Bond lengths in ‘CaMn3’ (Mn4)O12: A new Jahn-Teller distortion of Mn3+ octahedra |
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| Authors: | B Bochu JL Buevoz J Chenavas A Collomb JC Joubert M Marezio |
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| Institution: | I.N.P.G., B.P. 46, 38042 St. Martin d''Hères, France;I.L.L., Grenoble, France;Laboratoire de Cristallographie, C.N.R.S., B.P. 166, 38042 Grenoble, France |
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| Abstract: | The crystal structure of CaMn3] (Mn4)O12 has been refined with the Rietveld method by using neutron powder diffraction data. This compound is trigonal with the perovskite-like NaMn3] (Mn4)O12 arrangement. The trigonality is due to the 1:3 order between Mn4+ and Mn3+ on the octahedral sites. CaMn3] (Mn4)O12 contains two different types of Mn3+ Jahn-Teller distorted polyhedra: the first, which is found in all the AC3B4O12 compounds is a rhombic prism, while the second is an apically contracted octahedron, which represents a new type of Jahn-Teller distortion for Mn3+ cations in oxide compounds. |
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