Abstract

It has been shown that microwave radiation induces structural and, as a consequence, magnetic phase transformations in iron oxide α-Fe₂O₃ (hematite). After microwave irradiation of fine-dispersed partially amorphized Fe₂O₃ particles for 10 min in wet air, the percentage of crystalline hematite drops by 40% but the total amount of crystalline components increases owing to the formation of a new ferromagnetic modification, α-Fe₂O₃ maghemite. The initial antiferromagnetic and final ferromagnetic Fe₂O₃ samples are powders consisting of spherical particles with nearly equisized (40–60 nm) domains of X-ray coherent scattering.

中文翻译：

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微波辐射作用下氧化铁的相变

摘要

它已经表明，微波辐射诱导的结构，并且作为结果，在氧化铁的α-Fe磁性相变₂ ö ₃（赤铁矿）。在潮湿的空气中对细分散的部分非晶态的Fe ₂ O ₃颗粒进行微波辐照10分钟后，赤铁矿的结晶百分比下降了40％，但由于形成了新的铁磁变体α-，结晶成分的总量增加了Fe ₂ O ₃磁赤铁矿。最初的反铁磁性和最终的铁磁性Fe ₂ O ₃样品是由球形颗粒组成的粉末，这些球形颗粒的X射线相干散射域几乎相等（40-60 nm）。