Electrical Conduction in C-Direction of Highly Crystalline Graphites in Relation to Structural Perfection

概要

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Electrical resistivity in c-direction (p.) as a ftmction of temperature (7') has beeninvestigated of a number of highly crystalline specimens of kish and pyrolyticgraphites in relation to their structural perfectio?a evaluated by the basal-planeresistivity ratio between 300lC and 4.2 K (7?.=7>.(300)/p.(4.2)). The p. vs 7?.plot indicates a .4-shaped curve, and the p. vs T relationship becomes graduallymetallic-like as 7?7 increases. For pyrolytic graphite, the thinner the specimenthe higher the perfection in the range 0.016 to 0.73 mm. Based on these observa-tions, the intrinsic c-axis conduction is concluded to be described within theframework of band theory, while it is impeded by Iaminar defects and short-circuited sometimes by misaligned basal-planes especially in the pyrolyticspecimens. Comparison is made with the theory of Ono who has taken intoaccount the scattering of carriers by stacking faults.
社団法人日本物理学会の論文
1979-02-15