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Antenucci, D.; Miehe, G.; Tarte, P.; Schmahl, Wolfgang W.; Fransolet, A. (1993): Combined X-ray Rietveld, infrared and Raman study of a new synthetic variety of alluaudite, NaCdIn2(PO4)3. In: European Journal of Mineralogy, Vol. 5, No. 2: pp. 207-213
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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, β = 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(1), X(2) empty, Cd2+ in M(1), and In3+ in M(2), leading to the structural formula □ NaCdIn2(PO4 )3, where □ denotes lattice vacancies. -Authors