Substituted ferrites studied by nuclear methods
Substituted ferrites studied by nuclear methods
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DOI：
10.1002/1521-396x(200202)189:2
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发表时间：
2002-02
期刊：
影响因子：
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通讯作者：
G. Wiesinger;M. Müller;R. Grossinger;M. Pieper;A. Morel;F. Kools;P. Tenaud;J. L. Breton;J. Kreisel
中科院分区：
文献类型：
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作者：
G. Wiesinger;M. Müller;R. Grossinger;M. Pieper;A. Morel;F. Kools;P. Tenaud;J. L. Breton;J. Kreisel
报道了SrM型六角铁氧体Sr 1-xLaxFe 12-xCoxO 19（0 ≤ x ≤ 0.4）的最新研究结果。已经证明，分别用La和Co同时替代Sr和Fe，显著改善了材料的永磁性能。为了从原子的角度更深入地了解磁序，进行了57 Fe穆斯堡尔谱和NMR（57 Fe，59 Co）研究。它表明，通过应用局部探针超精细技术的知识，这种复杂的材料可以大大提高。主要结果是Co2+优先占据4f 2和2a位，以及Fe 2+离子在取代材料中的存在.
We report on recent investigations on substituted hexaferrites of the type SrM, Sr 1-x La x Fe 12-x Co x O 19 (0 ≤ x ≤ 0.4). It was already proved that the simultaneous substitution of Sr and Fe by La and Co, respectively, significantly improves the permanent magnetic properties of the material. In order to get a deeper insight into the magetic order from an atomistic point of view, 57 Fe Mossbauer spectroscopy and NMR ( 57 Fe, 59 Co) studies were carried out. It is demonstrated that by applying local probe hyperfine techniques the knowledge about this complex material can be considerably improved. The main results concern the preferred Co 2+ occupation on the 4f 2 and the 2a sites and the occurrence of Fe 2+ ions in the substituted material.