Iron-titania-ilmenite triplex composite particles (TCPs) are prepared through a facile calcination induced fractional crystallization route for the first time with natural ilmenite as the starting material. The effects of the calcination condition on the composition, structure and properties of the composites were studied. It is found that the stepwise calcination in oxidizing (first) and reducing (second) environments is the key point to realize the high efficient fractional crystallization and reduction of ilmenite. Contrast experiments with different calcination conditions have also been carried out, and the results reveal that it is possible to tailor the composition and structure of the composite particles by control over the duration of the reduction process. The electromagnetic properties of the TCPs are studied and the results demonstrate that they present ferromagnetic and microwave absorbing properties depended on the processing condition and the composition of the composites, and may have some promising applications in the fields of magnetic materials and microwave absorbers. This work provides a new strategy for the economic and large scale fabrication of multicomponent electromagnetic composites with tailored composition and property from low-cost starting materials, which may be extended to the preparation of other metal-oxide composites or other compounds.

中文翻译：

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来自天然钛铁矿的铁-二氧化钛-钛铁矿三重复合材料：简便的大规模制备和电磁性能

首次以天然钛铁矿为原料，通过简便的煅烧诱导分级结晶路线制备了铁-二氧化钛-钛铁矿三重复合颗粒（TCPs）。研究了煅烧条件对复合材料组成、结构和性能的影响。发现在氧化（第一）和还原（第二）环境中逐步煅烧是实现钛铁矿高效分级结晶和还原的关键。还进行了不同煅烧条件的对比实验，结果表明可以通过控制还原过程的持续时间来调整复合颗粒的组成和结构。研究了TCPs的电磁性能，结果表明它们呈现出铁磁和微波吸收性能，这取决于复合材料的加工条件和组成，在磁性材料和微波吸收剂领域可能有一些有前景的应用。这项工作为从低成本起始材料中经济和大规模制造具有定制成分和性能的多组分电磁复合材料提供了一种新策略，该策略可以扩展到其他金属氧化物复合材料或其他化合物的制备。并且在磁性材料和微波吸收剂领域可能有一些有前景的应用。这项工作为从低成本起始材料中经济和大规模制造具有定制成分和性能的多组分电磁复合材料提供了一种新策略，该策略可以扩展到其他金属氧化物复合材料或其他化合物的制备。并且在磁性材料和微波吸收剂领域可能有一些有前景的应用。这项工作为从低成本起始材料中经济和大规模制造具有定制成分和性能的多组分电磁复合材料提供了一种新策略，该策略可以扩展到其他金属氧化物复合材料或其他化合物的制备。