Effect of pH on the Infrared Radiation Property of CoFe2O4 Powders Synthesized by Sol-Gel Method

doi:10.3724/SP.J.1077.2014.13325

Abstract

Abstract: Cobalt ferrite powders with excellent infrared radiation property were synthesized via the Sol-Gel method, where iron nitrate and cobalt nitrate were used as the original materials and citric acid as the chelating reagent. The effects of pH of the starting solution (pH=1, 3, 5 and 7) on the infrared radiation property of CoFe₂O₄ powders were examined according to the normal direction emissivity. The structure and morphology of the powders were characterized basing on FTIR, TG/DSC, XRD, SEM and BET measurements. It was found that the dried gels obtained from the starting solutions possessed the self-propagating combustion behavior. The pure spinel CoFe₂O₄ powders were obtained by the further treatment of sintered at 600℃ for 2 h. It was foumd that the optimum pH of the starting solution was 5. Under this condition, the highest infrared emissivity (0.92) of the sample was achieved in the 8-14 μm waveband, and the primary mesoporous structure was formed with the largest specific surface area of 65.44 m²/g.

Key words: Sol-Gel, cobalt ferrite, infrared radiation

CLC Number:

TQ174

WU Xiao-Yan, YU Hong-Bing, DONG Heng, YANG Lei, GENG Li-Juan. Effect of pH on the Infrared Radiation Property of CoFe₂O₄ Powders Synthesized by Sol-Gel Method[J]. Journal of Inorganic Materials, 2014, 29(4): 405-410.

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Effect of pH on the Infrared Radiation Property of CoFe₂O₄ Powders Synthesized by Sol-Gel Method

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