Colossal Positive and Negative Thermal Expansion in the Framework Material Ag 3 [Co(CN) 6 ]
Rutherford Appleton Laboratory · Durham University · +2 more institutions
Abstract
We show that silver(I) hexacyanocobaltate(III), Ag3[Co(CN)6], exhibits positive and negative thermal expansion an order of magnitude greater than that seen in other crystalline materials. This framework material expands along one set of directions at a rate comparable to the most weakly bound solids known. By flexing like lattice fencing, the framework couples this to a contraction along a perpendicular direction. This gives negative thermal expansion that is 14 times larger than in ZrW2O8. Density functional theory calculations quantify both the low energy associated with this flexibility and the role of argentophilic (Ag+...Ag+) interactions. This study illustrates how the mechanical properties of a van der…
Citation impact
- FWCI
- 13.31
- Percentile
- 100%
- References
- 22
Authors
8- ALAndrew L. GoodwinCorresponding
Rutherford Appleton Laboratory, Durham University, University of Cambridge, University of Oxford
- MCM. Calleja
Rutherford Appleton Laboratory, Durham University, University of Cambridge, University of Oxford
- MJMichael J. Conterio
Rutherford Appleton Laboratory, Durham University, University of Cambridge, University of Oxford
- MTMartin T. Dove
Rutherford Appleton Laboratory, Durham University, University of Cambridge, University of Oxford
- JSJohn S. O. Evans
Rutherford Appleton Laboratory, Durham University, University of Cambridge, University of Oxford
Topics & keywords
- Negative thermal expansion
- Thermal expansion
- van der Waals force
- Thermal
- Density functional theory
- Lattice (music)
- Materials science
- Condensed matter physics
- Affordable and clean energy