Structure, Infrared Radiation Properties and MûÖssbauer Spectroscopic Investigations of Co_0.6Zn_0.4Ni_xFe_2-xO₄ Ceramics

Ying Zhang1), Jun Lin2) and Dijiang Wen1) 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

Õª Òª£ºFerrite compound Co0.6Zn0.4NixFe2-xO4 was synthesized by solid state reaction. The structure and performance of Co0.6Zn0.4NixFe2-xO4 compounds were studied by MûÖssbauer spectroscopy, X-ray diffraction £¨XRD£©, X-ray photoelectron spectroscopy £¨XPS£© and infrared radiant tester. MûÖssbauer spectroscopy and XPS analysis show the valence states and distribution of cations in Co0.6Zn0.4NixFe2-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 ¦Ìm 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.

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