作者: C. J. Serna , M. P. Morales
DOI: 10.1007/978-1-4419-9122-5_2
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摘要: It is usually considered that the story of magnetism begins with a mineral called magnetite (Fe3O4), first magnetic material known to man. However, oxidation magnetite, which occurs at very low temperatures ( > 50 °C), results in maghemite (γ-Fe2O3). Both are similar materials structure (spineltype) and properties, makes it difficult differentiate them, but they differ significantly optical electrical characteristics. The main advantage over its chemical stability.