Two new glaserite-type orthovanadates: RbKDy(VO) and CsKGd(VO).

The crystal structures of dirubidium potassium dysprosium bis-(vanadate), RbKDy(VO), and caesium potassium gadolinium bis-(vanadate), CsKGd(VO), were solved from single-crystal X-ray diffraction data. Both compounds, synthesized by the reactive flux method, crystallize in the space group 1 with the glaserite structure type. VO tetra-hedra are linked to DyO or GdO octa-hedra by common vertices to form sheets stacking along the axis. The large twelve-coordinate Cs or Rb cations are sandwiched between these layers in tunnels along the and axes, while the K cations, surrounded by ten oxygen atoms, are localized in cavities.