Pale blue powders of NaZnVOPO4(HPO4) were prepared in quantitative yield from hydrothermal treatments. The structure of NaZnVOPO4(HPO4) was solved from single crystal X-ray diffraction data in the centrosymmetric monoclinic space group P21/c (no. 14), a = 8.5441 (2) Å, b = 8.9831(2) Å, c = 9.0836(2) Å, β=91.241(1)°, Z=4 (R1(Fo)=0.026, wR2(Fo2)=O.068). The structure results from the hetero-condensation of distorted octahedra VO6 with tetrahedra HxPO4 and ZnO4 by sharing apices and edges. The remaining voids of the 3D framework [ZnVOPO4(HPO4)]- located in tunnels that run along  are occupied by sodium ions. The title compound dehydrates at T∼770 K with an overall weight loss of ∼2.3% consistent with the structural results. The crystal chemical relationships with Na3VOPO4(HPO4) and the high-temperature phase SrZnVO(PO4)2 are discussed.
ASJC Scopus subject areas
- Materials Chemistry