Fe_mO_n–TiO₂ particle aggregates have been obtained using the sol–gel method and hydrothermal treatment. It is shown that the synthesis conditions favor forming composites that contain titanomagnetite in very low concentrations. Hysteresis loops and demagnetization curves of anhysteretic remanent magnetization were measured with a vibration sample and a SQUID magnetometer, respectively. Mössbauer spectroscopy, bulk magnetic properties, scanning electron microscopy (SEM) observations, coupled with the theoretical analysis of magnetostatic interaction between finely dispersed particles lead to a conclusion that the studied composites can be viewed as groups of interacting clusters 2– $20~\mu \text{m}$ in size, consisting of chemically heterogeneous, mostly single-domain or close to single-domain particles with an average size of about 100 nm.

中文翻译：

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合成 FemOn-TiO2 复合材料的磁性粒度测定和穆斯堡尔光谱

Fe _m O _n -TiO ₂颗粒聚集体已经使用溶胶-凝胶法和水热处理获得。结果表明，合成条件有利于形成含有极低浓度钛磁铁矿的复合材料。分别用振动样品和SQUID磁力计测量了无磁滞剩磁的磁滞回线和退磁曲线。穆斯堡尔光谱、体磁特性、扫描电子显微镜 (SEM) 观察，再加上细分散颗粒之间静磁相互作用的理论分析得出的结论是，所研究的复合材料可以被视为相互作用的簇群 2– $20~\mu \text{m}$ 在尺寸上，由化学异质的，主要是单域或接近单域的颗粒组成，平均尺寸约为 100 nm。