Magnetic properties of a new cobalt hydrogen vanadate with a dumortierite-like structure: Co-13.5(OH)(6)(H0.5VO3.5)(2)(VO4)(6)

International audienceThe magnetic properties of a novel cobalt-based hydrogen vanadate, Co-13.5(OH)(6)(H0.5VO3.5)(2)(VO4)(6), are reported. This new magnetic material was synthesized in single-crystal form using a conventional hydrothermal method. Its crystal structure was determined from single-crystal X-ray diffraction data and was also characterized by scanning electron microscopy. Its crystal framework has a dumortierite-like structure consisting of large hexagonal and trigonal channels; the large hexagonal channels contain one-dimensional chains of face-sharing CoO6 octahedra linked to the framework by rings of VO4 tetrahedra, while the trigonal channels are occupied by chains of disordered V2O4 pyramidal groups. The magnetic properties of this material were investigated by DC magnetic measurements, which indicate the occurrence of antiferromagnetic interactions