Authors: Wen Wang, Hai Jun Niu, Heng Ze Xian, Jian Li Yang, Hua Ke, Yu Zhou
Abstract: In this research, SrBi2+xTa2O9 (SBT) powders with different Bi content were prepared
using conventional solid-state reaction method. The SrBi2+xTa2O9 ceramics (x=0 ,0.2 ,0.4 ,0.6)
were fabricated by the cold isostatic compaction and sintering in the air. Microstructure and dielectric,
ferroelectric properties of SBT ceramics were investigated by XRD, SEM, EDAX and dielectric
tester. The effects of Bi content on dielectric, ferroelectrc properties in SBT ceramics were discussed.
Abstract: The interaction of spin, ferroelectric and elastic subsystems is investigated in antisegnetoantiferromagnetic crystal depending on the magnetic and electric fields, and also on an external mechanical pressure. It is shown that the magnitude of the magnetoelectric interaction increases with the rise of an external magnetic field and decreases with increasing external electric field.
Authors: Hui Xian Wang, Wei Li Zhu, Li Ben Li, Qing Dong Chen
Abstract: BiFeO3 (BFO) film is considered as relaxor ferroelectric film with a leakage current, and Bi3.25La0.75Ti3O12 (BLT) film is regarded as ferroelectric film with a leakage current. Maxwell- Wagner (M-W) theory has been used to study the dielectric relaxation behavior of BiFeO3 (BFO)/Bi3.25La0.75Ti3O12 (BLT) films grown on Pt/Ti/SiO2/Si substrate. Results show that the characteristics of BFO film significantly affect the dielectric relaxation behavior of the BFO/BLT film. The theoretical results agree well with the experimental data when the temperature is above 400K. It is inferred that the polycrystalline orientation of BFO film leads to the presence of disorganized polar nanoregions (PNRs) in BFO film. And BFO film exhibits relaxation characteristics at high temperatures.
Authors: L.L. Li, Qiu Xiang Liu, Yan Zou, Xin Gui Tang, Yan Ping Jiang
Abstract: Bi0.9Nd0.1FeO3 (BNFO) films were deposited on Si (100) and (La,Sr)(Al,Ta)O3 (100) (LAST) substrate by radio frequency (RF) magnetron sputtering method respectively. The structure，morphology and magnetic properties were studied. X-ray diffraction (XRD) result indicates that the BNFO films on different substrate adopted different orientation. Cross-section scanning electron microscopy shows that the film thickness is 145 nm．Magnetic properties measurement shows that the film on Si(100) substrate has the larger saturation magnetization (Ms) of 3 686 emu/cm3, while the Ms value of the BNFO films on LSAT(100) substrate is only 1 213 emu/cm3.