THE SHOCK HUGONIOT OF SINGLE-CRYSTAL SODIUM CHLORIDE.
BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD
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Shock Hugoniot data for single-crystal sodium chloride have been obtained within the pressure range from 90 to 700 kbar. The data in the shock velocity - particle velocity plane do not clearly define the onset of the transition from face-centered-cubic NaCl to body-centered CsCl structure, but show evidence of it by a displacement which is first detected between 260 and 280 kbar for the 100 orientation and between 220 and 230 kbar for the 111 orientation. Lateral relaxation measurements on 111 specimens provide evidence of the transition at 208 kbar. After the displacement which occurs near the onset of the transition, data in the shock velocity - particle velocity plane follow a linear relation up to 460 kbar, where the Hugoniot stiffens to enter a third region which extends linearly up to 700 kbar and probably to higher pressures. It is tentatively suggested that the third region from 460 to 700 kbar represents the body-centered structure, and that the second region may be a manifestation of the experimental techniques. The data are compared with those of other investigators. Author
- Solid State Physics