抄録
Attractive forces between graphite masses separated by 100Å are calculated to be 4.76×104 dyne/cm2 by making use of Lifshitz’ formula for interaction forces between macroscopic neutral bodies. The two semi-infinite blocks are supposed to be put side by side with plane-parallel boundaries (perpendicular to the c-axis). For dielectric constants needed, results by Taft and Philipp evaluated from reflectance data are used. A contribution due to π-electron to the force is about 67%. The total force is compared with that evaluated from an interlayer potential function of graphite given semiempirically by Crowell under assumptions of pairwise additivity. The latter is 4.4 times as large as the former. An origin of this discrepancy may be attributed mainly to a shielding effect due to the basal planes, which reduces the force, obtained without regard to the effect, to one third.
