Measurements of Thomson Coefficients for Metals at High Temperatures and of Peltier Coefficients for Solid-Liquid Interfaces of Metals

Abstract

Apparatus has been devised for measuring and measurements made of Thomson coefficients of metals at high temperatures. It is found that in the range from 400\ifmmode^\circ\else\textdegree\fi{}C to the melting point the approximation $\ensuremath{\sigma}=\ensuremath{\beta}T$ is adequate for platinum, palladium, copper, and silver but not for gold, molybdenum, and tungsten.Experimental results for the Peltier coefficients for solid-liquid interfaces of gold, silver, and copper are also reported. An experimental sensitivity of 0.1 millivolt revealed no effect in gold and silver, but + 10.2 millivolts were obtained for copper.