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

Goodwin, A. L. and Keen, D. A. and Tucker, M. G. (2008) Large negative linear compressibility of Ag3[Co(CN)6]. Proceedings of the National Academy of Sciences, 105 (48). pp. 18708-18713. ISSN Online ISSN 1091-6490 DOI

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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.

Item Type: Article
Uncontrolled Keywords: 08AREP IA57 2008 P
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Proceedings of the National Academy of Sciences
Volume: 105
Page Range: pp. 18708-18713
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:02
Last Modified: 23 Jul 2013 10:07

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