论文标题
在α-FE2O3和Alpha-Cr2O3氧化物的机械合金材料中调整结构相，磁性自旋顺序和电导率
Tuning of structural phase, magnetic spin order and electrical conductivity in mechanical alloyed material of alpha-Fe2O3 and alpha-Cr2O3 oxides
论文作者
论文摘要
Alpha-FE2O3和Alpha-Cr2O3已被机械合金，以制备Fe1-XCRXO3氧化物的X = 0.2-0.8。同步子X射线衍射和拉曼光谱显示出在合成的样品中显示了α-FE2O3和α-CR2O3相的不均匀结构。合成的样品显示出具有两个莫林过渡的特征的软铁磁特性。合金样品的热处理具有匀浆结构，并成功地将Cr原子掺入了α-FE2O3中的Fe原子的晶格位点。磁性和电性能已在热处理的样品中进行了修改。例如，与Fe1-XCRXO3中的CR含量无关，倾斜的抗磁磁序似乎是热处理的作用。磁场诱导的自旋触摸转变已在临界磁场上观察到，该磁场取决于系统中的CR含量。室温下的莫斯鲍尔光谱已安装两个六分光。 Mössbauer参数的变化表明，Fe1-XCRXO3的菱形结构中Fe和Cr离子之间的磁性自旋顺序分布。通过增加α-FE2O3结构中的CR含量来增强了来自热处理样品的电流 - 电压特性的电导率。基于文献中可用的理论模型对实验结果进行了解释。
Alpha-Fe2O3 and alpha-Cr2O3 has been mechanical alloyed to prepare Fe1-xCrxO3 oxides for x = 0.2-0.8. Synchrotron X-ray diffraction and Raman spectra have shown inhomogeneous structure of α-Fe2O3 and α-Cr2O3 phases in as-alloyed samples. The as-alloyed samples have shown soft ferromagnetic properties with signature of two Morin transitions. The heat treatment of as-alloyed samples has homogenized structure and successfully incorporated the Cr atoms into the lattice sites of Fe atoms in α-Fe2O3. The magnetic and electrical properties have been modified in the heat treated samples. For example, canted antiferromagnetic order has been appeared as an effect of heat treatment, irrespective of the Cr content in Fe1-xCrxO3. The magnetic field induced spin flop transition has been observed at a critical magnetic field that depends on Cr content in the system. The Mössbauer spectrum at room temperature has been fitted with two sextets. The variation of Mössbauer parameters suggest a distribution of magnetic spin order between Fe and Cr ions in the rhombohedral structure of Fe1-xCrxO3. The electrical conductivity, derived from current-voltage characteristics of the heat treated samples, has been enhanced by increasing Cr content in alpha-Fe2O3 structure. The experimental results have been explained based on the theoretical models available in literature.
