Ca25Co22O56(OH)28: A layered misfit compound |
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| Affiliation: | 1. Department of Chemistry, Princeton University, Princeton, NJ 08544, United States;2. Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80-952 Gdansk, Poland;3. National Center for HREM, Department of Nanoscience, Delft University of Technology, Rotterdamseweg 137, 2682 AL Delft, The Netherlands;4. Department of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2682 AL Delft, The Netherlands;5. Department of Physics, Princeton University, Princeton, NJ 08544, United States;1. Department of Information Physics and Computing, Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Department of Mathematical Engineering and Information Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. Research Fellow of the Japan Society for the Promotion of Science, Japan;1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;2. Physics department, Sichuan Normal University, Chengdu 610068, China;1. Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany;2. FR 8.1 Universität des Saarlandes, Postach 151150, 66041 Saarbrücken, Germany;3. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China;4. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany |
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| Abstract: | The high pressure synthesis, structure and magnetic properties of Ca25Co22O56(OH)28 are reported. The compound has a misfit structure, consisting of double, square calcium oxide hydroxide rock-salt-like layers between hexagonal CoO2 layers. The misfit compound crystallizes in the monoclinic space group C2/m, and can be characterized by the coexistence of two subsystems with common a = 4.893(5) Å, c = 8.825(9) Å and β = 95.745(8) parameters, and different b parameters: bRS = 4.894(5) Å, and bHEX = 2.809(3) Å, for the rock-salt and hexagonal type planes, respectively. The compound shows Curie–Weiss paramagnetism with an antiferromagnetic Weiss temperature of ?43 K and a reduced Co moment. Substantial deviations from Curie–Weiss behavior are seen below 50 K with no indication of magnetic ordering. No superconductivity was observed down to a temperature of 2 K. |
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