Reference

The Structure of Na2W2O7×1/2H2O Synthesized under High Pressure and Temperature

The Structure of Na2W2O7×1/2H2O Synthesized under High Pressure and Temperature. Dahlborg, Magnus Asberg; Svensson, Goeran; Valkeapaeae, Markus ( Department of Inorganic Chemistry, Chalmers University of Technology, Goteborg SE-412 96, Swed.). Journal of Solid State Chemistry, 167(2), 525-533 (English) 2002 Elsevier Science. CODEN: JSSCBI. ISSN: 0022-4596.Chemicals with cas numbers 10213-10-2 and 7790-78-5 also play role. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 75 A new compd., Na2W2O7×0.5H2O, was found in the Na2O-WO3-H2O system. It is the 4th compd. in the Na2W2O7×xH2O system and the 2nd phase contg. H2O. The crystals were prepd. at a pressure of 1.5 GPa and a temp. of 900°. Na2W2O7×0.5H2O crystallizes in the triclinic space group, P;, Z = 2, with a 8.4902(6), b 7.6636(6), c 5.1501(3) ?, a 91.959(7), b 96.521(8) and g 111.678(7)°. The structure is built up from double chains of WO6 octahedra running along c, interconnected by two-dimensional nets of NaO6 polyhedra. Na coordinates to six oxygens forming both octahedra and trigonal prisms. .