Valence Instabilities, Phase Transitions, and Abrupt Lattice Expansion at 5 K in the YbGaGe System

Serena Margadonna, Kosmas Prassides, Andrew N. Fitch, James R. Salvador, Mercouri G. Kanatzidis

研究成果: Article査読

22 被引用数 (Scopus)

抄録

The powder synchrotron X-ray diffraction technique was used to study the thermal expansion behavior of the mixed valence layered compound, YbGa1.05Ge0.95 in the temperature range 3?1123 K. A surprising abrupt isosymmetric phase transition, accompanied by a dramatic volume increase (negative thermal expansion), was found at 5 K induced by a sudden Yb valence transition from +(2 + ε) toward +2. At high temperatures, the material undergoes a transformation to a highly disordered structure until it eventually collapses at 1123 K to a structure with isovalent Yb ions and flat Ga/Ge planes (AlB2 type).

本文言語English
ページ(範囲)4498-4499
ページ数2
ジャーナルJournal of the American Chemical Society
126
14
DOI
出版ステータスPublished - 2004 4 14

ASJC Scopus subject areas

  • 触媒
  • 化学 (全般)
  • 生化学
  • コロイド化学および表面化学

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