Darstellung und kristallstruktur des neuen lanthanaurates La4Au2O9

Martina Ralle; Martin Jansen

doi:10.1016/0925-8388(94)90707-2

Darstellung und kristallstruktur des neuen lanthanaurates La₄Au₂O₉

Martina Ralle, Martin Jansen

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Single crystals of La₄Au₂O₉ have been obtained by reacting Au₂O₃ × 2H₂O with La(OH)₃ applying elevated oxygen pressures and hydrothermal conditions (p(O₂)=70 MPa, T=873 K). The title compound is tending strongly to mimetic twinning (Pbcn; a=1212.16(4), b=631.99(2), c=1210.67(4) (pm); Z=4; 2024 unique reflections; R=0.027). Approximately square planar AuO₄ units are stacked to form a columnar arrangement; they are connected to each other three-dimensionally by LaO₇ polyhedra. One of the oxygen atoms is connected exclusively to lanthanum atoms. There are structural relations to Bi₂CuO₄.

Original language	German
Pages (from-to)	7-13
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	203
Issue number	C
DOIs	https://doi.org/10.1016/0925-8388(94)90707-2
State	Published - Jan 4 1994
Externally published	Yes

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/0925-8388(94)90707-2

Cite this

@article{1054e78bb1e44603a8982a34cfda3679,

title = "Darstellung und kristallstruktur des neuen lanthanaurates La4Au2O9",

abstract = "Single crystals of La4Au2O9 have been obtained by reacting Au2O3 × 2H2O with La(OH)3 applying elevated oxygen pressures and hydrothermal conditions (p(O2)=70 MPa, T=873 K). The title compound is tending strongly to mimetic twinning (Pbcn; a=1212.16(4), b=631.99(2), c=1210.67(4) (pm); Z=4; 2024 unique reflections; R=0.027). Approximately square planar AuO4 units are stacked to form a columnar arrangement; they are connected to each other three-dimensionally by LaO7 polyhedra. One of the oxygen atoms is connected exclusively to lanthanum atoms. There are structural relations to Bi2CuO4.",

author = "Martina Ralle and Martin Jansen",

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doi = "10.1016/0925-8388(94)90707-2",

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journal = "Journal of Alloys and Compounds",

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T1 - Darstellung und kristallstruktur des neuen lanthanaurates La4Au2O9

AU - Ralle, Martina

AU - Jansen, Martin

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N2 - Single crystals of La4Au2O9 have been obtained by reacting Au2O3 × 2H2O with La(OH)3 applying elevated oxygen pressures and hydrothermal conditions (p(O2)=70 MPa, T=873 K). The title compound is tending strongly to mimetic twinning (Pbcn; a=1212.16(4), b=631.99(2), c=1210.67(4) (pm); Z=4; 2024 unique reflections; R=0.027). Approximately square planar AuO4 units are stacked to form a columnar arrangement; they are connected to each other three-dimensionally by LaO7 polyhedra. One of the oxygen atoms is connected exclusively to lanthanum atoms. There are structural relations to Bi2CuO4.

AB - Single crystals of La4Au2O9 have been obtained by reacting Au2O3 × 2H2O with La(OH)3 applying elevated oxygen pressures and hydrothermal conditions (p(O2)=70 MPa, T=873 K). The title compound is tending strongly to mimetic twinning (Pbcn; a=1212.16(4), b=631.99(2), c=1210.67(4) (pm); Z=4; 2024 unique reflections; R=0.027). Approximately square planar AuO4 units are stacked to form a columnar arrangement; they are connected to each other three-dimensionally by LaO7 polyhedra. One of the oxygen atoms is connected exclusively to lanthanum atoms. There are structural relations to Bi2CuO4.

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