Crystal structure of BaLa{sub 4}Ti{sub 4}O{sub 15}, member n = 5 of the homologous series (Ba, La){sub n}Ti{sub n{minus}1}O{sub 3n} of cation-deficient perovskite-related compounds

Journal Article · Thu Oct 01 00:00:00 EDT 1998 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(98)00148-2· OSTI ID:655382

Harre, N; Mercurio, D; Trolliard, G; Frit, B ^[1]

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1. ESA-CNRS, Limoges (France). Lab. de Materiaux Ceramiques et Traitements de Surface

BaLa{sub 4}Ti{sub 4}O{sub 15} crystallizes in the trigonal system (space group P{bar 3}c1) with the unit-cell parameters a = 5.5720(10) and c = 22.500(2) {angstrom}; Z = 2. The structure has been solved from single crystal X-ray diffraction data to a final R{sub 1} = 0.0336. Ba and La atoms are 12-fold coordinated and Ti atoms are 6-fold coordinated. The structure can be described as consisting of identical perovskite-like blocks, four corner-sharing TiO{sub 6} octahedra thick, separated by layers of vacant octahedra. The distortion of the cation and anion sublattices has been analyzed and a Ba/La order has been observed.

• OSTI ID: 655382
• Journal Information: Materials Research Bulletin, Vol. 33, Issue 10; Other Information: PBD: Oct 1998
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
BARIUM OXIDES
LANTHANUM OXIDES
TITANIUM OXIDES
LATTICE PARAMETERS
X-RAY DIFFRACTION
PEROVSKITE