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首页> 外文期刊>Physica, B. Condensed Matter >Structural and magnetic properties of Cu-Ni-Cr spinel oxides
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Structural and magnetic properties of Cu-Ni-Cr spinel oxides

机译：Cu-Ni-Cr尖晶石氧化物的结构和磁性

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yThe compounds CuCr2O4 and NiCr2O4 crystallize at room temperature in a tetragonal distorted spinel structure, s.g. I4(1)/amd, with axes ratio c/a < 1 and > 1, respectively. The distortion is caused by the Jahn-Teller ions Cu2+ and Ni2+ which flatten or elongate their surrounding oxygen tetrahedron. CuCr2O4 and NiCr2O4 form a complete solid solution series Cu1-xNixCr2O4 where for 0.825 < x < 0.875 members with orthorhombic symmetry were found. Using neutron powder diffraction and thermal analysis methods several members of the solid solution series were investigated. On cooling, all samples showed a temperature-dependent crystallographic phase transition from cubic to tetragonal symmetry between 865K (CuCr2O4) and 310K (NiCr2O4). The phase Cu0.15Ni0.85Cr2O4 undergoes a second crystallographic transition to orthorhombic symmetry, space group Fddd, at T = 300 K. The neutron diffraction experiments as well as SQUID measurements reveal magnetic ordering of the ions between 150 and 50 K which partially occurs as a two-step mechanism. (c) 2006 Elsevier B.V. All rights reserved.
机译：化合物CuCr2O4和NiCr2O4在室温下以四方扭曲的尖晶石结构结晶，例如I4（1）/ amd，轴比c / a <1和> 1。变形是由Jahn-Teller离子Cu2 +和Ni2 +使它们周围的氧四面体变平或拉长引起的。 CuCr2O4和NiCr2O4形成一个完整的固溶体系列Cu1-xNixCr2O4，其中发现0.825

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