Thermoelectric Power of Selected Binary Alloy Systems Part II — Copper-Palladium, Gold-Palladium, and Silver-Palladium

Abstract

Because the scale of the absolute thermoelectric power commonly used throughout the world in the past 45 years or so had become known to be much in error, a revised scale of the absolute thermoelectric power from 0 to 1300 K had been developed to replace the old scale, which was reported in Part I of this work [1] along with the recommended values for the thermoelectric power of aluminum-copper, copper-nickel, and iron-nickel alloy systems.

Reported in this Part II are the recommended values for the thermoelectric power of copper-palladium, gold-palladium, and silver-palladium alloy systems, which were resulted from exhaustive compilation, careful conversion to the revised scale, and critical evaluation, analysis, and synthesis of the available experimental raw data. In the available data, serious gaps exist for both composition and temperature dependences.

In generating the recommended values which cover a full range of composition and temperature, experimental data for both temperature and composition dependences were utilized. Confusion in the thermoelectric power data for Cu-Pd was clarified with the help of the phase diagram. Data below 700 K for alloys with roughly 10–47% Pd which were not completely disordered were therefore justifiably set aside. With no phase-diagram complications arising for Au-Pd and Ag-Pd, the critical evaluation was considerably simplified and recommended values were generated in a relatively straight forward manner.

In addition to the recommended values which are presented in this Conference, experimental data and information have been exhaustively compiled and details of data evaluation, analysis, and synthesis documented [2].

This work has been supported by the Office of Standard Reference Data, National Bureau of Standards, Washington, DC.