Abstract
The zero-field elastic constants of iron have been measured from 4.2 to 300°K using the ultrasonic pulse technique. Extrapolation of the data to absolute zero gives , , and , all expressed in units of dyne . The corresponding limiting value of the Debye temperature is K. Using this figure, the low-temperature heat capacity data for iron have been reanalyzed assuming the presence of a spin-wave contribution to the specific heat, i.e., the heat capacity is assumed to follow the relation . A least squares fit of versus gives cal , . There is agreement, within experimental error, between the latter figure and the theoretical estimate of obtained from the low-temperature magnetization data of Fallot. From the room temperature elastic constants, the compressibility of iron is found to be , which agrees exactly with the static value obtained by Bridgman.
- Received 1 February 1961
DOI:https://doi.org/10.1103/PhysRev.122.1714
©1961 American Physical Society