VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Low-energy vibrational excitatins of ▫$Mo_6_S_3I_6$▫ nanowires revealed by low-temperature specific heat
    Lasjaunias, J. C. ...
    We report on measurements of the low-temperature heat capacity of Mo6S3I6 nanowire-network samples in the form of a pressed pellet under different conditions of annealing. In the temperature (T) ... range of liquid He4 and below, specific heat is dominated by three contributions: (i) phonons, for T >2 K, (ii) a nuclear hyperfine contribution, below 0.3 K, and (iii) a series of Schottky anomalies for 2 K > T > 0.1 K. In pristine samples, the phonon contribution varies as T 2.6, which indicates a strongly anisotropic atomic structure. In the sample annealed at 800 .C, this term varies as T 2.3, in agreement with a more one-dimensional (1D) structure, consistent with the transport properties. In comparison to other quasi-1D compounds, the departurefrom the 3D limit (corresponding to the usual T 3 Debye law) is here very large, indicating a considerably loose interchain connection. We discuss the influence of stoichiometric disorder, especially the role of the position of the iodine atoms in the structure in both kinds of samples, the impact of topological imperfections and the possible origin of the observed Schottky anomalies.
    Vir: Nanotechnology. - ISSN 0957-4484 (Vol. 18, iss. 35, 5. sep. 2007, str. 355704-1-355704-7)
    Vrsta gradiva - članek, sestavni del
    Leto - 2007
    Jezik - angleški
    COBISS.SI-ID - 20938791

    Povezava(-e):

    http://iopscience.iop.org/0957-4484/18/35/355704/pdf/0957-4484_18_35_355704.pdf
    DOI

vir: Nanotechnology. - ISSN 0957-4484 (Vol. 18, iss. 35, 5. sep. 2007, str. 355704-1-355704-7)
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