Abstract The creation of oxide based magnetic materials has attracted a great deal of scientific attention, owing to their novel applications in optoelectronic, memory, and spintronic device applications. In this study, the authors report upon the structural, optical, and magnetic properties of Co-substituted CeO2 nanocrystals synthesized via the wet chemical precipitation method. The obtained nanoparticles show good crystallinity as well as an FCC structure with an Fm3m space group of host CeO2 lattice, as confirmed by an X-ray diffraction results. It is noted that Co substitution at low concentrations enhances the photoluminescence characteristics of CeO2 nanoparticles, while higher concentrations significantly reduce the intensity of PL emission, as revealed by PL studies. The estimated M − H loops illustrate that pristine CeO2 shows a paramagnetic nature, while all Co-substituted samples were ferromagnetic in nature. Furthermore, magnetic parameters such as saturation magnetization (MS) and residual magnetization (MR) increased with the inclusion of Co content, reaching a maximum at 4 at% Co and quenching at 6 at% and 8 at% of Co-substitution. In particular, Ce1-xCoxO2 (x = 0.04) nanoparticles show better luminescence and magnetic characteristics than the remaining concentrations.

中文翻译：

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Co取代的CeO2纳米颗粒中增强的光致发光特性和固有铁磁性

摘要 由于氧化物基磁性材料在光电、存储器和自旋电子器件应用中的新应用，它们的创造引起了科学界的广泛关注。在这项研究中，作者报告了通过湿化学沉淀法合成的 Co 取代的 CeO2 纳米晶体的结构、光学和磁性能。X 射线衍射结果证实，获得的纳米颗粒显示出良好的结晶度以及具有 Fm3m 空间群的主 CeO2 晶格的 FCC 结构。PL 研究表明，低浓度的 Co 取代增强了 CeO2 纳米粒子的光致发光特性，而较高的浓度显着降低了 PL 发射的强度。估计的 M - H 环说明原始 CeO2 显示出顺磁性，而所有 Co 取代的样品本质上都是铁磁性的。此外，饱和磁化强度 (MS) 和剩余磁化强度 (MR) 等磁性参数随着 Co 含量的加入而增加，在 4 at% Co 时达到最大值，在 6 at% 和 8 at% Co 取代时淬火。特别是，Ce1-xCoxO2 (x = 0.04) 纳米颗粒显示出比其余浓度更好的发光和磁特性。