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Magnetic and dipole moments in indium doped barium hexaferrites
Journal of Magnetism and Magnetic Materials ( IF 2.7 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.jmmm.2018.02.078
S.V. Trukhanov , A.V. Trukhanov , V.A. Turchenko , An.V. Trukhanov , D.I. Tishkevich , E.L. Trukhanova , T.I. Zubar , D.V. Karpinsky , V.G. Kostishyn , L.V. Panina , D.A. Vinnik , S.A. Gudkova , E.A. Trofimov , P. Thakur , A. Thakur , Y. Yang

Abstract Crystal and magnetic structure of the doped BaFe12−xInxO19 samples were refined by the results of investigations using high resolution neutron powder diffraction and vibration sample magnetometry at different temperatures. The refinements were realized in frame of two space groups. The P63/mmc (No 194) centrosymmetric nonpolar and P63mc (No 186) noncentrosymmetric polar space groups were used. The unit cell parameters, ionic coordinates, thermal isotropic factors, occupation positions, bond lengths and bond angles, microstrain values were established. The magnetic and dipole moments were also defined. It is established that the In3+ cations may be located only in the Fe1 – 2a and Fe2 – 2b crystallographic positions with equal probability for the sample with lowest substitution level x = 0.1. At the x = 1.2 substitution level about half of the In3+ cations occupies the Fe5 – 12 k positions. For the last sample the remaining half of the In3+ cations is equiprobably located in the Fe1 – 2a and Fe2 – 2b positions. The spontaneous polarization was established for these compositions at 300 K. It is studied the influence of the type of substitutive cation and structural parameters on the Fe3+(i) – O2− – Fe3+(j) (i, j = 1, 2, 3, 4, 5) indirect superexchange interactions with temperature. With substitution level increase the superexchange interactions between the magnetic positions inside and outside the sublattices are broken which leads to a decrease in the value of their magnetic moments.

中文翻译:

铟掺杂六铁氧体钡的磁矩和偶极矩

摘要 利用高分辨率中子粉末衍射和不同温度下的振动样品磁强法研究结果,对掺杂的 BaFe12−xInxO19 样品的晶体和磁结构进行了细化。改进是在两个空间群的框架中实现的。使用了 P63/mmc (No 194) 中心对称非极性空间群和 P63mc (No 186) 非中心对称极性空间群。建立了晶胞参数、离子坐标、热各向同性因子、占据位置、键长和键角、微应变值。还定义了磁矩和偶极矩。已确定 In3+ 阳离子可能仅位于 Fe1 – 2a 和 Fe2 – 2b 晶体学位置,对于具有最低取代水平 x = 0.1 的样品,其概率相等。在 x = 1 处。2 取代水平大约一半的 In3+ 阳离子占据 Fe5 – 12 k 位置。对于最后一个样品,剩余的一半 In3+ 阳离子很可能位于 Fe1 – 2a 和 Fe2 – 2b 位置。这些成分在 300 K 时建立了自发极化。 研究了取代阳离子类型和结构参数对 Fe3+(i) – O2− – Fe3+(j) (i, j = 1, 2, 3 , 4, 5) 与温度的间接超交换相互作用。随着取代水平的增加,亚晶格内外磁位置之间的超交换相互作用被破坏,导致它们的磁矩值减小。对于最后一个样品,剩余的一半 In3+ 阳离子很可能位于 Fe1 – 2a 和 Fe2 – 2b 位置。这些成分在 300 K 时建立了自发极化。 研究了取代阳离子类型和结构参数对 Fe3+(i) – O2− – Fe3+(j) (i, j = 1, 2, 3 , 4, 5) 与温度的间接超交换相互作用。随着取代水平的增加,亚晶格内外磁位置之间的超交换相互作用被破坏,导致它们的磁矩值减小。对于最后一个样品,剩余的一半 In3+ 阳离子很可能位于 Fe1 – 2a 和 Fe2 – 2b 位置。这些成分在 300 K 时建立了自发极化。研究了取代阳离子类型和结构参数对 Fe3+(i) – O2− – Fe3+(j) (i, j = 1, 2, 3 , 4, 5) 与温度的间接超交换相互作用。随着取代水平的增加,亚晶格内外磁位置之间的超交换相互作用被破坏,导致它们的磁矩值减小。5) 与温度的间接超交换相互作用。随着取代水平的增加,亚晶格内外磁位置之间的超交换相互作用被破坏,导致它们的磁矩值减小。5) 与温度的间接超交换相互作用。随着取代水平的增加,亚晶格内外磁位置之间的超交换相互作用被破坏,导致它们的磁矩值减小。
更新日期:2018-07-01
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