RE2MAl6Si4 (RE = Gd, Tb, Dy; M = Au, Pt): Layered Quaternary Intermetallics Featuring CaAl2Si2-Type and YNiAl4Ge2-Type Slabs Grown from Aluminum Flux

Susan E. Latturner, Daniel Bilc, S. D. Mahanti, Mercouri G. Kanatzidis

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Six new intermetallic aluminum silicides-Gd2PtAl 6Si4, Gd2AuAl6Si4, Tb2PtAl6Si4, Tb2AuAl 6Si4, Dy2PtAl6Si4, and Dy2AuAl6Si4-have been obtained from reactions carried out in aluminum flux. The structure of these compounds was determined by single-crystal X-ray diffraction. They form in space group R3̄m with cell constants of a = 4.1623(3) Å and c = 51.048(5) Å for the Gd2PtAl6Si4 compound. The crystal structure is comprised of hexagonal nets of rare earth atoms alternating with two kinds of layers that have been observed in other multinary aluminide intermetallic compounds (CaAl2Si2 and YNiAl4Ge2). All six RE2MAl6Si4 compounds show antiferromagnetic transitions at low temperatures (TN < 20 K); magnetization studies of the Dy compounds show metamagnetic behavior with reorientation of spins at 6000 G. Band structure calculations indicate that the AlSi puckered hexagonal sheets in this structure are electronically distinct from the other surrounding structural motifs.

Original languageEnglish
Pages (from-to)7959-7966
Number of pages8
JournalInorganic Chemistry
Volume42
Issue number24
DOIs
Publication statusPublished - Dec 1 2003

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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