Crystal structure and magnetic ordering of the LaCo1−xFexO3 system
Crystal structure and magnetic ordering of the LaCo1−xFexO3 system
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DOI：
10.1088/0953-8984/17/46/006
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
D. V. Karpinsky;I. Troyanchuk;K. Bärner;H. Szymczak;Michael Tovar
中科院分区：
文献类型：
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作者：
D. V. Karpinsky;I. Troyanchuk;K. Bärner;H. Szymczak;Michael Tovar
用中子粉末衍射、X-射线粉末衍射和磁化强度测量等方法研究了LaCo_1-−_xFe_xO_3化合物。NPD和XPD图谱被成功地细化为菱形(x≤0.5)和正交形(x≥0.6)。从斜方相到正交相的温度诱导转变以两相晶体结构状态为特征。磁化强度和中子粉测量表明，x<；0.4的化合物表现出类似顺磁的行为，而x-≥；0.4的样品则观察到弱的铁磁性成分。通过允许反铁磁矢量的Gz空间取向，成功地精炼了NPD图案。LaCo_1-−_xFe_xO_3样品的磁性可以在Co3+离子处于低自旋态的假设下得到解释，反铁磁性是由Fe~(3+)离子之间的磁性相互作用引起的。根据所获得的数据，绘制了晶体和磁性的组合相图。
The LaCo1−xFexO3 compounds have been investigated by means of neutron powder diffraction (NPD), x-ray powder diffraction (XPD) and magnetization measurements. The NPD and XPD patterns were successfully refined as rhombohedral (x≤0.5) and orthorhombic (x≥0.6). The temperature-induced transition from the rhombohedral phase into the orthorhombic one is characterized by a two-phase crystal structure state. Magnetization and neutron powder measurements have revealed that compounds with x<0.4 exhibit a paramagnetic-like behaviour, whereas for x≥0.4 samples a weak ferromagnetic component was observed. The NPD patterns were successfully refined by admitting a Gz spatial orientation of the antiferromagnetic vector. The magnetic properties of the LaCo1−xFexO3 samples can be explained assuming a low spin state of the Co3+ ions, whereas antiferromagnetism is caused by magnetic interactions between the Fe3+ ions. Based on the obtained data the combined crystal and magnetic phase diagram has been constructed.