Préparation et structure cristalline d’un nouveau matériau non centrosymétrique NaMoO2AsO4

✍ Scribed by Mohamed Faouzi Zid; Ahmed Driss; Tahar Jouini

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 524 KB
• Volume: 133
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7480

✦ Synopsis

A new molybdenylarsenate NaMoO 2 AsO 4 has been isolated. The single-crystal X-ray diffraction study of this phase has shown that it is noncentrosymmetric. It crystallizes in the Pca2 1 (No. 29) space group with a‫,)3(177.41؍‬ b‫,)2(665.6؍‬ c"10.101(1) A s , Z‫,8؍‬ V‫)4(7.979؍‬ A s 3 , R(F 2 ‫,920.0؍)‬ and wR 2 (F 2 ‫370.0؍)‬ for 1209 independent reflections with F 2 > 4 (F 2 ). The structure consists of MoO 6 octahedra and AsO 4 tetrahedra sharing corners to build up a three-dimensional framework which has large tunnels where the Na ؉ cations reside. Relationships with analogous phosphates and arsenates NaMoO 2 PO 4 , KMoO 2 AsO 4 , KMoO 2 PO 4 , Ba(MoO 2 ) 2 (PO 4 ) 2 , and Pb(MoO 2 ) 2 (PO 4 ) 2 are discussed.