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首页> 外文期刊>Journal of Applied Physics >Crystallographic and Magnetic Studies of the System (NiFe2O4)1-x + (NiMn2O4)x
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Crystallographic and Magnetic Studies of the System (NiFe2O4)1-x + (NiMn2O4)x

机译：（NiFe2O4）1-x +（NiMn2O4）x的晶体学和磁学研究

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摘要

The system (NiFe2O4)1-x + (NiMn2O4)x was selected to study the role of the Mn3+ ion in determining the crystallographic and magnetic properties of spinels. The ionic distribution was investigated by means of x-ray diffraction. A cubic spinel structure is obtained throughout the system, the lattice parameter increasing monotonically with x from 8.34 to 8.39 A. It is found that in the range 0≤x≤0.5 that manganese progressively replaces iron on the six-coordinated sites whereas, in the range 0.5≤x≤1, the manganese progressively replaces iron on the four-coordinated sites. Therefore, manganese is not able to displace nickel from the six-coordinated sites and NiMn2O4 is a cubic inverse spinel. These results are consistent with the thesis that the tetragonal distortions of ZnMn2O4, Mn3O4, MgMn2O4, and Li0.5Mn2.5O4 are because of the six-coordinated sites in these compounds essentially all being occupied by manganese ions. Magnetostriction measurements were made as a function of applied field to determine the sign and order of magnitude of the magnetic anisotropy of the polycrystalline samples. The magnetic anisotropy is found to pass through zero with increasing x, becoming highly positive (K≃+105 ergs/cc) at x=0.5. Heretofore only the Co2+ ion has been found to produce a positive anisotropy in the spinel structure. Magnetic moment measurements indicate that all of the manganese is trivalent in the range 0≤x≤0.5. However, magnetic moment measurements over the range 0.5≤x≤1 indicate that at x=1, NiMn2O4, the manganese is divalent and quadravalent on the four- and six-coordinated sites respec tively. NiMn2O4 appears to become ferrimagnetic at approximately 100°K.
机译：选择（NiFe2O4）1-x +（NiMn2O4）x系统来研究Mn3 +离子在确定尖晶石的晶体学和磁性方面的作用。通过X射线衍射研究离子分布。在整个系统中均获得立方尖晶石结构，晶格参数随x从8.34至8.39 A单调增加。发现在0≤x≤0.5的范围内，锰会逐渐取代六个配位点上的铁，而在在0.5≤x≤1的范围内，锰在四个配位位置逐渐替代铁。因此，锰不能从六个配位位置上取代镍，而NiMn2O4是立方反尖晶石。这些结果与以下事实相符：ZnMn2O4，Mn3O4，MgMn2O4和Li0.5Mn2.5O4的四方畸变是因为这些化合物中的六个配位位点基本上全部被锰离子占据。根据施加的磁场进行磁致伸缩测量，以确定多晶样品的磁各向异性的符号和量级。发现随着x的增加，磁各向异性穿过零，在x ＝ 0.5时变得高度正（K +105 ergs / cc）。迄今为止，仅发现Co 2+离子在尖晶石结构中产生正各向异性。磁矩测量表明，所有锰均为三价，范围为0≤x≤0.5。但是，在0.5≤x≤1范围内的磁矩测量结果表明，在x = 1时，NiMn2O4的锰分别在四配位和六配位的位置上为二价和四价。 NiMn2O4似乎在大约100°K时变为亚铁磁性。

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  • 来源
    《Journal of Applied Physics》 |1958年第3期|共3页
  • 作者

    Baltzer Philip K.; White John G.;

  • 作者单位

    RCA Laboratories, Radio Corporation of America, Princeton, New Jersey;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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