The Crystal Chemistry of Lithium in the Alluaudite Structure: A Study of the (Na1−xLix)CdIn2(PO4)3 Solid Solution (x=0 to 1)

✍ Scribed by Frédéric Hatert; Diano Antenucci; André-Mathieu Fransolet; Monique Liégeois-Duyckaerts

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 538 KB
• Volume: 163
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9392

✦ Synopsis

Several compounds of the (Na 1؊x Li x )CdIn 2 (PO 4 ) 3 solid solution were synthesized by a solid-state reaction in air, and pure alluaudite-like compounds were obtained for x ‫؍‬ 0.00, 0.25, and 0.50. X-ray Rietveld re5nements indicate the occurrence of Cd 2؉ in the M(1) site, and of In 3؉ in the M(2) site of the alluaudite structure. This non-disordered cationic distribution is con5rmed by the sharpness of the infrared absorption bands. The distribution of Na ؉ and Li ؉ on the A(1) and A(2) crystallographic sites cannot be accurately assessed by the Rietvled method, probably because the electronic densities involved in the Na ؉ P PLi ؉ substitution are very small. A comparison with the synthetic alluaudite-like compounds, (Na 1؊x Li x )MnFe 2 (PO 4 ) 3 , indicates the in6uence of the cations occupying the M(1) and M(2) sites on the coordination polyhedra morphologies of the A(1) and A(2) crystallographic sites.