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Spontaneous ferromagnetism at room temperature in oxygen-rich dicalcium cuprate Ca2CuO3+δ

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Abstract

Stoichiometric Ca2CuO3, having square-planar Cu-chains [C. L. Teske and H. Müller-Buschbaum, Z. Anorg. Allg. Chem. 379, 234 (1970); M. Hjorth and J. Hyldtoft, Acta Chem. Scand. 44, 516 (1990)], is expectedly antiferromagnetic due to 1D intrachain superexchange [K. Okuda, S. Noguchi, K. Konishi, H. Deguchi, and K. Takeda, J. Magn. Magn. Mater. 104–107, 817 (1992)]. Nonetheless, we report remarkable spontaneous ferromagnetism at 293 K after sintering, prominently in oxygen. This apparently introduced excess oxygen at vacant quasioctahedral sites, promoting spin-flip and ferromagnetic interchain coupling. Thermogravimetry (TGA) revealed excess oxygen, ≈0.17 O/Cu. X-ray diffraction (XRD) yielded a comparatively smaller unit cell. Ferromagnetism disappeared by oxygen depletion, mimicking reported nonmagnetism of Ca2CuO3−δ [Okuda et al. (1992)]. Elemental analysis showed insignificant magnetic impurity traces. Tc ranged between 680 K and 723 K, depending on freshness and purity. Saturation magnetization varied with processing, optimally 0.30 A · m2/kg at 1.0 T applied field. Coercivity and remanence varied with purity.

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Author notes

  1. Richard S. Burrows

    Present address: Da-Lite, Ohio, P.O. Box 62268, 45262, Cincinnati, USA

Authors and Affiliations

  1. Department of Electrical and Computer Engineering, University of Cincinnati, USA

    Mahjoub A. Abdelgadir

  2. Department of Physics, North Carolina A&T State University, North Carolina, 27411, Greensboro, USA

    Mahjoub A. Abdelgadir

  3. Department of Chemistry, University of Cincinnati, Ohio, 45221, Cincinnati, USA

    Richard S. Burrows & Darl H. McDaniel

Authors
  1. Mahjoub A. Abdelgadir
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  2. Richard S. Burrows
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  3. Darl H. McDaniel
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Abdelgadir, M.A., Burrows, R.S. & McDaniel, D.H. Spontaneous ferromagnetism at room temperature in oxygen-rich dicalcium cuprate Ca2CuO3+δ. Journal of Materials Research 11, 1804–1809 (1996). https://doi.org/10.1557/JMR.1996.0227

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  • DOI: https://doi.org/10.1557/JMR.1996.0227

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