Shock-Compression Recovery Experiments on Some Dioxides
Abstract
The AX2 materials are known to undergo phase transitions yielding products with a high coordination structure, a high bulk modulus, and possibly a high hardness. These products may be quenchable at ambient pressure and may then be interesting in material sciences as well as in earth sciences. Shock-compression recovery experiments were performed on some dioxides (ruthenium, hafnium, tellurium, molybdenum, tungsten and lead) using a powder gun to synthesize their high pressure phases. As a result, for ruthenium dioxide (RuO2), the CaCl2-type high pressure phase was obtained by the shock compression of the mixture with copper. Hafnium dioxide (HfO2) present a partial phase transition to its orthorhombic-I phase. With higher shock velocity, some trace of the orthorhombic-II phase can also be found. These results are in good agreement with static results at the same pressures. The experiments on these dioxides and on the others are currently under study.
- Publication:
-
APS Shock Compression of Condensed Matter Meeting Abstracts
- Pub Date:
- July 1997
- Bibcode:
- 1997APS..SHK..D302V