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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© 1998 American Physical Society (APS). This is the accepted version of the following article: 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, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.58.3371.
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School of Chemical Technology |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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3371-3376
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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
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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.