同时,我们测试了Bi1-xGdxFeO3陶瓷样品在1kOe下的场冷M-T曲线(图3),由图知随着温度的降低,其磁性能逐渐增强,低温下掺杂样品在100K至5K之间其磁性迅速增强,这可能源自于低温下Gd3+的磁矩逐渐增强。而对于BiFeO3陶瓷在1kOe下的场冷,在300K至130K之间磁化强度缓慢增加,这与其本身固有的反铁磁性随温度的变化有关,但在130K至5K之间出现了明显的反铁磁向弱铁磁转变。由于弱铁磁相的出现,磁化强度迅速增加,这个转变过程主要是由低温下Fe3+的团簇或自旋重取向引起的。
4 结 论
使用固相烧结法制备了Bi1-xGdxFeO3(x=0, 0.05, 0.1, 0.15, 0.2)陶瓷样品;通过XRD图谱发现,掺杂体系在x=0.15附近经历了由三角钙钛矿结构向正交钙钛矿结构的转变;此结构转变在Raman图谱中亦有所反映;通过磁性能测试,发现掺杂大大提高了Bi1-xGdxFeO3陶瓷的铁磁性,这是由于Gd的掺杂在一定程度上破坏了BiFeO3陶瓷特有的自旋螺旋反铁磁结构所致。
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Structural and magneticproperties in multiferroic ceramics Bi1-xGdxFeO3 (x=0, 0.05, 0.1, 0.15, 0.2)
Zhou Tong, Shujuan Yuan,Yiming Cao, Hui Xie, Fenfen Chang, Shixun Cao
Physics Department of Shanghai University, Shanghai 200444
Single-phaseBi1-xGdxFeO3 multiferroic ceramics have beensynthesized by the solid state reaction method to study the influence of Gd substitutionon their crystal structure and magnetic behavior. X-ray diffraction and Raman scattering spectra analysis showed that the structure of Gd dopedBiFeO3 was transformed from rhombohedral lattice to orthorhombic by increasingx. Doping with Gd also enhances the ferromagneticmoment, due to the broken cycloid spin structure caused by the distortion in thecrystalline structure.
Key words: BiFeO3,Multiferroics,Doping
PACC: 7590,7870C,8120L
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