State Key Laboratory of Superhard Materials, College of Physics, Jilin University , Changchun 130012, China.
J Am Chem Soc. 2017 Nov 8;139(44):15648-15651. doi: 10.1021/jacs.7b10292. Epub 2017 Oct 26.
Materials with negative linear compressibility (NLC) counterintuitively expand along one specific direction coupled to the volume reduction when compressed uniformly. NLC with a large value is desired for compression and materials science. However, NLC is generally smaller than -20 TPa. High-pressure X-ray diffraction experiments reveal that the β-quartz-like InH(BDC) generates an extreme NLC (-62.4 TPa) by framework hinging. InH(BDC) is much safer and lower-cost than Au/Ag and CN-containing materials that dominated the fields of large NLC. This work reconfirms that a negative thermal expansion flexible framework could likely exhibit large NLC. Moreover, a large NLC could be anticipated to arise from β-quartz-like or related frameworks composed of rigid linear ligands and flexible framework angles.
具有负线性压缩率（NLC）的材料反直觉地沿一个特定方向膨胀，同时在均匀压缩时体积减小。在压缩和材料科学中，需要具有较大 NLC 值的材料。然而，NLC 通常小于-20 TPa。高压 X 射线衍射实验表明，β-石英类似的 InH(BDC) 通过框架铰链产生了极端的 NLC（-62.4 TPa）。InH(BDC) 比主导大 NLC 领域的 Au/Ag 和含 CN 材料安全且成本低得多。这项工作再次证实，具有负热膨胀的柔性框架可能表现出较大的 NLC。此外，可以预期，由刚性线性配体和柔性框架角组成的β-石英类似或相关框架会产生大的 NLC。
