Effect of sintering temperature on structural, dielectric, and electrical property studies of Bi_4NdTi_3FeO_(15) aurivillius ceramics

摘要

The effect of sintering temperature on the structural, magnetic, dielectric, and electric properties of four-layered Bi_4NdTi_3FeO_(15) Aurivillius multiferroic ceramics was studied. The ceramics was prepared by conventional solid-state reaction. The Rietveld refined room temperature (RT) X-ray diffraction and Raman studies revealed that the samples exhibited an orthorhombic structure with A_21am space group. The surface morphology studies indicated that the samples exhibited non-uniform and randomly oriented plate-like grains. The P-E hysteresis loops of the samples showed an unsaturated polarization even at a high field of 90 kV/cm, indicates weak ferroelectric at RT. Room temperature magnetization curves indicate weak antiferromagnetic nature with remanent magnetization ～ 4 memu/g. The M-H loops at low temperature 10 K showed the ferromagnetic nature. The temperature dependence of dielectric and impedance data showed a dielectric relaxation which could be ascribed to short-range movements of oxygen vacancies.