Effect of Fe substitution on multiferroic hexagonal YMnO3
Effect of Fe substitution on multiferroic hexagonal YMnO3
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DOI：
10.1016/j.jmmm.2010.09.055
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发表时间：
2011-03
影响因子：
2.7
通讯作者：
M. Zaghrioui;J. Greneche;C. Autret-Lambert;M. Gervais
中科院分区：
文献类型：
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作者：
M. Zaghrioui;J. Greneche;C. Autret-Lambert;M. Gervais
采用柠檬酸盐改性法制备了多晶YMn1−xFexO3（x=0.02 ~ 0.20）粉体。粉末x射线衍射结果表明，所有样品均为单相，呈现六方结构，与YMnO3的P63cm空间基团一致。铁的溶解度极限约为6wt.%。由于Fe3+和Mn3+具有相同的离子半径，电池参数值随Fe含量的增加而增加。这可以归因于mno5双棱柱的倾斜增加和Y原子的屈曲。此外，57Fe Mössbauer光谱法提供了两个Fe3+位点归属于两个最近的原子邻居的证据。磁性能显示顺磁性到反铁磁性的转变，磁性各向异性可能增加，以及铁磁性和反铁磁性相互作用之间的竞争。
Polycrystalline YMn1−xFexO3(x=0.02–0.20) powders were synthesized by means of modified citrate method. Powder X-ray diffraction gives evidence that all the samples are single phase and exhibit hexagonal structure with P63cm space group as observed for YMnO3. The solubility limit of Fe was determined as about 6wt.%. Cell parameter values were found to increase with Fe content, since Fe3+and Mn3+have the same ionic radii. This can be attributed to the increase of the tilting of MnO5bipyramid and the buckling of Y atoms. In addition,57Fe Mössbauer spectrometry provides evidence of two Fe3+sites attributed to two different nearest atomic neighbours. Magnetic properties reveal a paramagnetic-to-antiferromagnetic transition, a possible increase of the magnetic anisotropy, and a competition between ferromagnetic and antiferromagnetic interactions.