The perovskite La 1/3 Sr 2/3 FeO 3−δ was investigated by neutron diffraction, magnetic and Mössbauer spectroscopy measurements. La 1/3 Sr 2/3 FeO 3−δ undergoes magnetic ordering at T = 190–200 K accompanied by charge disproportionation. Magnetic peaks due to charge ordering are observed below 200 K. The charge ordering is gradually developed below 200 K along with a charge disproportionation, 2Fe 4+ ⇒ Fe 3+ + Fe 5+ . La 1/3 Sr 2/3 FeO 3−δ shows an antiferromagnetic structure at low temperature. Magnetic moments of about 3 and 1.3 μ B were obtained from the neutron diffraction data refinement for Fe 3+ and Fe 5+ at 15 K, respectively, which suggest that both Fe ions are in a low spin state. These values are significantly lower than those reported by Battle et al for La 1/3 Sr 2/3 FeO 2.98 . Mössbauer spectra indicate that full charge ordering might be reached below 20 K with no Fe 4+ .
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Yang et al. (2003) studied this question.
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