Abstract
We have measured the specific heat of Allen-Bradley glassy carbon (heat-treated at 2500‡C) in the temperature range 1.2 ≤ T ≤ 20 K. The material was further characterized by x-ray, dc electrical conductivity, magneto-resistance, and Hall effect measurements. The specific heat results are compared to those for natural graphite and other disordered carbons. Below T = 2.2 K the glassy carbon data can be represented by the equation C p = (0.054 mJ/mole-K 2 )T + (0.101 mJ/mole-K 4 )T 3 .The lattice specific heat was found to be larger than that of natural graphite at all temperatures between 1 and 20 K. We attribute this enhancement primarily to a much reduced value of C 33 ,the elastic constant characterizing compressive displacements between graphite-like planes.
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