Abstract A new family of nanoferrites composed of Ni1-xHoxFe2O4 (0 ≤ x ≤ 0.07) was developed via a 1,4-dithioerythritol assisted polyol technique. The influence of holmium (Ho) cations on the lattice constant, nanoparticle size, and stoichiometry of the cubic spinel structures were examined using X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and scanning electron microscopy (SEM). Doping with Ho cations (up to 3 wt%) in Ni1-xHoxFe2O4 causes an increase of the nanocrystal diameter and the lattice constant. The FTIR and Raman measurements showed the migration of iron cations from tetrahedral to octahedral sublattices due to incorporation of Ho cations. Magnetic (M-H) measurements demonstrated that Ni0.97Ho0.03Fe2O4 exhibits a remarkable improvement of the coercive field (129.7 Gauss) and the saturation magnetization (36.6 emu/g) compared with NiFe2O4, for which the coercive field is 23.3 Gauss and the saturation magnetization is 7.5 emu/g. The enhancement of magnetic constants by more than five orders of magnitude for Ni1-xHoxFe2O4 nano-ceramics make them promising as magnetic catalytic materials and magnetic nanocarriers for drug delivery applications.

中文翻译：

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通过 1,4-二硫赤藓糖醇辅助多元醇技术开发基于 Ni1-xHoxFe2O4 (0≤x≤0.07) 的新系列尖晶石纳米陶瓷铁氧体

摘要 通过 1,4-二硫赤藓糖醇辅助多元醇技术开发了由 Ni1-xHoxFe2O4 (0 ≤ x ≤ 0.07) 组成的新型纳米铁氧体家族。使用 X 射线衍射 (XRD)、能量色散谱 (EDS) 和扫描电子显微镜 (SEM) 检查钬 (Ho) 阳离子对立方尖晶石结构的晶格常数、纳米颗粒尺寸和化学计量的影响。在 Ni1-xHoxFe2O4 中掺杂 Ho 阳离子（高达 3 wt%）会导致纳米晶体直径和晶格常数增加。FTIR 和拉曼测量表明，由于 Ho 阳离子的掺入，铁阳离子从四面体亚晶格迁移到八面体亚晶格。磁 (MH) 测量表明 Ni0.97Ho0.03Fe2O4 表现出矫顽场 (129.7 高斯) 和饱和磁化强度 (36. 6 emu/g) 与矫顽磁场为 23.3 高斯、饱和磁化强度为 7.5 emu/g 的 NiFe2O4 相比。Ni1-xHoxFe2O4 纳米陶瓷的磁常数提高了五个数量级以上，这使它们有望作为磁性催化材料和磁性纳米载体用于药物递送应用。