Title

Charge Disproportionation and Ordering in La₁/₃Sr₂/₃FeO₃₋δ

Abstract

The perovskite La1/3Sr2/3FeO3-δ was investigated by neutron diffraction, magnetic and Mössbauer spectroscopy measurements. La1/3Sr2/3FeO3-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, 2Fe4+ ⇒ Fe3+ + Fe5+. La1/3Sr2/3FeO3-δ shows an antiferromagnetic structure at low temperature. Magnetic moments of about 3 and 1.3 μB were obtained from the neutron diffraction data refinement for Fe3+ and Fe5+ 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 La1/3Sr2/3FeO 2.98. Mössbauer spectra indicate that full charge ordering might be reached below 20 K with no Fe4+.

Department(s)

Materials Science and Engineering

Second Department

Physics

Third Department

Chemistry

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2003 Institute of Physics - IOP Publishing, All rights reserved.

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