Journal
HYPERFINE INTERACTIONS
Volume 156, Issue 1, Pages 335-340Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/B:HYPE.0000043250.73180.00
Keywords
Fe-57 Mossbuer spectroscopy; orthoferrites; mechanical milling
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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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