Anomalous thermal expansion in the square-net compounds RE 4 T Ge8 (RE = Yb, Gd; T = Cr-Ni, Ag)

Sebastian C. Peter, Maria Chondroudi, Christos D. Malliakas, Mahalingam Balasubramanian, Mercouri G. Kanatzidis

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30 Citations (Scopus)

Abstract

The family of materials RE4TGe8 (RE = Yb, Gd; T = transition metal) exhibits directional zero thermal expansion (ZTE) via a process that is associated with the linking of planar square nets in the third dimension. The Ge square nets in these compounds exhibit commensurate long-range modulations similar to those observed in charge-density-wave compounds. The ZTE is manifested in the plane of the square nets from 10 to 300 K with negligible volume expansion below ∼160 K. The specific atomic arrangement in RE 4TGe8 enables a Poisson-like mechanism that allows the structure to contract along one direction as it expands only slightly in the perpendicular direction.

Original languageEnglish
Pages (from-to)13840-13843
Number of pages4
JournalJournal of the American Chemical Society
Volume133
Issue number35
DOIs
Publication statusPublished - Sep 7 2011

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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