Synthesis, Crystal Structure and Electrical Properties of the Molybdenum Oxide Na1.92Mg2.04Mo3O12

New molybdenum oxide Na1.92Mg2.04Mo3O12 has been synthesized by the solid state method. The title compound crystallizes in the triclinic system (space group P-1). The unit cell parameters are a = 6.9660(7) Å, b = 8.6352(8) Å, c = 10.2501(8) Å, α = 106.938(1)°, β = 104.825(1)°, γ = 103.206(1)°, V = 538.72(9) Å3, and Z = 2. The compound is isotypical to Ag2M2(MoO4)3 (M = Zn, Mg, Co, Mn). The structure can be described as a three-dimensional anionic mixed framework of MoO4 tetrahedra and pairs of Mg2O10 octahedra sharing common edges. The Na+ ions are disordered and located in the voids forming infinite channels running along the direction [100]. The electrical conductivity investigated from 693 K to 793 K by AC impedance spectroscopy is low ( S cm−1 at 683 K)