Abstract
The crystal chemistry of a new structure type found in the Pb−M−B−O system, PbMBO4 (M = Al, Ga), was extended to include M = Cr, Mn, and Fe. Extension to other trivalent ions, such as Ti, V, Co, Sc, In, and Y, failed for various reasons. Single crystals were grown from a PbO flux for M = Mn and Fe and the crystal structures were solved from X-ray single-crystal diffraction data. For M = Cr, the structure was refined from neutron powder diffraction data. The crystal structure is described in Pnma and features chains of edge-sharing MO6 octahedra extended along the b-axis. Rigid, planar BO3 groups bridge the MO6 octahedra both within and between the chains, forcing the two M−O−M bridging angles involved in the shared edge to be highly asymmetric and constraining the M−M distances to be roughly constant at 2.97 A. In all cases, one-dimensional short-range magnetic correlations were observed in the magnetic susceptibility data which were antiferromagnetic for M = Cr and Fe and ferromagnetic for M = Mn. Values...
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