Abstract
The lattice constants of a graphite single crystal, natural graphite powder, and artificial graphite powder have been measured at 297°K, 78°K, and 4.2°K. The -spacing does not change in this temperature range within the error of ±0.0005 A. The material with the greatest -spacing showed between 297° and 78° the greatest change of -spacing and the smallest change below 78°. The -spacing of the artificial powder did not return to its original value at 297° after a thermal cycle, demonstrating irreversible deformation.
- Received 2 May 1955
DOI:https://doi.org/10.1103/PhysRev.100.544
©1955 American Physical Society