Abstract Honey green synthesis of CoCrxFe2−xO4 (x = 0.0 − 1.0) ferrites with increasing Cr content was done by sol-gel auto-combustion method, without any post-preparation thermal treatment. Nanocrystalline nature (grain diameter range between 12.2 nm and 27.9 nm) of the studied samples is confirmed by X-ray diffraction (XRD) data. Observed modification of magnetic properties can be understood in terms of Cr addition induced changes in degree of inversion, modification of disorder affecting A–A, A–B, B–B interaction, re-distribution of cations on A, B sites in the spinel lattice. Grain size (D)-dependent coercivity (Hc) shows that the studied samples lie in the region with overlap between single- and multi-domain regions. Achieved magnetic properties in the studied honey green synthesized samples have significance for self-regulating hyperthermia applications. Results as well reveal modification of bandgap, and would be of use for applications, where minor bandgap tuning is required. Antistructure modeling provides information on the types of surface-active centers.

中文翻译：

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绿色合成的 Co-Cr 纳米铁氧体的结构、磁性和带隙的 Cr 含量相关改性

摘要 CoCrxFe2−xO4 (x = 0.0 − 1.0) 铁氧体的蜂蜜绿合成随着Cr 含量的增加是通过溶胶-凝胶自燃法完成的，没有任何制备后的热处理。X 射线衍射 (XRD) 数据证实了研究样品的纳米晶体性质（晶粒直径范围在 12.2 nm 和 27.9 nm 之间）。观察到的磁性改变可以理解为 Cr 添加引起的反转程度变化，改变影响 A-A、A-B、B-B 相互作用的无序，尖晶石中 A、B 位点上阳离子的重新分布格子。晶粒尺寸 (D) 相关矫顽力 (Hc) 表明所研究的样品位于单域和多域区域之间重叠的区域。在研究的蜂蜜绿色合成样品中获得的磁性对自调节热疗应用具有重要意义。结果还揭示了带隙的修改，并且可用于需要微调带隙的应用。反结构建模提供有关表面活性中心类型的信息。