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We report a comparative study of the specific heat, electrical resistivityand thermal conductivity of the quasi-two-dimensional purple bronzesNa$_{0.9}$Mo$_6$O$_{17}$ and K$_{0.9}$Mo$_6$O$_{17}$, with special emphasis onthe behavior near their respective charge-density-wave transition temperatures$T_P$. The contrasting behavior of both the transport and the thermodynamicproperties near $T_P$ is argued to arise predominantly from the differentlevels of intrinsic disorder in the two systems. A significant proportion ofthe enhancement of the thermal conductivity above $T_P$ inNa$_{0.9}$Mo$_6$O$_{17}$, and to a lesser extent in K$_{0.9}$Mo$_6$O$_{17}$, isattributed to the emergence of phason excitations.

On the transport and thermodynamic properties of quasi-two-dimensional purple bronzes A$_{0.9}$Mo$_6$O$_{17}$ (A=Na, K)