Abstract
The La 1 − x Sr x Fe 0.8Cr 0.2O 3 − y ( x = 0.2, 0.4, 0.6 and 0.8) phases were studied by X-ray photoelectron spectroscopy at room temperature and 57Fe Mössbauer spectroscopy at different temperatures. Mixed valence states were observed both for chromium and iron ions, justifying the complex magnetic behaviour exhibited by these compounds. The Mössbauer results indicate the simultaneous presence of Fe 3+, Fe 4+ and Fe 5+ at 4.2 K and the co-existence of Fe 3+ and Fe (3 + n )+ at T = 293 K, with the latter fraction increasing with increasing strontium content. The presence of Cr 3+/4+ is interpreted as being mainly responsible for the incomplete charge disproportionation reaction of iron at low temperature, as deduced from the Mössbauer results.
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