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Ca3Ag1+xGe3-x (x=1/3): New Transition Metal Zintl Phase with Intergrowth Structure and Alloying with Aluminum Metal

Författare

Summary, in English

The ternary Zintl phase Ca3Ag1+xGe3x (x = 1/3) was synthesized by the high-temperature solid-state technique and its crystal structure was refined from single-crystal diffraction data. The compound Ca3Ag1.32Ge2.68(1) adopts the Sc3NiSi3 type structure, crystal data: space group C2/m, a = 10.813(1) angstrom, b = 4.5346(4) angstrom, c = 14.3391(7) angstrom, beta = 110.05(1)degrees and V = 660.48(10) angstrom 3 for Z = 4. Its structure can be interpreted as an intergrowth of fragments cut from the CaGe (CrB-type) and the CaAg1+xGe1x (TiNiSi-type) structures, and it therefore represents an alkaline-earth member of the structure series with the general formula R2+nT2X2+n with n = 4. Unlike the rare-earth homologues that are fully ordered phases, one seventh of the atomic sites in the unit cell of the title compound are mixed occupied (roughly 2/3Ge and 1/3Ag), and this can be explained by the Zintl concept. The alloying of this phase using aluminum metal yielded the isotypic solid solution Ca3(Ag/Al)1+xGe3x, in which the aluminum for silver substitution is strictly localized in the TiNiSi substructure, revealing the very different functionality of the two building blocks.

Publiceringsår

2013

Språk

Engelska

Sidor

35-40

Publikation/Tidskrift/Serie

Zeitschrift für Anorganische und Allgemeine Chemie

Volym

639

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Chemical Sciences

Nyckelord

  • Intergrowth structure
  • Zintl phases
  • Silver
  • Germanide

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0044-2313