Facile route to prepare grain-oriented multiferroic Bi7Fe3−xCoxTi3O21 ceramics
Facile route to prepare grain-oriented multiferroic Bi7Fe3−xCoxTi3O21 ceramics
复制标题
DOI：
10.1016/j.jeurceramsoc.2015.05.032
复制
发表时间：
2015-11
影响因子：
5.7
通讯作者：
Xiaoning Li;Zhu Zhu-Zhu;Feng Li;R. Peng;X. Zhai;Z. Fu;Yalin Lu
中科院分区：
文献类型：
--
作者：
Xiaoning Li;Zhu Zhu-Zhu;Feng Li;R. Peng;X. Zhai;Z. Fu;Yalin Lu
采用一种简便的方法制备了具有高度[0+0+1]择优取向的微米级−陶瓷。该制备方法包括在较低的轴向压力(10 Mpa)下干压高纵横比的纳米板，然后在没有施加压力的情况下在高温下烧结绿色压坯。研究了其形成机制及Co掺杂对其取向的影响。结果表明，BFCTO颗粒的取向度取决于纳米片状粉末的长径比，其长径比随Co掺杂量的增加而增大，Bi7Fe2CoTi3O21陶瓷的取向度最高可达0.91。当取向颗粒表面垂直于外加磁场方向时，其饱和磁化强度(2ms)值较大，表现出明显的各向异性。这种制备方法为制备具有良好磁性能的颗粒取向复合氧化物陶瓷提供了一种既经济又方便的方法。
A facile route was developed to fabricate Bi7Fe3−xCoxTi3O21(BFCTO) ceramics in which the micrometer sized grains were highly [0 0 1] oriented. The preparation involved dry pressing nanoplates with high aspect ratio under low axial pressure (10 MPa), and subsequently sintering the green compact at high temperature without applied pressure. The formation mechanism and the effects of Co doping on the orientation were investigated. The results indicated that the orientation degree of BFCTO grains was depended on the aspect ratio of nanoplate powder, which increased with the increase of doping amount of Co. The degree of orientation was achieved as high as 0.91 in Bi7Fe2CoTi3O21ceramic. The saturation magnetization (2 Ms) values were larger when surfaces of the oriented grains were perpendicular to the direction of applied magnetic field, indicating obvious anisotropic magnetism. This fabrication method provided an economical yet convenient approach to manufacture grain-oriented complex oxide ceramics with improved magnetic property.