WFRF:(Mezouar Mohamed)
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- Yao, Mingguang (author)
Pressure-induced transformation in Na4C60 polymer: X-ray diffraction and Raman scattering experiments
- Article/chapterEnglish2011
Publisher, publication year, extent ...
- American Physical Society,2011
- electronicrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:umu-48283
- https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-48283URI
- https://doi.org/10.1103/PhysRevB.84.144106DOI
Supplementary language notes
- Language:English
- Summary in:English
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- SwePubSwePub
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Notes
- Open access - Creative Commons license
- 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.
Subject headings and genre
- NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
- NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
- Fullerenes
- fullerides
- intercalation compounds
- Na4C60
- polymer
- three-dimensional polymer
- high pressure
- Raman spectroscopy
- X-ray diffraction
- XRD
- compressibility
- phase transformation
- Condensed matter physics
- Kondenserade materiens fysik
- fysik
- Physics
Added entries (persons, corporate bodies, meetings, titles ...)
- Pischedda, Vittoria (author)
- Sundqvist, BertilUmeå universitet,Institutionen för fysik(Swepub:umu)besu0001 (author)
- Wågberg, ThomasUmeå universitet,Institutionen för fysik(Swepub:umu)thwa0002 (author)
- Mezouar, Mohamed (author)
- Debord, Régis (author)
- San Miguel, Alfonso (author)
- Umeå universitetInstitutionen för fysik (creator_code:org_t)
Related titles
- In:Physical Review B. Condensed Matter and Materials Physics: American Physical Society84:14, s. 144106-1098-01211550-235X
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