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Hidden negative linear compressibility in lithium l-tartrate.

Hamish Hei-Man YeungRebecca KilmurrayClaire L HobdayScott C McKellarAnthony K CheethamDavid R AllanStephen A Moggach
Published in: Physical chemistry chemical physics : PCCP (2018)
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.
Keyphrases
  • crystal structure
  • high resolution
  • air pollution
  • small molecule
  • solid state
  • high throughput
  • computed tomography
  • magnetic resonance imaging
  • electron microscopy
  • neural network