【多功能陶瓷】铋层状结构化合物

Ferroelectric,magnetic, and optical properties of Aurivillius compound Bi₅FeTi_2.5Co_0.5O₁₅

Aurivillius 化合物Bi₅FeTi_2.5Co_0.5O₁₅的铁电，铁磁和光学性能

 Authors: Hui Sun, Yuying Wu, Xi Xie, Yuxi Lu,Tianshu Yao, Jiansheng Zhong, Xiaobing Chen

Volume 4, Issue 4, Pages 353-359

       磁滞回线和紫外可见光吸收光谱

Bi₅FeTi_2.5Co_0.5O₁₅ (BFTC) ceramics was successfully synthesized using the sol-gel method. 

采用溶胶凝胶法成功制备了Bi₅FeTi_2.5Co_0.5O₁₅(BFTC)陶瓷。

It exhibits simultaneously visible-light response, ferroelectric and weak ferromagnetic orders at room temperature.

这一材料在室温时同时表现出了可见光响应，铁电和弱铁磁有序性。

The narrow band gap of 2.06 eV was determined via the UV–vis diffuse absorption spectrum. 

通过紫外-可见漫反射吸收光谱确定其具有2.06 eV的较窄带隙。

The x-ray photoelectron spectroscopy results show that the Fe ions in the samples is 3 + and 2 + valence states while the doped Co ions is 2 + valence state. 

X射线光电子能谱结果表明，样品中的Fe离子为3 +和2 +价态，而掺杂的Co离子为2 +价态。

The BFTC sample undergoes a ferromagnetic-like transition at ∼552 K. 

BFTC样品在〜552 K处经历类铁磁相变。

Weak ferromagnetism is mainly due to spin-canting of Fe-based and Co-based sublattices via Dzyaloshinskii-Moriya (DM) interaction. 

弱铁磁性产生的主要原因是Fe基和Co基亚晶格通过Dzyaloshinskii-Moriya（DM）相互作用机制进行的自旋倾斜。

Dielectric loss and dielectric modulus exhibit the characteristics of dielectric relaxation, which can be ascribed to oxygen˗vacancy hopping. 

介电损耗和介电常数表现出介电弛豫的特性，这是氧空位跃迁造成的。

These results reveal many potentially useful physical phenomena and open a new avenue to design of novel solar-energy conversion devices and multiferroic applications.

这些结果揭示了许多潜在的物理现象，开辟了设计新型太阳能转换器件和多铁材料应用的新途径。

文中部分图片：

物相组成和形貌

Fig. 1. (a) XRD patterns and (b) surface SEM image of the BFTC ceramic sample.

铁电性能

Fig. 3. (a) Room-temperature ferroelectric hysteresis loop of BFTC sample under an applied electric field of 190 kV/cm. (b) Plot of ± ΔP_r versus the testing electric field in a standard PUND measurement.

温度和磁性的关系

Fig. 4. (a) Temperature dependence of magnetization of the BFTC from 300 K to 650 K. The inset shows the plot of dM/dT. The solid line is a fit based on the Curie-Weiss law. (b) Temperature dependence of magnetization in the ZFC and FC modes of the sample for the range of 5 K–300 K.

温度和介电性能的关系

.Fig. 6. Temperature dependence of the dielectric constant and dielectric loss of BFTC at the frequency from 1.07 to 41.02 kHz. The inset in Fig. 6 (a) is the Arrhenius plot for relaxation frequency vs. temperature.

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陈小兵教授和孙慧副教授带领的研究团队完美地揭示了一种Aurivillius化合物的铁电、铁磁和光学性能，让我们来认识下孙慧副教授吧！

Dr. Hui Su is currently an associate professor at College of Physics and Technology, Yangzhou University. She received her master degree and doctor degrees in Condensed Matter Physics from Yangzhou University in 2006 and Nanjing University in 2013. Her primary scientific interests cover the fields of multiferroic and photocatalytic materials, and ceramics and thin films processing.