Abstract
The increase in the low-temperature specific heat upon boronation of natural Madagascar flake graphite has been measured. For the pure material below 1.2\ifmmode^\circ\else\textdegree\fi{}K, $C=13.8T+27.7{T}^{3}$ \ensuremath{\mu}J/mole deg; for the same graphite boronated to 0.23 at.%, $C=34.5T+29.3{T}^{3}$ \ensuremath{\mu}J/mole deg. The change in electronic density of states at the Fermi surface is found to agree well with theoretical expectation. These results allow one to predict the Fermi-level shifts that would be necessary to account for the increased linear specific heat of disordered graphites. However, the Fermi-level shifts so predicted would require much larger changes in other electronic properties than are actually observed. Thus, the excess specific heats cannot be explained as being due to Fermi-level shifts.
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