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Novel Superhard sp3 Carbon Allotrope from Cold-Compressed C70 Peapods
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2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 118, no 24, 245701Article in journal (Refereed) Published
Abstract [en]

Design and synthesis of new carbon allotropes have always been important topics in condensed matter physics and materials science. Here we report a new carbon allotrope, formed from cold-compressed C70 peapods, which most likely can be identified with a fully sp3-bonded monoclinic structure, here named V carbon, predicted from our simulation. The simulated x-ray diffraction pattern, near K-edge spectroscopy, and phonon spectrum agree well with our experimental data. Theoretical calculations reveal that V carbon has a Vickers hardness of 90 GPa and a bulk modulus ∼400  GPa, which well explains the "ring crack" left on the diamond anvils by the transformed phase in our experiments. The V carbon is thermodynamically stable over a wide pressure range up to 100 GPa, suggesting that once V carbon forms, it is stable and can be recovered to ambient conditions. A transition pathway from peapod to V carbon has also been suggested. These findings suggest a new strategy for creating new sp3-hybridized carbon structures by using fullerene@nanotubes carbon precursor containing odd-numbered rings in the structures.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 118, no 24, 245701
Keyword [en]
Carbon, Nanotubes, fullerenes, high pressure, superhard material, carbon allotropes, sp3 bonding, X-ray diffraction, hardness, compressibility
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-136919DOI: 10.1103/PhysRevLett.118.245701ISI: 000403341900005OAI: oai:DiVA.org:umu-136919DiVA: diva2:1114826
Available from: 2017-06-26 Created: 2017-06-26 Last updated: 2017-07-06Bibliographically approved

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Sundqvist, Bertil
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