1) Inorganic Materials Department, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
2) Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

Ferrite compound Co_0:6Zn_0:4NixFe_2-xO₄ was synthesized by solid state reaction. The structure and performance of Co_0:6Zn_0:4Ni_xFe_2-xO₄ compounds were studied by MÄossbauer spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and infrared radiant tester. MÄossbauer spectroscopy and XPS analysis show the valence states and distribution of cations in Co_0:6Zn_0:4Ni_xFe_2-xO₄. Zn²⁺ has invariably shown preference for the tetrahedral sites, and Ni²⁺ has the preference for the octahedral sites. The occupancy of Fe³⁺ linearly increases on the tetrahedral sites, and sharply decreases on the octahedral sites with increasing x, owing to its gradual replacement by Ni²⁺ on the octahedral sites. It indicates that due to the occupation of octahedral sites by the majority of Ni²⁺, Fe³⁺ decreasingly migrated from the octahedral sites to the tetrahedral sites and substituted Co³⁺ sites, which made the number of Co³⁺ in the tetrahedral sites decreasing. According to the measurement results of XRD and the infrared radiant tester analysis, the lattice parameter and infrared radiance have shown a nonlinear variation, exhibiting the infrared average radiance of 0.92 in the 8-14 μm waveband, and the results demonstrate that these Co-Zn-Ni spinel ferrites have potential for application in a wide range of infrared heating and drying materials.

the Key Project in Science and Technology Innovation Cultivation Program of Soochow University, China (Contract No. Q3109808)