Synthesis and Crystal Structure Determination of LaAuO3

Martina Ralle, Martin Jansen

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

A new ternary oxide of gold and lanthanum, LaAuO3, has been prepared from Au2O3 · 2H2O and La(OH)3 by applying high oxygen pressure and adding aqueous KOH (55%) as a mineralizer. The bright yellow and diamagnetic LaAuO3 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% (Rw = 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. LaAuO3 may be described as a CaF2 structure sheared within the (110) plane by half a translational period along (0 0 1].

Original languageEnglish (US)
Pages (from-to)378-384
Number of pages7
JournalJournal of Solid State Chemistry
Volume105
Issue number2
DOIs
StatePublished - Aug 1993
Externally publishedYes

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Lanthanum
lanthanum
Gold
Crystal structure
gold
Oxygen
crystal structure
synthesis
Ions
high pressure oxygen
oxygen
Oxides
ions
grids
Crystals
oxides
crystals

ASJC Scopus subject areas

  • Materials Chemistry
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

Synthesis and Crystal Structure Determination of LaAuO3 . / Ralle, Martina; Jansen, Martin.

In: Journal of Solid State Chemistry, Vol. 105, No. 2, 08.1993, p. 378-384.

Research output: Contribution to journalArticle

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abstract = "A new ternary oxide of gold and lanthanum, LaAuO3, has been prepared from Au2O3 · 2H2O and La(OH)3 by applying high oxygen pressure and adding aqueous KOH (55{\%}) as a mineralizer. The bright yellow and diamagnetic LaAuO3 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{\%} (Rw = 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. LaAuO3 may be described as a CaF2 structure sheared within the (110) plane by half a translational period along (0 0 1].",
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AB - A new ternary oxide of gold and lanthanum, LaAuO3, has been prepared from Au2O3 · 2H2O and La(OH)3 by applying high oxygen pressure and adding aqueous KOH (55%) as a mineralizer. The bright yellow and diamagnetic LaAuO3 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% (Rw = 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. LaAuO3 may be described as a CaF2 structure sheared within the (110) plane by half a translational period along (0 0 1].

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