Abstract The present short communication reports an original experimental calcination method to synthesize magnetic materials with high thermal stability such as magnetite (Fe3O4) with typical spinel and atypical crystal shape, sub-micrometric rounded crystals of ceria (CeO2) and magnetite-ceria composites with varied shape and size of crystals. Shape and size depending on the nature of mineral precursors (goethite, siderite or ferrihydrite). Herein, it was demonstrated that cooperative redox reactions and simple vacuum can be used to synthesize magnetic composite materials by calcination of nanostructured mineral precursors. In this way, bastnasite mineral (CeCO3F) is a powerful reducing agent to synthesize magnetite from reductive dehydration of ferric oxyhydroxides.

中文翻译：

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纳米结构前体矿物煅烧合成磁铁矿、二氧化铈和磁铁矿-二氧化铈材料

摘要 本短讯报道了一种独创的实验煅烧方法来合成具有高热稳定性的磁性材料，例如具有典型尖晶石和非典型晶体形状的磁铁矿 (Fe3O4)、亚微米圆形氧化铈 (CeO2) 和具有不同特性的磁铁矿-氧化铈复合材料。晶体的形状和大小。形状和大小取决于矿物前体（针铁矿、菱铁矿或水铁矿）的性质。在此，证明了协同氧化还原反应和简单真空可用于通过煅烧纳米结构矿物前体来合成磁性复合材料。通过这种方式，氟碳铈矿矿物 (CeCO3F) 是一种强大的还原剂，可通过羟基氧化铁的还原脱水来合成磁铁矿。