Quadruple-layered perovskite (CuCl)Ca2NaNb4O13 |
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| Authors: | A Kitada Y Tsujimoto T Yamamoto Y Kobayashi Y Narumi K Kindo AA Aczel GM Luke YJ Uemura Y Kiuchi Y Ueda K Yoshimura Y Ajiro H Kageyama |
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| Institution: | 1. Department of Energy and Hydrocarbon Chemistry, Faculty of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan;2. Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan;3. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan;4. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan;5. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1;6. Department of Physics, Columbia University, New York, NY 10027, USA;7. Institute for Integrated Cell-Material Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan;8. CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan |
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| Abstract: | We will present the synthesis, structure and magnetic properties of a new quadruple-layered perovskite (CuCl)Ca2NaNb4O13. Through a topotactic ion-exchange reaction with CuCl2, the precursor RbCa2NaNb4O13 presumably having an incoherent octahederal tliting changes into (CuCl)Ca2NaNb4O13 with a 2ap×2ap×2cp superstructure (tetragonal; a=7.73232(5) Å, c=39.2156(4) Å). The well-defined superstructure for the ion-exchanged product should be stabilized by the inserted CuCl4O2 octahedral layers that firmly connect with neighboring perovskite layers. Magnetic studies show the absence of long-range magnetic ordering down to 2 K despite strong in-plane interactions. Aleksandrov′s group theory and Rietveld refinement of synchrotron X-ray diffraction data suggest the structure to be of I4/mmm space group with in-phase tilting along the a and b axes, a two-tilt system (++0). |
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