The Synthesis and Structural Characterization of Na3WO3N

✍ Scribed by S.H. Elder; F.J. DiSalvo; J.B. Parise; J.A. Hriljac; James W. Richardson Jr.

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 381 KB
• Volume: 108
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1994.1011

✦ Synopsis

We report the discovery of a new ternary oxynitride, (\mathrm{Na}{3} \mathrm{WO}{3} \mathrm{~N}). (\mathrm{Na}{3} \mathrm{WO}{3} \mathrm{~N}) is synthesized by exposing a eutectic melt consisting of (\frac{1}{2} \mathrm{Na}{2} \mathrm{O}: 1 \mathrm{Na}{2} \mathrm{WO}{4}) to a flow of ammonia gas at (695^{\circ} \mathrm{C}). The compound crystallizes in the acentric space group (P m n 2{1}) with (a=) (7.2481(3) \AA, b=6.2728(3) \AA), and (c=5.6493(2) \AA). The structure was determined from synchrotron (X)-ray powder diffraction data and refined using the Rietveld analysis on neutron powder diffraction data. It is isostructural to the low temperature form of (\mathrm{Li}{3} \mathrm{PO}{4}) which can be derived from an ordered wurtzite structure-type with all the atoms having tetrahedral coordination. Alternatively, the structure can be described as being "salt-like" consisting of isolated (\left(\mathrm{WO}_{3} \mathrm{~N}\right)^{-3}) tetrahedral polyanions separated by (\mathrm{Na}^{+}). O 1994 Academic Press, Inc.