Na2V3P2O13: Préparation et structure cristalline

✍ Scribed by Amor Haddad; Tahar Jouini

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 184 KB
• Volume: 112
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1994.1294

✦ Synopsis

(\mathrm{Na}{2} \mathrm{~V}{3} \mathrm{P}{2} \mathrm{O}{13}) was synthesized by a solid state reaction at (540^{\circ} \mathrm{C}). His orthorhombic, Pccn, with (a=10.186(4), b=11.976(3), c=) (8.377(4) \AA, V=1022.0 \AA^{3}, Z=4). The structure was solved and refined to (R=0.0517) and (R_{\mathrm{w}}=0.0417) for 1239 independent reflections. It is built from (\mathrm{PO}{4}) tetrahedra, (\mathrm{V}^{\vee} \mathrm{O}{5}) square pyramids, and (\mathrm{V}^{1{ }^{1}} \mathrm{O}{6}) octahedra sharing corners to form a three-dimensional framework. The structure can be decomposed into layers of tetrahedra and square pyramids, showing large windows, linked together by infinite (\mathrm{V}^{\mathrm{VV}} \mathrm{O}{6}) chains running parallel to the layers in the (\mathrm{c}) direction, and delimiting large tunnels in the interlayer space where the sodium ions are located. 1994 Academic Press, Inc.