THE THERMAL CONDUCTIVITY AND SEEBECK COEFFICIENT OF SOME CUBIC SODIUM TUNGSTEN BRONZES.
Technical rept. no. 12 (Master's thesis),
SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY RAPID CITY
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The thermal conductivity and Seebeck coefficient of two cubic sodium tungsten bronze samples NaxW03 with x-values of 0.513 and 0.804 were measured in the temperature range of 350 to 700K. The thermal conductivity measurements were made using a series comparative method with Armco iron as the standard. The Seebeck coefficients were calculated from the measured Seebeck voltages of the bronze samples with respect to Chromel and Alumel and the known Seebeck coefficients of Chromel and Alumel. The thermal conductivities of both samples were found to increase with increasing temperature with a discontinuity between 400 and 500K. The positive temperature coefficients were interpreted as a combination of electron and phonon conduction both limited by impurity scattering. The discontinuity was interpreted as a disordering of the sodium atoms.