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Issue 5, 2017
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Hidden negative linear compressibility in lithium L-tartrate

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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.

Graphical abstract: Hidden negative linear compressibility in lithium l-tartrate

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The article was received on 20 Dec 2016, accepted on 06 Jan 2017 and first published on 06 Jan 2017

Article type: Paper
DOI: 10.1039/C6CP08690J
Citation: Phys. Chem. Chem. Phys., 2017,19, 3544-3549
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    Hidden negative linear compressibility in lithium L-tartrate

    H. H.-M. Yeung, R. Kilmurray, C. L. Hobday, S. C. McKellar, A. K. Cheetham, D. R. Allan and S. A. Moggach, Phys. Chem. Chem. Phys., 2017, 19, 3544
    DOI: 10.1039/C6CP08690J

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