57Fe Mossbauer study of perovskite-type Fe-Ni nitrides γ′-(Fe1-xNix)4N (0 ≤ x ≤ 0.8)
57Fe Mossbauer study of perovskite-type Fe-Ni nitrides γ′-(Fe1-xNix)4N (0 ≤ x ≤ 0.8)
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DOI：
10.1016/s0304-8853(00)00317-6
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发表时间：
2000-07-01
影响因子：
2.7
通讯作者：
Rechenberg, HR
中科院分区：
文献类型：
--
作者：
Diao, XG;Scorzelli, RB;Rechenberg, HR
采用穆斯堡尔谱学研究了0≤x≤0.8范围内的钙钛矿型铁 - 镍氮化物γ'-(Fe₁₋ₓNiₓ)₄N。在低温（4.2 K或20 K）、约300 K以及每个样品的居里温度以上记录了穆斯堡尔谱。Fe II（立方体面心）位置的四极分裂较大，并且随着镍的取代而增加，超过1 mm/s。低温穆斯堡尔谱通过磁超精细相互作用和四极超精细相互作用以及镍最近邻的二项分布进行拟合。拟合结果表明，随着镍取代量的增加，易磁化轴的方向从[0 0 1]转变为[1 1 1]。Fe I（立方角）位置的超精细场随x异常增加，而在Fe II位置几乎保持不变。在Fe I和Fe II位置，在整个镍浓度范围内，同质异能位移没有任何显著变化。（C）2000 Elsevier Science B.V.保留所有权利。
Perovskite-type Fe-Ni nitrides gamma'-(Fe1-xNix)(4)N in the 0 less than or equal to x less than or equal to 0.8 range have been investigated by Mossbauer spectroscopy. Mossbauer spectra have been recorded at low temperatures (4.2 or 20 K), at similar to 300 K and above the Curie temperature of each sample. The quadrupole splitting at the Fe II (cube face center) site was large and increased upon Ni substitution, exceeding 1 mm/s. The low-temperature Mossbauer spectra were fitted with magnetic and quadrupole hyperfine interactions combined with a binomial distribution of Ni nearest neighbors. The fitting results indicated that the direction of the easy magnetic axis undergoes a transformation from [0 0 1] to [1 1 1] for increasing Ni substitution. The hyperfine field at Fe I (cube corner) site increased anomalously with x, while it remained nearly constant at Fe II site. The isomer shift did not exhibit any significant change in the whole range of Ni concentration at both Fe I and Fe II sites. (C) 2000 Elsevier Science B.V. All rights reserved.