AuNi3Si6 and Au2Ni4Si7: Two New Structure Types Related to the CaF2-Type Structure

Autor(en)

Matthias Stacher, Herta S. Effenberger, Herbert Ipser, Klaus W. Richter

Abstrakt

The two compounds AuNi

₃Si

₆ and Au

₂Ni

₄Si

₇ were prepared from the elements by arc melting and subsequent annealing at 500 °C. They were investigated by X-ray diffraction (powder and single-crystal methods) and by scanning-electron microscopy which was used for the independent determination of the phase compositions. Both compounds show only minor homogeneity ranges. Single-crystal XRD was used for structure determination. Both title compounds crystallize in new structure types; AuNi

₃Si

₆ (Pearson symbol hR30, space group R$\bar{3}$m) and Au

₂Ni

₄Si

₇ (Pearson symbol mC26, space group C2/m). The new crystal structures are related to that of NiSi

₂ (CaF

₂-type); AuNi

₃Si

₆ may be derived from this structure by a shear operation, while Au

₂Ni

₄Si

₇ may be regarded as intergrowth structure of the CaF

₂ and Hg

₂Pt-type.

Organisation(en)

Institut für Physikalische Chemie, Institut für Mineralogie und Kristallographie, Institut für Funktionelle Materialien und Katalyse, Zentrum für Röntgenstrukturanalyse

Journal

Zeitschrift für Anorganische und Allgemeine Chemie

Band

641

Seiten

1428-1434

Anzahl der Seiten

7

ISSN

0044-2313

DOI

https://doi.org/10.1002/zaac.201500109

Publikationsdatum

07-2015

Peer-reviewed

Ja

ÖFOS 2012

104003 Anorganische Chemie, 104017 Physikalische Chemie, 104011 Materialchemie, 105113 Kristallographie

Schlagwörter

ASJC Scopus Sachgebiete

Inorganic Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/auni3si6-and-au2ni4si7-two-new-structure-types-related-to-the-caf2type-structure(2308232a-ece7-4cee-8281-89c68ded0a8a).html