Ho^(3+)掺杂对BiFeO_3陶瓷材料铁电和铁磁性能的影响  

Effects of Ho^(3+) Doping on Ferroelectric and Ferromagnetic Properties of BiFeO_3 Ceramics

作　　者：宋桂林[1,2] 苏建[1] 周晓辉[1] 胡棚[1] 王天兴[1,2] 杨海刚[1,2] 常方高[1,2] 

机构地区：[1]河南师范大学物理与信息工程学院 [2]河南省光伏材料重点实验室,河南新乡453007

出　　处：《硅酸盐学报》2011年第9期1445-1450,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(60571063);河南省重大科技攻关(09210-2210018);河南省教育厅自然科学基金(2011A140014);河南师范大学青年科研基金(01026400017)资助项目

摘　　要：采用快速液相烧结法制备Bi1-xHoxFeO3(x=0,0.05,0.10)系列陶瓷样品,用X射线衍射仪、扫描电子显微镜、铁电仪和振动样品磁强计测量与分析样品结构、形貌、铁电和铁磁性能。结果表明:所有样品的主衍射峰与纯相BiFeO3相吻合且具有良好的晶体结构,样品晶粒尺寸随着Ho3+的引入而逐渐变小,为1～5μm;在15 kV/cm电场下,Bi0.9Ho0.10FeO3样品的剩余极化强度为0.83μC/cm2,是纯相BiFeO3的12倍;随着Ho3+的掺杂,样品的磁性能显著提高,在磁场为1 000 Oe(1 Oe=79.5 A/m)作用下,Bi0.9Ho0.10FeO3已具有完整的磁滞回线,呈显弱铁磁性能,剩余磁化强度为0.03emu/g(1 emu/g=1 A·m2/kg),饱和磁化强度为0.292 emu/g。Multiferroic Bi1–xHoxFeO3（x = 0,0.05,0.10） ceramics were prepared by rapid liquid phase sintering method.Structure,morphology,ferroelectric and ferromagnetic properties of BiFeO3 ceramics were characterized using X-ray diffractometer,scanning electron microscopy,ferroelectric tester,and vibrating sample magnetometer.Results show that all peaks for samples Bi1–xHoxFeO3 are indexed according to the crystal structure of pure BiFeO3 and grain sizes from 1 μm to 5 μm are observed for BiFeO3 samples doped with Ho3＋.A saturated polarization–electric field hysteresis loop was obtained for samples Bi0.9Ho0.10FeO3 with a large remanent polarization of 0.83 μC/cm2 at magnetic field of 1 000 Oe（1 Oe = 79.5 A/m）,reaching twelve times that of pure BiFeO3 with an electric field of 15 kV/cm applied,indicating that the enhanced ferroelectricity of the BiFeO3 system with Ho3＋ doping enhances the ferroelectricity of BiFeO3 system;meanwhile,enhanced ferromagnetic properties of Bi1–xHoxFeO3 ceramics were also observed at room temperature when Ho3＋ dosage was increased.The highest residual magnetization and saturation magnetization（0.03 emu/g（1 emu/g = 1 A？m2/kg） and 0.292 emu/g,respectively） were obtained when x = 0.10,at which whole magnetic hysteresis was observed.

关 键 词：多铁材料铁酸铋 铁电性能 电滞回线 铁磁性能 磁滞回线 

分 类 号：O469[理学—凝聚态物理]