The thermal conductivity κ(T) of pure deuterated ethanol has been measured at the equilibrium vapor pressure of its orientationally-ordered crystal form (T = 2 K − Tm), orientational glass, and glass state (T = 2 K − Tg, Tg is the glass transition temperature) solid phases. The temperature dependence of the conductivity is well described by the sum of two contributions, κ(T) = κI(T) + κII(T), where κI(T) accounts for heat transport by acoustic phonons and κII(T), for heat transfer by localized high-frequency excitations. The thermal conductivities of deuterated and hydrogenated ethanols are compared in the different phases. The mechanisms of phonon scattering in the glasses are analyzed. In these glasses the effect of complete deuteration shows up in the κII(T) term.
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