Thermal conductivity and heat capacity of solid nabr under pressure |
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Authors: | I Sigalas B Håkanson P Andersson |
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Affiliation: | (1) Department of Physics, University of Umeå, S-901 87 Umeå, Sweden;(2) Present address: National Institute for Materials Research, Council for Scientific and Industrial Research, P.O. Box 395, 0001 Pretoria, Republic of South Africa |
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Abstract: | Using the transient hot-wire method, measurements were made for solid NaBr of both the thermal conductivity and the heat capacity per unit volume. The measurements were performed in the temperature range 100 to 400 K and at pressures up to 2 GPa. An adiabatic compression technique allowed the determination of the thermal expansivity as a function of pressure at room temperature. The heat capacity did not vary with pressure. Analysis of the thermal conductivity data showed that it can be described adequately by the Leibfried-Schlömann formula. For temperatures up to 400 K only acoustic modes needed to be taken into account. A small contribution of optic modes to the heat transport might be apparent at the highest temperatures. |
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Keywords: | heat capacity high pressure sodium bromide (NaBr) thermal conductivity thermal expansivity |
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