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The oxidation kinetics of CuFeO₂ in Cu-Fe-O system have been studied between temperature range 500° C and 900° C in an ambient atmosphere containing constant oxygen partial pressure in the flowing nitrogen. Thermogravimetric analysis (TGA) technique was used as the main tool. The oxidation rate was found to decrease and the activation energy calculated from the oxidation rate constants for various composition increased from 8 to 45 k cal/mole on increasing the Fe₂O₃ content in the system. The value of exponentn in Avrami’s equation=1 − exp (−ktⁿ) also increased from 1·3 to 2·3. The microstructural changes associated with the oxidation have been studied using optical microscopy and correlated with results obtained from thermogravimetric analysis.

G C Jain¹ B K Das¹ R Avtar¹

1. Division of Materials, National Physical Laboratory, New Delhi - 110 012

Published

October 1979

Manuscript received

23 February 1979