Abstract
Drift-diffusion contributions to the thermoelectric power and Nernst–Ettingshausen effect have been calculated for graphite, using simplified models for the dispersion relationship ε(k) and carrier relaxation time τ(ε). A comparison of the results with those derived from experiment on single-crystal and highly oriented pyrolytic graphite allows phonon-drag contributions to be estimated. The calculations suggest that differences in the temperature dependence of the thermoelectric power for these types of graphite are due to differences in scattering mechanisms at low temperature. Several experiments are suggested to check the predictions of the models.