Abstract
The elastic constants and their pressure derivatives of rubidium iodide were measured at 295° and 195°K by the ultrasonic pulse-echo technique. The results are: dC 11 dP dC 12 dP dC 44 dP 295°K 13.16 1.66 −0.51 195°K 12.83 1.78 −0.55 The low temperature Grüneisen parameter was calculated and found to be negative in agreement with that predicted by G.K. White on the basis of thermal expansion data. These results can be understood qualitatively via a simple Born model.
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