Negative compressibility in a molecular wine rack

Just as we expect materials to expand on increasing temperature, so too is it our intuition that materials should shrink under pressure. The opposite effect — expansion when pressure is applied — is termed negative linear compressibility (NLC) and has only recently been observed experimentally to any significant extent. The material in question, Ag3[Co(CN)6], behaves much like a collapsible wine-rack in that its volume reduces by actually expanding strongly in one direction. But despite having magnitude, NLC in Ag3[Co(CN)6] does not have range: the framework collapses to a new phase at just 0.19 GPa. So what can be done, and does it even matter? By including well ordered stacks of monovalen

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Andrew Cairns | Department of Materials, Imperial College London
a.cairns [at] imperial.ac.uk | +44 (0)20 7594 9528