Contribution
Crystal Structure Of Shomiokite-(Y), Na3Y(CO3)3 3H2O
Rastsvetaeva, Ramiza K.; Pushcharovsky, Dmitry Yu.; Pekov, Igor V.
European Journal of Mineralogy Volume 8 Number 6 (1997), p. 1249 - 1256
17 références bibliographiques
publié: Jan 8, 1997
manuscrit accepté: Jul 26, 1996
manuscrit reçu: Feb 13, 1996
DOI: 10.1127/ejm/8/6/1249
Abstract
Abstract Shomiokite, Na3Y(CO3)3 3H2O, M = 391.9, orthorhombic, space group Pna21, a = 17.358(8), b = 10.034(4), c = 5.946 (2) Å, V = 1035.6 Å3, Z = 4, p0 = 2.52, pc = 2.51 g/cm3, λ(MoKα) = 0.71073 Å, μ = 60.2 cm-1, dimensions (mm) 0.25 x 0.1 x 0.1, F(000) = 768, room temperature, R = 0.059 for 1973 reflections with |F|> 3σ(F). The structure contains isolated mixed complexes, formed by YO9 polyhedra, which share three edges with CO3 groups. The mixed complexes are considered as relicts of corrugated polyhedral layers, described in tengerite, kimuraite and lokkaite, and are connected through distorted Na octahedra, 5-fold polyhedra and a system of H-bonds.
Mots-clefs
shomiokite-(Y) • crystal structure • carbonate