Abstract A series of spinel-type MnxNi1-xCo2O4 (x = 0, 0.3, 0.5, 0.7, 1) oxides were synthesized by using a citrate sol-gel technique. The structural, magnetic and electronic properties of the oxides with different Mn content were investigated using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), vibrating sample magnetometer (VSM) and X-ray photoelectron spectroscopy (XPS). The XRD and FTIR studies revealed that MnxNi1-xCo2O4 formed in a cubic structure for all the compositions synthesized. Transmission electron microscopy (TEM) studies show cubic nano-plates for x = 0 and on increasing Mn concentration, agglomerated nanoparticles with sphere-like shape are observed with a particle size in the range of 11.7 nm–22.1 nm. This is in close agreement with the results of XRD analysis. The Mn 2p, Ni 2p, and Co 2p XPS spectra reveal the coexistence of Mn2+, Mn3+, Ni2+, Ni3+, Co2+, and Co3+ species on the surface of MnxNi1-xCo2O4 samples in differing proportions. The measurements of magnetic properties at room temperature show that the samples have some ferromagnetic behaviour. The saturation magnetization, remnant magnetization, and coercivity of the nanoparticles vary significantly with a concentration of Mn, which tends to be distributed in both tetrahedral and octahedral positions of the spinel lattice.

中文翻译：

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Mn x Ni 1-x Co 2 O 4 尖晶石相材料的溶胶-凝胶合成：结构、电子和磁性能

摘要 采用柠檬酸盐溶胶-凝胶技术合成了一系列尖晶石型MnxNi1-xCo2O4 (x = 0, 0.3, 0.5, 0.7, 1)氧化物。使用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、振动样品磁强计（VSM）和X射线光电子能谱（XPS）研究了具有不同Mn含量的氧化物的结构、磁性和电子性质。XRD 和 FTIR 研究表明，对于所有合成的组合物，MnxNi1-xCo2O4 均以立方结构形成。透射电子显微镜 (TEM) 研究显示 x = 0 的立方纳米片，并且随着 Mn 浓度的增加，观察到具有球形形状的团聚纳米颗粒，其粒径范围为 11.7 nm–22.1 nm。这与XRD分析的结果非常一致。Mn 2p, Ni 2p, 和 Co 2p XPS 光谱揭示了 MnxNi1-xCo2O4 样品表面上 Mn2+、Mn3+、Ni2+、Ni3+、Co2+ 和 Co3+ 物种以不同比例共存。室温下磁性能的测量表明样品具有一定的铁磁行为。纳米颗粒的饱和磁化强度、剩余磁化强度和矫顽力随Mn浓度变化显着变化，Mn倾向于分布在尖晶石晶格的四面体和八面体位置。