Delacotte Charlène, Pérez Olivier, Pautrat Alain, Berthebaud David, Hébert Sylvie, Suard Emmanuelle, Pelloquin Denis, Maignan Antoine
†Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.
‡Institut Laue-Langevin (ILL), 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France.
Inorg Chem. 2015 Jul 6;54(13):6560-5. doi: 10.1021/acs.inorgchem.5b00879. Epub 2015 Jun 18.
Single crystals of the stoichiometric iron calcium oxysulfide CaOFeS have been grown by a solid-state reaction. Structural analysis of CaOFeS at room temperature by combining single-crystal X-ray diffraction data and transmission electron microscopy leads to a stoichiometric hexagonal noncentrosymmetric P63mc layered structure isostructural to CaOZnS. It is built from alternating layers made of FeOS3 tetrahedra sharing sulfur apexes and stacked with Ca(2+) planes. All Fe-O bonds are parallel to the stacking axis; this breaks the centrosymmetry, leading to a polar structure. The dielectric measurements reveal the existence of a magnetodielectric effect near 33 K in good agreement with the Neel temperature, as evidenced near 35 K by specific heat measurements reported by a different group.
