Hidden negative linear compressibility in lithiuml-tartrate

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, K = -21 TPa, and an overall NLC capacity, χ = 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.

A Comparison of Negative Compressibility between 3D Cellular Models Constructed by 2D Hinging Wine‐Rack and Hexagonal Honeycomb Mechanisms

“…Unlike traditional materials that contract unanimously in external uniform pressure, a limited number of materials [1][2][3][4][5][6][7][8][9][10][11][12] have been found to elongate at least in one direction, which are defined as negative compressive materials. [13] The behavior of relative reduction of length in one direction is named negative linear compressibility (NLC) and equally in two or three directions it is known as negative area compressibility (NAC) and negative volume compressibility (NVC).…”

“…Although negative compressive materials are rare in the copious myriad of available materials, considerable progress has been made in this area, ranging from potassium beryllium fluoroborate, [3] silver(I) tricyanomethanide, [4] lithium L-tartrate, [5] carbon allotropes, [6] few-layer graphene to hexagonal boron nitride and molybdenum disulfide, [7] lanthanoid hexacyanoferrate frameworks, [8] and metal-organic-framework InH(BDC) 2 (BDC ¼ 1,4-benzenedicarboxylate). [9] Alternatively, some researchers also use the destabilization of metastable or stable equilibrium to attain negative compressibility of metamaterials [10][11][12] by applying a finite force.…”

Anomalous Lattice Dynamics in AgC4N3: Insights From Inelastic Neutron Scattering and Density Functional Calculations

“…In recent years, a few crystalline materials are found to exhibit expansion along certain crystallographic axes on application of static pressure (Goodwin et al, 2008a ; Cairns et al, 2012 , 2013 ; Cairns and Goodwin, 2015 ; Gupta et al, 2017 ; Yeung et al, 2017 ). This type of abnormal behavior is known as negative linear or area compressibility (NLC or NAC).…”

Negative Linear Compressibility Response to Pressure in Multitype Wine-Rack Metal–Organic Frameworks

“…15 As an extension, the NLC effect of lithium L-tartrate demonstrates that a wine-rack with two different strut types can also tolerantly lead to the NLC behavior. 14 However, the previous NLC research concentrated solely on the systems consisting of homogeneous wine-rack motif although with different wine-rack strut types in the case of lithium L-tartrate. 14 No single materials with multitype wineracks have ever been studied on which the effect of high pressure is unclear up to now.…”

“…14 However, the previous NLC research concentrated solely on the systems consisting of homogeneous wine-rack motif although with different wine-rack strut types in the case of lithium L-tartrate. 14 No single materials with multitype wineracks have ever been studied on which the effect of high pressure is unclear up to now. Can a single material with multitype wine-racks in its topology structure exhibit NLC behavior?…”