The distorted perovskite Sr(Na sub 1/4 Sb sub 3/4 )O sub 3 : A novel example of 1:3 B-cation ordering
- Instituto de Ciencia de Materiales, Madrid (Spain)
Powder neutron diffraction data ({lambda} = 1.909 {angstrom}), have been used to refine the crystal structure of the ordered perovskite Sr(Na{sub 1/4}Sb{sub 3/4})O{sub 3} at 295 K. This compound is monoclinic, a = 8.0913(2), b = 8.0871(1), c = 8.0918(2) {angstrom}, {beta} = 89.953(1){degree}, with space group P2{sub 1}/n, Z = 8. R{sub p} = 4.27, R{sub wp} = 5.43, and R{sub z} = 3.44. The fairly distorted NaO{sub 6} and SbO{sub 6} octahedra, ordered in a 1:3 three-dimensional arrangement, are titled according to a system similar to that of the GdFeO{sub 3} structure. The tilting angles for the four kinds of octahedra have been obtained from the atomic positional parameters. Sr atoms are in strongly asymmetrical environments, coordinated to 13 oxygens, in agreement with bond-valence calculations.
- OSTI ID:
- 6623834
- Journal Information:
- Journal of Solid State Chemistry; (USA), Vol. 84:1; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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