTC)ceramics was successfully synthesized using the sol-gel method.It exhibits simultaneously visible-light response,ferroelectric and weak ferromagnetic orders at room temperature.The narrow band gap of 2.06 eV was determined via the UVevis diffuse absorption spectrum.The x-ray photoelectron spectroscopy results show that the Fe ions in the samples is 3 t and 2 t valence states while the doped Co ions is 2 t valence state.The BFTC sample undergoes a ferromagnetic-like transition at~552 K.Weak ferromagnetism is mainly due to spin-canting of Fe-based and Co-based sublattices via Dzyaloshinskii-Moriya(DM)interaction.Dielectric loss and dielectric modulus exhibit the characteristics of dielectric relaxation,which can be ascribed to oxygen/vacancy hopping.These results reveal many potentially useful physical phenomena and open a new avenue to design of novel solar-energy conversion devices and multiferroic applications.

关 键 词：Aurivillius phase Weak ferromagnetism Optical properties CO-DOPING 

分 类 号：TG1[金属学及工艺—金属学]