Negative linear compressibility and massive anisotropic thermal expansion in methanol monohydrate
Fortes, Andrew Dominic and Suard, E. and Knight, K.S. (2011) Negative linear compressibility and massive anisotropic thermal expansion in methanol monohydrate. Science 331 (6018), pp. 742-746. ISSN 0036-8075.
The vast majority of materials shrink in all directions when hydrostatically compressed; exceptions include certain metallic or polymer foam structures, which may exhibit negative linear compressibility (NLC) (that is, they expand in one or more directions under hydrostatic compression). Materials that exhibit this property at the molecular level-crystalline solids with intrinsic NLC-are extremely uncommon. With the use of neutron powder diffraction, we have discovered and characterized both NLC and extremely anisotropic thermal expansion, including negative thermal expansion (NTE) along the NLC axis, in a simple molecular crystal (the deuterated 1:1 compound of methanol and water). Apically linked rhombuses, which are formed by the bridging of hydroxyl-water chains with methyl groups, extend along the axis of NLC/NTE and lead to the observed behavior.
|School:||Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences > UCL/Birkbeck Centre for Planetary Sciences|
|Date Deposited:||23 Jun 2011 09:46|
|Last Modified:||06 Jun 2013 15:33|
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