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The thermal and electrical conductivites of an alloy of 80% Cu and 20% Ni with average crystal grain size 0 011 mm have been measured at liquid hydrogen and liquid helium temperatures A comparison of the results with Makinson's theory suggests that the thermal conductivity between 2° K and 20° K is the sum of a temperature proportional term due to electron transport with impurity scattering and a T 2 proportional term due to lattice wave transport with electron scattering, both terms being of the same order of magnitude
J. K. Hülm (1951) studied this question.