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 Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


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 (US)
Pages (from-to)13840-13843
Number of pages4
JournalJournal of the American Chemical Society
Issue number35
StatePublished - Sep 7 2011

ASJC Scopus subject areas

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


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