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The thermal properties of (KBr)l "(KCN)"single crystals have been studied between 0.05 and 100 K over the entire compositional range. For 0.25 & x & 0.70, these crystals have the thermal conductivity that is typical for all structurally disordered, amorphous solids. The same holds for the low-temperature specific heat, which varies linearly with temperature, and logarithmically with the measuring time. Through a quantitative analysis it is shown that these mixed crystals represent an excellent example of two-level-system excitations of variable number densities, depending on the choice of x. Therefore, these crystals can serve as a model for the exploration of the low-energy excitations which are characteristic for all amorphous solids.

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