Mössbauer矫顽力与颗粒固体中颗粒形态的研究和相关性

Scripta Metallurgica et Materialia Pub Date : 1995-12-01 DOI:10.1016/0956-716X(95)00455-5

G.C. Hadjipanayis , A. Tsoukatos , V. Papaefthymiou , A. Simopoulos , A. Kostikas

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引用次数: 1

摘要

FeSiO2和FeBN颗粒膜的矫顽力值存在较大差异，BN基体中的矫顽力要低得多。我们已经使用Mössbauer光谱学来尝试理解磁滞行为的差异。Mössbauer数据表明，FeSiO2薄膜的核/壳形态为Fe(Fe- si)核被Fe-Si-O壳包围，其表面由Fe2+-Si-O晶粒组成。在FeBN中，数据表明BN基体中存在无定形的Fe-B颗粒。这种假设的颗粒形态可以解释由于非晶相的低各向异性而导致SiO2膜的高矫顽力值和BN膜的低Hc值。

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Mössbauer studies and correlation of coercivity with particle morphology in FeSiO2 and FeBN granular solids

Large differences have been observed in the coercivity values of $Fe SiO_{2}$ and $Fe BN$ granular films with the coercivities being much lower in the BN matrix. We have used Mössbauer spectroscopy in an attempt to understand the differences in the magnetic hysteresis behavior. The Mössbauer data suggest a core/shell morphology for the $Fe SiO_{2}$ films with an Fe(Fe-Si) core surrounded by an Fe-Si-O shell whose surface consists of Fe²⁺-Si-O grains. In $Fe BN$ the data indicate the presence of amorphous Fe-B particles in a BN matrix. This hypothesized particle morphology can explain the high coercivity values in SiO₂ films and the low H_c in BN because of the low anisotropy of the amorphous phase.

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Scripta Metallurgica et Materialia

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