Synthesis and crystal structure determination of LaAuO[sub 3]
- Universitaet Bonn, Gerhard-Domagk-Strasse (Germany)
A new ternary oxide of gold and lanthanum, LaAuO[sub 3], has been prepared from Au[sub 2]O[sub 3] [center dot] 2H[sub 2]O and La(OH)[sub 3] by applying high oxygen pressure and adding aqueous KOH (55%) as a mineralizer. The bright yellow and diamagnetic LaAuO[sub 3] crystallizes in the orthorhombic crystal system, Pbcm, a = 403.35(7), b = 1307.3(2), c = 569.52(8) pm. Z = 4. The crystal structure (determined from 980 unique reflections with a final R value of 5.7% (R[sub w] = 4.7%)) consists of a grid of cubes formed by the oxygens which are either centered by lanthanum ions or face centered by gold ions. Thus, lanthanum is coordinated eightfold, and gold fourfold, by oxygen. LaAuO[sub 3] may be described as a CaF[sub 2] structure sheared within the (110) plane by half a translational period along [0 0 1].
- OSTI ID:
- 7072699
- Journal Information:
- Journal of Solid State Chemistry; (United States), Vol. 105:2; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GOLD OXIDES
CRYSTAL STRUCTURE
LANTHANUM OXIDES
CHEMICAL PREPARATION
LATTICE PARAMETERS
ORTHORHOMBIC LATTICES
CHALCOGENIDES
CRYSTAL LATTICES
GOLD COMPOUNDS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies