Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 142, Issue 16, Pages 7584-7590Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c01703
Keywords
-
Categories
Funding
- National Key R&D Program of China [2018YFA0305900]
- National Natural Science Foundation of China [51822204, 11634004, 11804384]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1132]
- Program for JLU Science and Technology Innovative Research Team [2017TD-01]
- Graduate Interdisciplinary Research Fund of Jilin University [10183201833]
Ask authors/readers for more resources
According to the laws of thermodynamics, materials normally exhibit contraction or expansion along the directions of the applied pressure or tension. Here, we show that a man-made cocrystal of a metallofullerene and highly energetic cubane, with strained sp(3) bonding, may exhibit an anomalous negative volume compressibility. In this cocrystal, the freely rotating fullerene Sc3N@C-80 acts as a structural building block while static cubane molecules fill the lattice interstitial sites. Under high pressure, Sc3N@C-80 keeps stable and preserves the crystalline framework of the materials, while the cubane undergoes a progressive configurational transformation above 6.5 GPa, probably promoted by charge transfer from fullerene to cubane. A further configurational change of the cubane into a low-density configuration at higher pressure results in an anomalous pressure-driven lattice expansion of the cocrystal (similar to 1.8% volume expansion). Such unusual negative compressibility has previously only been predicted by theory and suggested to appear in mechanical metamaterials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available