Mixed valency in Yb7Co4InGe12: A novel intermetallic compound stabilized in liquid indium

Maria Chondroudi, Mahalingam Balasubramanian, Ulrich Welp, Wai K. Kwok, Mercouri G. Kanatzidis

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The quaternary compounds RE7Co4InGd12 (RE = Dy, Ho, Yb) were obtained from In flux reactions as thin silver needles. RE7Co4InGe12 crystallizes in the tetragonal P4/m space group under a new structure type which is characterized by columnar units forming three different types of channels with the RE atoms situated within these channels. Investigation of the Yb analog with magnetic susceptibility measurements, X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge spectroscopy (XANES) revealed that Yb7Co 4InGe12 is a mixed-valence compound and that the relative Yb3+/Yb2+ ratio is slightly temperature-dependent. Additionally, resistivity measurements for Yb7Co4InGe 12 exhibited negative magnetoresistance at low temperatures.

Original languageEnglish
Pages (from-to)4769-4775
Number of pages7
JournalChemistry of Materials
Volume19
Issue number19
DOIs
Publication statusPublished - Sep 18 2007

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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