Large negative linear compressibility of Ag3[Co(CN)6]

Andrew L. Goodwin, David A. Keen, Matthew G. Tucker

Research output: Contribution to journalArticlepeer-review

226 Scopus citations

Abstract

Silver(I) hexacyanocobaltate(III), Ag3[Co(CN)6], shows a large negative linear compressibility (NLC, linear expansion under hydrostatic pressure) at ambient temperature at all pressures up to our experimental limit of 7.65(2) GPa. This behavior is qualitatively unaffected by a transition at 0.19 GPa to a new phase Ag3[Co(CN)6]-II, whose structure is reported here. The high-pressure phase also shows anisotropic thermal expansion with large uniaxial negative thermal expansion (NTE, expansion on cooling). In both phases, the NLC/NTE effect arises as the rapid compression/contraction of layers of silver atoms - weakly bound via argentophilic interactions - is translated via flexing of the covalent network lattice into an expansion along a perpendicular direction. It is proposed that framework materials that contract along a specific direction on heating while expanding macroscopically will, in general, also expand along the same direction under hydrostatic pressure while contracting macroscopically.

Original languageEnglish
Pages (from-to)18708-18713
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume105
Issue number48
DOIs
StatePublished - Dec 2 2008
Externally publishedYes

Keywords

  • Flexibility
  • Framework materials
  • High-pressure
  • Negative linear compression
  • Negative thermal expansion

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