Electrical and thermal properties of new pyrographite films based on a condensation polymer, polyoxadiazole

Magnetoresistance, Hall coefficient, and thermal diffusivity of new high‐quality graphite films prepared by pyrolysis of a condensation polymer, poly( p‐phenylene‐1,3,4‐oxadiazole) were measured. The total carrier density, mobility, and thermal conductivity were 1.6×1019 cm−3, 7400 cm2 V−1 s−1, and 11 W cm−1 K−1 for the graphite film annealed at 3000 °C, which are almost comparable to those of highest quality graphites known so far. Drastic changes in the electronic and thermal properties with the heat‐treatment temperature were found and discussed in relation to the development of the high‐quality graphite.