Quadruple-layered perovskite (CuCl)Ca2NaNb4O13
| Autor: | Yoshihiro Tsujimoto, Yoji Kobayashi, Graeme Luke, Takafumi Yamamoto, Koichi Kindo, Adam A. Aczel, Yoshitami Ajiro, Yoko Kiuchi, Yutaka Ueda, Yasutomo J. Uemura, Hiroshi Kageyama, Kazuyoshi Yoshimura, Atsushi Kitada, Yasuo Narumi |
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| Rok vydání: | 2012 |
| Předmět: |
Superstructure
Chemistry Rietveld refinement Inorganic chemistry Space group Crystal structure Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Magnetization Tetragonal crystal system Crystallography Octahedron Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Perovskite (structure) |
| Zdroj: | Journal of Solid State Chemistry. 185:10-17 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2011.10.038 |
| Popis: | We will present the synthesis, structure and magnetic properties of a new quadruple-layered perovskite (CuCl)Ca{sub 2}NaNb{sub 4}O{sub 13}. Through a topotactic ion-exchange reaction with CuCl{sub 2}, the precursor RbCa{sub 2}NaNb{sub 4}O{sub 13} presumably having an incoherent octahederal tliting changes into (CuCl)Ca{sub 2}NaNb{sub 4}O{sub 13} with a 2a{sub p} Multiplication-Sign 2a{sub p} Multiplication-Sign 2c{sub p} superstructure (tetragonal; a=7.73232(5) A, c=39.2156(4) A). The well-defined superstructure for the ion-exchanged product should be stabilized by the inserted CuCl{sub 4}O{sub 2} 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 Prime 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). - Graphical Abstract: We present a quadruple-layered copper oxyhalide (CuCl)Ca{sub 2}NaNb{sub 4}O{sub 13} synthesized through a topotactic ion-exchange reaction of RbCa{sub 2}NaNb{sub 4}O{sub 13} with CuCl{sub 2}. The compound has a well-defined superstructure. Magnetic studies suggest the absence of magnetic order even at 2 K. Highlights: Black-Right-Pointing-Pointer (CuCl)Ca{sub 2}NaNb{sub 4}O{sub 13} was prepared by ion-exchange reaction of RbCa{sub 2}NaNb{sub 4}O{sub 13} with CuCl{submore » 2}. Black-Right-Pointing-Pointer Compound has a 2a{sub p} Multiplication-Sign 2a{sub p} Multiplication-Sign 2c{sub p} superstructure (tetragonal; a=7.73 A, c=39.21 A). Black-Right-Pointing-Pointer Such a well-defined superstructure was not observed in the precursor compound. Black-Right-Pointing-Pointer Aleksandrov Prime s theory and Rietveld study suggest a (++0) octahedral tilting (I4/mmm). Black-Right-Pointing-Pointer Magnetic studies revealed the absence of magnetic order down to 2 K.« less |
| Databáze: | OpenAIRE |
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