Abstract
The elastic constants of single-crystal barium fluoride have been determined in the 4.2-300°K temperature range, by an ultrasonic pulse-echo technique. The values of the elastic constants, extrapolated to 0°K, in units of dyn/, are: , , and . The constants , and change by about 10%, while hardly changes over the above temperature range. Barium fluoride is found to be mechanically isotropic, the value of the anisotropy factor being close to unity between 4.2 and 300°K. A value of 282°K for the Debye temperature at 0°K is computed from the elastic constants. The values of the elastic constants are deduced theoretically from a rigid-ion model, and the results compared with the experimental data.
- Received 2 April 1964
DOI:https://doi.org/10.1103/PhysRev.135.A1331
©1964 American Physical Society