Combined X-ray Rietveld, infrared and Raman study of a new synthetic variety of alluaudite, NaCdIn2(PO4)3
Antenucci, Diano; Miehe, Gerhard; Tarte, Pierre; Schmahl, Wolfgang W.; Fransolet, André-Mathieu
European Journal of Mineralogy Volume 5 Number 2 (1993), p. 207 - 214
published: Apr 27, 1993
manuscript accepted: Dec 16, 1992
manuscript received: Aug 15, 1992
ArtNo. ESP147050502012, Price: 29.00 €
Abstract NaCdIn2(PO4)3, a new phase with an alluaudite-type structure, has been synthesized by solid-state reaction. The unit-cell is monoclinic, space group C2/c. Parameters refined from the X-ray powder diffractogram are a = 12.519(2), b = 12.959(3), c = 6.575(1) Å, ß = 115.17(1)°. The combined results of X-ray Rietveld refinement and vibrational spectroscopy (infrared and Raman) confirm the following cationic distribution: Na+ in X(l), X(2) empty, Cd2+ in M(l), and In3+ in M(2), leading to the structural formula □ NaCdIn2(PO4)3, where □ denotes lattice vacancies.