Magnetic properties and structural characterization of the solid solution Er2 − xYxBaNiO5 (0 ≤ x ≤ 2)

Journal of The Less Common Metals Pub Date : 1991-09-20 DOI:10.1016/0022-5088(91)90357-A

R. Saez-Puche, J.M. Martin-Llorente, J.M. Coronado

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引用次数: 5

Abstract

Different samples of nominal composition Er_{2 − x}Y_xBaNiO₅ (0 ≤ x ≤ 2) were synthesized and characterized by X-ray powder diffraction. These oxides, which are isostructural, crystallize with orthorhombic symmetry, space group Immm. The linear increase observed in the lattice parameters with increasing values of x is due to the larger ionic radius of the Y³⁺ ion compared with the Er³⁺ ion.

The magnetic susceptibility in all cases obeys Curie-Weiss behavior between 300 K and 40 K. The magnetic moments obtained agree fairly well with those expected for the only contribution of Er³⁺ which confirms the strong antiferromagnetic interactions Ni-O(2)-Ni along the a-axis which we reported earlier for the one-dimensional Y₂BaNiO₅. The three-dimensional antiferromagnetic interactions operative in the undoped Er₂BaNiO₅ are slightly diminished in the substituted Er_{2 − x}Y_xBaNiO₅, as can be deduced from evolution of T_χmax for these samples.

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固溶体Er2−xYxBaNiO5(0≤x≤2)的磁性及结构表征

合成了标称成分为Er2−xYxBaNiO5（0≤x≤2）的不同样品，并用x射线粉末衍射对其进行了表征。这些氧化物是同构的，以正交对称的空间群Immm结晶。观察到的晶格参数随着x值的增加而线性增加是由于与Er3+离子相比Y3+离子的离子半径更大。在300K和40K之间，所有情况下的磁化率都服从居里-维斯行为。所获得的磁矩与Er3+唯一贡献的预期磁矩非常一致，这证实了我们之前报道的一维Y2BaNiO5沿a轴的强反铁磁相互作用Ni-O（2）-Ni。在未掺杂的Er2BaNiO5中起作用的三维反铁磁相互作用在取代的Er2−xYxBaNiO5中略有减弱，这可以从这些样品的Tχmax的演变中推断出来。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of The Less Common Metals

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