Abstract
Pure manganese benavidesite (MnPb 4Sb 6S 14) has been synthesized from a solid state reaction of MnS, PbS and Sb 2S 3 at 600 °C, and its crystal structure determined. Benavidesite is isotypic of natural jamesonite (FePb 4Sb 6S 14), for which a new structure refinement was performed. Both compounds crystallize in the monoclinic symmetry, space group P2 1/ c (No. 14), with unit cell parameters (jamesonite/benavidesite) a=4.0235/4.0216, b=19.074/19.178, c=15.737/15.837 Å and β=91.89/91.89°, Z=2. The projection of the structure along a shows rods (Pb 4Sb 6S 14) ∞ parallel to a , connected along c by iron/manganese atoms with octahedral coordination. Octahedra are connected by two opposite edges, forming single chains parallel to a . Magnetic properties have been studied. Jamesonite susceptibility shows an antiferromagnetic behavior below 30 K with an irregularity at about 5 K. Above 30 K, benavidesite and jamesonite have the same behavior but, at low temperature, benavidesite exhibits a paramagnetic behavior.
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