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  • 1. Arvanitidis, J.
    et al.
    Meletov, K. P.
    Kourouklis, G. A.
    Papagelis, K.
    Soldatov, Alexander
    Prassides, K.
    Ves, S.
    High pressure study of the 2D polymeric phase of C60 by means of Raman spectroscopy2001Inngår i: High Pressure Research, ISSN 0895-7959, E-ISSN 1477-2299, Vol. 18, nr 1-6, s. 145-151Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effect of high hydrostatic pressure, up to 12GPa, on the intramolecular phonon frequencies and the material stability of the two-dimensional tetragonal Cm polymer has been studied by means of Raman spectroscopy in the spectral range of the radial intramolecular modes (200-800cm-1). A number of new Raman modes appear in the spectrum for pressures ≈ 1.4 and ≈ 5.0 GPa. The pressure coefficients for the majority of the phonon modes exhibit changes to lower values at P=4.0 GPa, which may be related to a structural modification of the 2D polymer to a more isotropic phase. The peculiarities observed in the Raman spectra are reversible and the material is stable in the pressure region investigated.

  • 2.
    Berg, Sven
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Jonsén, Pär
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Häggblad, Hans-Åke
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Carlson, Johan E.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    High pressure characterization and modelling of CaCO3 powder mix in the Bridgman anvil apparatus2012Inngår i: High Pressure Research, ISSN 0895-7959, E-ISSN 1477-2299, Vol. 32, nr 4, s. 490-508Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    For investigating high pressure sintering processes, numerical models can be used. This will demand material models which give realistic mechanical response throughout the whole parameter space of the actual process. As the pressures become higher, the material density approaches its full theoretical value and the elastic part of the material properties becomes increasingly important. In this investigation, Poisson's ratio was determined using ultrasonic pulse-echo measurements. A new elastic model and an improved plasticity model were implemented into a user-defined material subroutine in a finite element (FE) code. To experimentally investigate the load displacement response and pressure distribution in powder compacts during pressing, a pressure instrumented Bridgman anvil apparatus was used. Validation of the FE model was conducted against experimental data from pressing experiments using two different start densities. The results show that the simulation model is indeed capable of reproducing load–thickness curves and pressure profiles reasonable close to the experimental curves.

  • 3. Wågberg, T.
    et al.
    Nyeanchi, E. B.
    Soldatov, Alexander
    Sundqvist, B.
    2D polymerization and doping of fullerenes under pressure2000Inngår i: High Pressure Research, ISSN 0895-7959, E-ISSN 1477-2299, Vol. 18, nr 1-6, s. 139-143Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Tetragonal polymeric C60 has been studied by Raman spectroscopy and other methods. Attempts have been made to transform samples from the tetragonal to the orthorhom-bic phase and vice versa. The results suggest that the transformation is direct with no intermediate stage with free molecules. Tetragonal C60 has also been intercalated by potassium metal

  • 4. You, Shujie
    et al.
    Mases, Mattias
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Dobryden, Illia
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Green, Alexander A.
    Department of Materials Science and Engineering, Northwestern University, Evanston, IL.
    Hersam, Mark C.
    Department of Materials Science and Engineering, Northwestern University, Evanston, IL.
    Soldatov, Alexander
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Probing structural stability of double-walled carbon nanotubes at high non-hydrostatic pressure by Raman spectroscopy2011Inngår i: High Pressure Research, ISSN 0895-7959, E-ISSN 1477-2299, Vol. 31, nr 1, s. 186-190Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Theoretical calculations predict that the collapse pressure for double-walled carbon nanotubes (DWCNTs) is proportional to 1/R3, where R is the effective or average radius of a DWCNT. In order to address the problem of CNT stability at high pressure and stress, we performed a resonance Raman study of DWCNTs dispersed in sodium cholate using 532 and 633 nm laser excitation. Raman spectra of the recovered samples show minor versus irreversible changes with increasing ID/IG ratio after exposure to high non-hydrostatic pressure of 23 and 35 GPa, respectively. The system exhibits nearly 70% pressure hysteresis in radial breathing vibrational mode signals recovery on pressure release which is twice that predicted by theory.

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