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Hidden negative linear compressibility in lithium l-tartrate

DOI: 10.1039/C6CP08690J DOI Help

Authors: Hamish H.-m. Yeung (Universoty of Oxford) , Rebecca Kilmurray (University of Edinburgh; Imperial College London) , Claire Hobday (University of Edinburgh) , Scott C. Mckellar (University of Edinburgh) , Anthony K. Cheetham (University of Cambridge) , David R. Allan (Diamond Light Source) , Stephen A. Moggach (The University of Edinburgh)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Phys. Chem. Chem. Phys.

State: Published (Approved)
Published: January 2017
Diamond Proposal Number(s): 9700

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.

Subject Areas: Materials, Physics

Instruments: I19-Small Molecule Single Crystal Diffraction