Experimental

CuFe204 was synthesized by a coprecipitation method. Requisite quantities of FeCl3 and CuCb were dissolved in distilled water. The precipitate was stirred at 80 °C for 6 h. The product was filtered and washed with distilled water several time and dried at 100 °C for 12 h.

The dried Cu ferrite powder was calcined at 900 °C for 2 h. In order to observe the redox behavior of CuFe204, Cu ferrite was reduced in CH4 gas and oxidized in C02 gas with a microbalance (TGA, Cahn Instruments Inc., Cahn 2000). The structural change by the redox treatment was analyzed by XRD and Mossbauer spectrometer. XRD was carried out with CuKal radiation (using a McScience, model M18SHF-SRA) to monitor structural changes of Cu ferrite. Mossbauer spectrum was recorded using a conventional Mossbauer spectrometer of the electromechanical type with a 30 mCi source in a Rh matrix at 4.2 K.

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