La[sub 2]O[sub 3]-CuO-TiO[sub 2] phase diagram and the crystal structure of [La[sub 0. 86][open square][sub 0. 14]Cu[sub 3]](Ti[sub 3. 42]Al[sub 0. 58])O[sub 12]

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1094· OSTI ID:6351938

Anderson, M T; Balbarin, V E; Groenke, D A; Bain, G A; Poeppelmeier, K R ^[1]

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1. Northwestern Univ., Evanston, IL (United States)

The La[sub 2]O[sub 3]-CuO-TiO[sub 2] system in air at 960[degrees]C contains two perovskite-related ternary compounds, La[sub 2]CuTiO[sub 6] and [La[sub 2/3][open square][sub 1/3]Cu[sub 3]](Ti[sub 4])O[sub 12]. The former is orthorhombic, has cell parameters a = 5.587 (6), b = 5.616 (5), c = 7.842 (7) [Angstrom], is isostructural with GdFeO[sub 3], and exhibits Curie-Weiss magnetic behavior. The copper and titanium are statistically distributed over one crystallographic site. The La[sub 2]O[sub 3]-CuO-TiO[sub 2] and La[sub 2]O[sub 3]-CuO-SnO[sub 2] systems differ in their phase relationships, number of ternary phases, and crystal chemistry of their La[sub 2]CuMO[sub 6] (M = Ti, Sn) compounds. Single crystals of [La[sub 0.86][open square][sub 0.14]Cu[sub 3]](Ti[sub 3.42]Al[sub 0.58])O[sub 12] were grown in an Al[sub 2]O[sub 3] crucible from a CuO-TiO[sub 2] flux and crystallize in the cubic space group Im[bar 3] with a = 7.421 (1) [Angstrom] and Z = 2. The compound is isostructural with [CaMn[sub 3]](Mn[sub 4])O[sub 12]. The excess lanthanum in the crystal compensates the charge deficiency brought about by the aluminum incorporation, and the electrostatic stabilization it affords is the principal driving force for the observed structure. 33 refs., 7 figs., 4 tabs.

• OSTI ID: 6351938
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 103:1; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIAGRAMS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LATTICE PARAMETERS
MAGNETIC PROPERTIES
MINERALS
ORTHORHOMBIC LATTICES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE DIAGRAMS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS