Hidden negative linear compressibility in lithium L-tartrate†

Hamish H.-m. Yeung, Rebecca Kilmurray, Claire L. Hobday, Scott C. Mckellar, Anthony K. Cheetham, David R. Allan, Stephen A. Moggach

Research output: Contribution to journalArticlepeer-review

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 TPa1
,
and an overall NLC capacity, wNLC = 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.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Early online date6 Jan 2017
DOIs
Publication statusE-pub ahead of print - 6 Jan 2017

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