Nd掺杂BiFeO_3多铁陶瓷的磁电性能  

Magnetic and electrical properties of Nd-doped BiFeO_3 multiferroic ceramics

作　　者：朱珺钏[1] 王伟[1] 毛翔宇[1] 陈小兵[1] 

机构地区：[1]扬州大学物理科学与技术学院,江苏扬州225002

出　　处：《扬州大学学报（自然科学版）》2008年第2期23-27,共5页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(10274066)

摘　　要：采用快速液相烧结工艺制备出Bi1-xNdxFeO3（BNFO—x，x=0．00～0．20）多铁陶瓷样品，研究了掺杂对BiFeO3微观结构和铁电、磁电及介电性能的影响．X射线衍射谱显示样品BiFeO3的相均已形成，且在掺杂量x=0．10附近出现结构相变．掺杂后样品的剩余磁化（2Mr）和剩余极化（2Pr）都有一定程度的提高，以铁电性能改善最为明显．当掺杂量x=0．10时，样品的耐压性能最好，可观察到完全饱和的电滞回线，且剩余极化达到最大值，2Pr=0．494C·m^-2，比未掺杂时提高了117．6％,随着Nd的掺杂，样品介电常数随温度变化的关系曲线在尼尔温度之前179℃附近多出一个介电峰，但是在BiFeO3样品中并未发现该介电峰．Multiferroic ceramic samples of Bi1-xNdxFeO3 （BNFO-x, x = 0.00 ～ 0.20） have been prepared by the rapid liquid sintering technique. The microstructure is examed by X-ray diffraction, and magnetic, ferroelectric and dielectric properties are also investigated. From the X-ray diffraction patterns of the samples, the typical phase of BiFeO3 （BFO） has formed and a phase transition is observed near x= 0.10. The magnetization property and ferroelectric property of BiFeO3 are improved by Nd doping. The increasing of remanent polarization （2Pr） is obvious. The 2Pr maximizes at x= 0.10 with a value of 0. 494 C · m^-2, which is about 117.6% higher than that of BFO, and a well saturated ferroelectrie hysteresis loop is observed. With the doping of Nd, another dielectric anomaly appears near 179 ℃ before Neel temperature in the ε-t curves, which are not found in the BiFeO3 samples.

关 键 词：多铁陶瓷 掺杂 剩余极化 剩余磁化 介电常数 尼尔温度 

分 类 号：O482.54[一般工业技术—材料科学与工程] TM271[理学—固体物理]