Five-dimensional structure refinement of natural melilite, (Ca1.89Sr0.01Na0.08K0.02)(Mg0.92Al0.08)-(Si1.98Al0.02)O-7

The structure of a crystal of natural melilite from San Venanzo, Umbria (Italy) of the general formula X(2)T1(T2)(2)O-7, where X = Ca0.945Sr0.005Na0.04K0.01, T1 = Mg0.92Al0.08 and T2 = Si0.99Al0.01, has been solved and refined as an incommensurate structure in five-dimensional superspace. The structure is tetragonal, superspace group P (4) over bar2(1)m:p4mg, cell parameters a = 7.860 (1), c =5.024 (1) Angstrom, modulation vectors q(1) = 0.2815 (3)(a* +b*), q(2) = 0.2815 (3)(-a* +b*). The data collection was performed on a KumaCCD diffractometer. The structure was refined from 7606 reflections to final R = 0.0481. A special modification of the refinement program Jana2000 was necessary to take into account overlapping of satellite reflections m x n = +/- 1, which could not be properly separated in the integration procedure. The final model includes modulations of the atomic positions as well as modulations of the thermal parameters. The latter are induced by strong differences in the neighbourhood of the actual modulated positions. The occupational modulation was neither significant for X nor for T1 sites and the sites were supposed to be occupied only by Ca and Mg, respectively. As a consequence of the Ca and O positional modulations six-, seven- and eightfold Ca coordination occur throughout the structure and the thermal ellipsoid changes its shape correspondingly. The positional modulation of the atoms causes variations in the interatomic distances which, however, do not affect bond-valence sums considerably, but induce flattening and rotation in T1 and T2 tetrahedra, respectively. [References: 23] 23

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Acta Crystallographica - Section B, Structural Science, 57, Part 6, 739-746
English Article Current Contents(R)/Physical, Chemical & Earth Sciences. Reprint available from: Petricek V Acad Sci Czech Republ, Inst Phys Na Slovance 2 Prague 18221 Czech Republic Acad Sci Czech Republ, Inst Phys Prague 18221 Czech Republic Univ Lausanne, Inst Crystallog, BSP Dorigny CH-1015 Lausanne Switzerland Univ Florence, Dipartimento Sci Terra I-50121 Florence Italy 0002 Acta Crystallogr. Sect. B-Struct. Sci

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