Synthesis and crystal structure of BiCd2AsO6

A new compound BiCd2AsO6 has been prepared and its crystal structure determined by single crystal X-ray diffraction. The unit cell parameters are: a=8.618(1)Å, b=11.949(2)Å and c=5.4407(7)Å and the space group Cmc21. BiCd2AsO6 is therefore noncentrosymmetric and polar. It contains seven coordinate Bi and Cd atoms, and As in AsO4 tetrahedral groups aligned in the same direction along the polar axis of the crystal.