Hidden negative linear compressibility in lithium l-tartrate

Literature Information

Publication Date 2017-01-06
DOI 10.1039/C6CP08690J
Impact Factor 3.676
Authors

Claire L. Hobday, Scott C. McKellar, Anthony K. Cheetham, David R. Allan, Stephen A. Moggach


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Abstract

By decoupling the mechanical behaviour of building units for the first time in a wine-rack framework containing two different strut types, we show that lithium L-tartrate exhibits NLC with a maximum value, Kmax = −21 TPa−1, and an overall NLC capacity, χNLC = 5.1%, that are comparable to the most exceptional materials to date. Furthermore, the contributions from molecular strut compression and angle opening interplay to give rise to so-called “hidden” negative linear compressibility, in which NLC is absent at ambient pressure, switched on at 2 GPa and sustained up to the limit of our experiment, 5.5 GPa. Analysis of the changes in crystal structure using variable-pressure synchrotron X-ray diffraction reveals new chemical and geometrical design rules to assist the discovery of other materials with exciting hidden anomalous mechanical properties.

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Physical Chemistry Chemical Physics
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