Low-temperature ordered phase of CaU(PO4)2: synthesis and crystal structure
Dusausoy, Yves; Ghermani, Nοur-Eddine; Podor, Renaud; Cuney, Michel
European Journal of Mineralogy Volume 8 Number 4 (1996), p. 667 - 674
published: Jul 29, 1996
manuscript accepted: Feb 29, 1996
manuscript received: May 10, 1995
ArtNo. ESP147050804002, Price: 29.00 €
Abstract The crystal structure of the new compound CaU(PO4)2 was determined from X-ray single-crystal data and refined to R(F) = 0.025 and RW(F) = 0.023 for 993 independent observed reflections. The unit cell is orthorhombic, a - 13.926(4) Å, b - 6.958(3) Å and c = 6.136(2) Å, space group Pnma. The structure is Ca, U ordered and in some aspects similar to the xenotime and anhydrite structure. The coordination polyhedra for the large metal ions are described as semi regular trigonododecahedra.