Absolute linear thermal-expansion measurements on copper and aluminum from 5 to 320 K
- 1 March 1977
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 48 (3), 853-864
- https://doi.org/10.1063/1.323746
Abstract
A linear absolute dilatometer based on a three‐terminal parallel‐plate capacitor design has been used to obtain thermal expansion data for high‐purity copper and aluminum from 5 to 320 K. These data have an absolute accuracy of ±0.1% above 20 K for copper and above 30 K for aluminum, and agree well with published data at the higher temperatures. The disagreement which exists with other data below 5 K for copper and below 15 K for aluminum is believed to be sample dependent, but the mechanism is not known. The aluminum results in this region depend on the state of annealing of the sample.Keywords
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