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Negative Volume Com...
Negative Volume Compressibility in Sc3N@C-80-Cubane Cocrystal with Charge Transfer
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Zhang, Ying (author)
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Yao, Mingguang (author)
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Du, Mingrun (author)
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Yao, Zhen (author)
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Wang, Yan (author)
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Dong, Jiajun (author)
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Yang, Zhenxing (author)
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- Sundqvist, Bertil (author)
- Umeå universitet,Institutionen för fysik
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Kovats, Eva (author)
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Pekker, Sandor (author)
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Liu, Bingbing (author)
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(creator_code:org_t)
- 2020-04-06
- 2020
- English.
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In: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 0002-7863 .- 1520-5126. ; 142:16, s. 7584-7590
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Zhang, Ying
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Yao, Mingguang
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Du, Mingrun
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Yao, Zhen
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Wang, Yan
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Dong, Jiajun
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show more...
-
Yang, Zhenxing
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Sundqvist, Berti ...
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Kovats, Eva
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Pekker, Sandor
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Liu, Bingbing
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Journal of the A ...
- By the university
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Umeå University