Acta Crystallographica Section C

Crystal Structure Communications

Volume 61, Part 2 (February 2005)

inorganic compounds

Acta Cryst. (2005). C61, i9-i13 [doi:10.1107/S0108270104030525]

Two new phosphate langbeinites, Rb₂YbTi(PO₄)₃ and Rb₂Yb_0.32Ti_1.68(PO₄)₃, investigated at 293 and 150 K

J. C. M. Gustafsson, S. T. Norberg, G. Svensson and J. Albertsson

Abstract: The rubidium ytterbium titanium phosphates Rb₂YbTi(PO₄)₃, (I), and Rb₂Yb_0.32Ti_1.68(PO₄)₃, (II), have been structurally characterized from X-ray data collected at both 293 and 150 K. Compound (II) is blue owing to the presence of mixed-valence titanium (41% Ti³⁺ + 59% Ti⁴⁺). Both (I) and (II) belong to the langbeinite structure type, with mixed Yb/Ti populations in the two crystallographically independent octahedral sites (of symmetry 3). Ytterbium favours one of these sites, where about two-thirds of the Yb atoms are found. The O-atom displacement parameters are large in both compounds at both temperatures.

Formula: Rb₂YbTi(PO₄)₃ and Rb₂Yb_0.32Ti_1.68(PO₄)₃


	Structure factor file (CIF format) (64.1 kbytes) Contains datablock I_293_K

	Structure factor file (CIF format) (64.5 kbytes) Contains datablock I_150_K

	Structure factor file (CIF format) (37.7 kbytes) Contains datablock II_293_K

	Structure factor file (CIF format) (38.4 kbytes) Contains datablock II_150_K

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