We have studied the thermal properties of a dense sintered YBa2Cu3O7 ceramic in the temperature interval between liquid neon and room temperature. By means of the temperature wave method we have measured the thermal di usivity D. The thermal conductivity of the same material was directly measured using a steady state longitudinal method. The speci c heat Cp was calculated utilizing the data for , D and the density of the samples. The results are discussed according to the theory of Debye and the total relaxation time .