Synthesis of ternary potassium, magnesium, and zirconium molybdates. The crystal structure of K{sub 5}(Mg{sub 0.5}Zr{sub 1.5}){center_dot}(MoO{sub 4}){sub 6}
- and others
Three (5:1:3, 1:1:1, and 2:1:6) ternary phases were discovered in the K{sub 2}MoO{sub 4}-AMoO{sub 4}-Zr(MoO{sub 4}){sub 2} system, where A is Mg or Mn. For A = Mg, the authors have synthesized 5:1:3 single crystals and determined their crystal structure from X-ray diffraction data (a CAD-4 automatic diffractometer, MoK{sub a} radiation, 1166 F(hkl), and R = 0.026). The compound crystallizes in the trigonal system with space group R3c, a = 10.576(1), c = 37.511(3) {Angstrom}, Z = 6, d{sub calc} = 3.576, and d{sub msd} = 3.54 g/cm{sup 3}. The structure is a three-dimensional composite framework of alternating Mo tetrahedra and (Mg, Zr) octahedra, which are linked via the common {Omicron} vertices. Potassium atoms of three kinds are located in large framework cavities. Their polyhedra (ten-vertex polyhedra and a cubeoctahedron) are linked together by common faces and edges to form infinite zigzag columns of a large section. When solving the structure, the authors refined the composition of the crystals and the distribution of Mg{sup 2+} and Zr{sup 4+} cations in the M(1) and M(2) positions resulting in the formula above.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 175739
- Journal Information:
- Journal of Structural Chemistry, Vol. 35, Issue 3; Other Information: PBD: Nov 1994; TN: Translated from Zhurnal Strukturnoi Khimii; 35: No. 3, 11-15(May-Jun 1994)
- Country of Publication:
- United States
- Language:
- English
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