Valdecir Biondo, Paulo W. C. Sarvezuk, Flávio F. Ivashita, Klebson L. Silva, Andrea Paesano Jr. e Maurice O. Isnard

Materials Research Bulletin – Volume: 54; Pages: 41–47; DOI: 10.1016/j.materresbull.2014.03.008

RE2O2S oxysulfides (with RE = Sm, Eu and Gd) were prepared and characterized regarding their structural and magnetic properties. The compounds crystallized in the trigonal symmetry (space group P-3m/View the MathML sourceD33d), with the lattice parameter varying linearly with the ionic radius of the RE cation. All these oxysulfides are magnetically frustrated and only the gadolinium sample showed magnetic order down to 3 K. The magnetic frustration is attributed to the spatial distribution of cations over the lattice, where the RE’s magnetic moments occupy the sites forming a triangular plane lattice, perpendicular to the direction. This geometric magnetic frustration was firstly recognized for these oxysulfides.