Structure and magnetic properties of the perovskite YCo0.5Fe0.5O3

Structure and magnetic properties of the perovskite YCo0.5Fe0.5O3
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钙钛矿YCo0.5Fe0.5O3的结构与磁性能

DOI:
10.1063/1.4904811
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发表时间:
2014-12
期刊:
影响因子:
1.6
通讯作者:
Wenhui Xie
Wenhui Xie
中科院分区:
材料科学4区
文献类型:
--
作者:
Yong Liu;Shengwei Xin;Xiaohong Li;Wenhui Xie

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以柠檬酸盐为前驱体,在950-1100 °C的空气气氛中,采用溶胶-凝胶法成功地制备了具有钙钛矿结构的Y Co_(0.5)Fe_(0.5)O_3。X射线衍射分析表明,样品为正交晶系,空间群为Pnma,Co和Fe离子在4 b晶位上处于无序状态。用Rietveld方法进行的晶体结构精修表明,Co(Fe)O_6八面体的畸变较大,其中Co/Fe-O键长沿着a轴与bc面的键长之比约为1.07。这种大的晶格畸变意味着强的晶格-磁耦合,这可以在磁电器件中利用。磁性测量表明,YCo0.5Fe0.5O3是反铁磁性的,但表现出弱的铁磁性。我们发现Fe ~(3+)离子处于高自旋态,而Co ~(3+)离子处于低自旋态,对磁性没有贡献。Fe ~(3+)和Co ~(3+)离子虽然晶格畸变很大,但都不是Jahn-Teller激活的。
Y Co0.5Fe0.5O3, in a structure of perovskite, has been successfully prepared with citrate precursors at 950-1100 °C in air by the sol-gel method. The X-ray diffraction patterns show that the samples are orthorhombic within the space group Pnma, where the Co and Fe ions are disordered at the 4b crystallographic sites. The crystal structure refinement undertaken by the Rietveld method has shown that the distortion of Co(Fe)O6 octahedra are large, where the ratio of Co/Fe-O bonding length along a axis to that in the bc plane is about 1.07. Such a large crystal lattice distortion implies a strong lattice-magnetism coupling, which may be utilized in the magnetoelectric devices. Magnetic measurement indicates that the Y Co0.5Fe0.5O3 is antiferromagnetic but showing weak ferromagnetism. We find that Fe3+ ions are in high-spin states, while Co3+ ions are in low-spin states which do not contribute to the magnetism. Both Fe3+ and Co3+ ions are not Jahn-Teller activated although the lattice distortion is large.
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