Thermal Conductivity of Crystals and Liquids

概要

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Thermal conductivity of crystals without defects is calculated on the approximation that the mutual collisions of phonons of the normal type occur far more frequently than the Umklapp collisions. The conductivity K for crystals at temperatures not too low below the characteristic temperature and above is expressed as, [numerical formula] where q is the sound velocity, a the lattice constant. U/V the cohesive energy per unit volume. T the absolute temperature and Q is a number of the order of unity introduced to take into account of the difference of the crystal structure. This formula fits fairly well to observed values for ionic crystals having NaCl type lattice and furthermore applies equally to the conductivity of liquids. In the latter case it is shown that the above formula is approximately identical with the well known formula proposed by Bridgman.
社団法人日本物理学会の論文
1954-08-25