⁵⁷Fe Mössbauer spectroscopy study of LaFe_1-xCo_xO₃ ( x=0 and 0.5) formed by mechanical milling

Berry, Frank J.; Ren, Xiaolin; Gancedo, J. Ramón and Marco, José F. (2004). ⁵⁷Fe Mössbauer spectroscopy study of LaFe_1-xCo_xO₃ ( x=0 and 0.5) formed by mechanical milling. Hyperfine Interactions, 156-157(1-4) pp. 335–340.

DOI: https://doi.org/10.1023/B:HYPE.0000043250.73180.00

Abstract

Perovskite-related phases of the type LaFe1-xCoxO3 (x = 0 and 0.5) have been synthesised by milling techniques. The materials are of smaller particle size and more susceptible to reduction in a flowing hydrogen/nitrogen gas mixture than their counterparts made by conventional solid state calcination methods. The presence of cobalt enhances the reducibility of iron in the perovskite-related structure and, in contrast to LaFeO3 where the oxide structure is at least partially retained even after treatment in the reducing atmosphere at 1150degreesC, treatment of LaFe0.5Co0.5O3 in a reducing atmosphere leads to reduction of both Fe3+ and Co3+, their segregation from the oxide matrix, and the formation of an iron-cobalt alloy.

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