Absolute scales for thermoelectricity
Abstract
Since 1976 we have developed three methods for the direct measurement of the Thomson coefficient (μ) of metals. In 1977 we found that the low-temperature scale of Jan, Christian, Pearson and Templeton (1958) was in error by 0.3 μV/K above about 30 K. In 1981 we verified Nystrom's (1948) values of μ Cu and provided scales based on lead from 0 to 350 K; on copper from 273 to 900 K; and, in 1985, on platinum from 900 to 1600 K. The measurements have all been cross-checked by showing that Kelvin's S = ∫(μ/T)dT is valid for measurements on pairs of metals.
- Publication:
-
Measurement
- Pub Date:
- 1986
- DOI:
- 10.1016/0263-2241(86)90016-3
- Bibcode:
- 1986Meas....4..101R