Layered (Cu,Fe) oxides of double perovskite structure: Correlation between structural and magnetic-property changes in BaY(Cu0.5Fe0.5)2O5+[delta] upon high-pressure heat treatment

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Journal Title
Journal ISSN
Volume Title
School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
1998
Major/Subject
Mcode
Degree programme
Language
en
Pages
3371-3376
Series
Physical Review B, Volume 58, Issue 6
Abstract
In this paper, we report the correlation between the magnetic property and the local structure in BaY(Cu0.5Fe0.5)2O5+δ of the “0112” phase containing an unusually large amount of excess oxygen, δ of ∼0.2, when heat treated under a high pressure of 5 GPa. Magnetic susceptibility measurements showed that upon the high-pressure heat treatment, the lower-temperature magnetic transition which had been observed in normal-pressure synthesized, antiferromagnetic BaY(Cu0.5Fe0.5)2O5 disappeared and the higher-temperature transition, i.e., the Néel temperature, was lowered. According to a Rietveld analysis based on x-ray-diffraction data and space group P4/mmm, the distinction between Cu and Fe positions along the c axis inside the oxygen pyramid disappeared. Coulometric titrations and Mössbauer spectroscopy measurements strongly suggested the existence of excess oxygen in the yttrium plane.
Description
Keywords
perovskite structures, copper oxide, iron oxide, magnetic properties
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Citation
Nagase, M. & Lindén, J. & Miettinen, J. & Karppinen, Maarit & Yamauchi, H. 1998. Layered (Cu,Fe) oxides of double perovskite structure: Correlation between structural and magnetic-property changes in BaY(Cu0.5Fe0.5)2O5+[delta] upon high-pressure heat treatment. Physical Review B. Volume 58, Issue 6. 3371-3376. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.58.3371.