Original paper

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

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European Journal of Mineralogy Volume 5 Number 2 (1993), p. 207 - 214

17 references

published: Apr 19, 1993
manuscript accepted: Dec 16, 1992
manuscript received: Aug 15, 1992

DOI: 10.1127/ejm/5/2/0207

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Abstract

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.

Keywords

NaCdIn2(PO4)3 • alluaudite structure-type • solid-state reaction • X-ray Rietveld refinement • infrared • Raman spectroscopy