Abstract
The enthalpy of formation of single-wall carbon nanotubes (SWCNTs) and multiwall carbon nanotubes (MWCNTs) of different geometric sizes is evaluated. The region of phase stability of carbon nanotubes (CNTs) of different geometric shapes (with various lengths, inner radii, and numbers of carbon layers) is determined based on the approximate equation of state of nanocarbon. The estimates do not contradict the experimentally measured parameters of phase transformation of MWCNTs into nanodiamonds. The calculated melting point of nanotubes turned out to be higher than that of graphite. The region of phase stability of CNTs may turn out to be wider than the region of thermodynamic stability of graphite.
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