Preparation And Properties Of B-site Doped Bismuth Layered-structure Ferroelectric Ceramics By Molten Salt Method

Bismuth-layered structure ferroelectric?BLSFs?is based on its anti-fatigue properties is better,and the material does not contain lead pollution is an ideal iron-voltage electrical materials.Because of the simultaneous ferroelectricity and ferromagnetism,and can achieve the mutual coupling between magnetic and electrical coupling,and thus in the multi-state storage has a greater application potential.This type of material is a new type of multifunctional material,in the quantum spin components,magnetoelectric devices,and sensors have great potential.At present,there are many reports on this aspect,the research is mainly focused on the experimental method and performance improvement in two aspects.In this paper,we focus on the study of ferroelectric and ferromagnetic properties of BLSFs and the experimental process.It is not many of the experimental reports on the molten salt method.We mainly use the molten salt method to prepare texture ceramics.We focus on the effect of Ni incorporation on the properties of Co,Fe,Cr and Mn.In the ceramic A-site quantitative incorporation of Nd,on the one hand can inhibit the A-bit Bi volatilization,but also affect the electronic transport,the main contents of this paper are as follows:?1?BNTF-Ni_x ceramic samples with 4-layer structure were prepared by molten salt method.The results show that the incorporation of Ni does not change the crystal structure of the material.With the increase of Ni content,Ni can not completely replace Fe.Magnetic properties have a certain magnetic anisotropy,in the plane?magnetic field and c-axis angle zero?magnetic performance than the outer surface?magnetic field and c-axis perpendicular?magnetic performance is better,in 2Mr,2Ms are with the Ni content first The results show that both the values of the BNTF-Ni_0.3 samples are the largest,and the dielectric properties of the four components on the four components are stable at room temperature,and the maximum is 376,the smallest 301.Dielectric losses are relatively small,the largest 0.036,the smallest 0.013.Comprehensive comparison of BNTF-Ni_0.3 sample performance is better.?2?The effect of different molten salt ratio on the properties of the ceramic structure was compared.The results showed that the porosity of the ceramic was the largest when the ratio of molten salt was 1,and the degree of orientation was 0.786.The comprehensive results could be seen the ceramic prepared by the molten salt method has the characteristics of preferential growth,and the degree of orientation of the ceramic samples prepared by the four different molten salt ratios is above 0.7.The degree of differentiation of the molten salt ratio is not so much difference between the surface of the magnetic surface,respectively.?3?The effect of different temperature on the structure and properties of the ceramic,the temperature increase in the ceramic texture is reduced.SEM results can be seen in the grain arrangement in the further chaos.There is a difference in the outer orientation of the ceramic sample surface,so the difference of magnetocrystalline anisotropy with temperature is also changed,M_s is related to the change of M_r.The hysteresis loop shows that the saturated polarization intensity decreases gradually with the increase of temperature.There is a certain leakage current in all samples,and there are some defects in the sample.?4?When the number of perovskite layers in the ceramic crystal structure is increased,the ceramic grain has a great influence on the number of the perovskite structure?n?,and 2M_s=2670.15 memu/g of the ceramic at n=5,2M_r=742.19 memu/g have reached the maximum,n=4 and n=6 magnetic properties are almost,n=7 of the magnetic parameters of the rapid decline in the magnetic coupling mechanism has undergone significant changes.In the dielectric properties,the dielectric constant values of all the different layers are not changed,but the dielectric constant does not reach equilibrium in the frequency range of n=5,and the dielectric constant of n=4 It is relatively high;different layers of the dielectric loss of the same law in the frequency of high values are relatively small.