Measures thermal conductivity limits in disordered solids, suggesting similarities to amorphous materials.
Measurements of the thermal conductivity above 30 K of mixed crystals with controlled disorder, (KBr)_1-x(KCN)ₓ, (NaCl)_1-x, (NaCn)ₓ Zr_1-x{Y}ₓO_2-x/2, and Ba_1-x{La}ₓF₂₊ₓ, support the idea of a lower limit to the thermal conductivity of disordered solids. In each case, as x is increased, the data approach the calculated minimum conductivity based on a model originally due to Einstein. These measurements support the claim that the lattice vibrations of these disordered crystals are essentially the same as those of an amorphous solid.
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Cahill et al. (1992) studied this question.
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