Change search
ReferencesLink to record
Permanent link

Direct link
Pressure-induced transformation in Na4C60 polymer: X-ray diffraction and Raman scattering experiments
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Show others and affiliations
2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 84, no 14, 144106- p.Article in journal (Refereed) Published
Abstract [en]

In this article the alkali metal-intercalated two-dimensional (2D) polymer Na4C60 is studied under pressure up to 41 GPa at room temperature by Raman spectroscopy and x-ray diffraction (XRD) measurements. Two transitions are identified in the studied pressure range. The first one is observed at ∼3 GPa by both diffraction and Raman scattering. A kink in the pressure slope of the cell parameters (especially along the c axis) shows the appearance of a less compressible phase. The decrease in the C60-C60 distance and the Na-C distance, combined with the frequency softening of the Raman modes, leads to a picture of higher electron hopping. The second transition occurs at around 15 GPa, where the distinct Raman peaks of 2D-Na4C60 disappear and become very broad and diffuse. New bands at 200–800 cm−1, 1590 cm−1, and ∼1800 cm−1, exhibit similar features to those of a reported 3D-C60 polymeric structure. The XRD data show that the cell parameters a, b, and c deviate from their early pressure evolution and become almost pressure independent, accompanied by the formation of amorphous material. Both the evolution of the Raman features of Na4C60 at pressures above 15 GPa and the Raman measurements of the samples on decompression indicate that most C60 molecules in the material are preserved after such a high pressure cycle. Our findings are discussed in terms of the formation of the first high-pressure intercalated C60 3D-polymer structure through the random creation of new polymeric bonds between fullerene molecules.

Place, publisher, year, edition, pages
American Physical Society , 2011. Vol. 84, no 14, 144106- p.
Keyword [en]
Fullerenes, fullerides, intercalation compounds, Na4C60, polymer, three-dimensional polymer, high pressure, Raman spectroscopy, X-ray diffraction, XRD, compressibility, phase transformation
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-48283DOI: 10.1103/PhysRevB.84.144106OAI: diva2:448090
Swedish Research Council, 621-2010-3732

Open access - Creative Commons license

Available from: 2011-10-20 Created: 2011-10-14 Last updated: 2015-09-28Bibliographically approved

Open Access in DiVA

fulltext(2891 kB)250 downloads
File information
File name FULLTEXT02.pdfFile size 2891 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Yao, MingguangSundqvist, BertilWågberg, Thomas
By organisation
Department of Physics
In the same journal
Physical Review B. Condensed Matter and Materials Physics
Condensed Matter Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 250 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 89 hits
ReferencesLink to record
Permanent link

Direct link