Kondo, Ken-ichi and Sawaoka, Akira and Ahrens, Thomas J. (1981) Electrical measurements on fused quartz under shock compression. Journal of Applied Physics, 52 (8). pp. 5084-5089. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:20120717-155256329
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The resistivities of specimens of SiO_2 (fused quartz) singly and doubly shocked in the 10–45 and 27–90 GPa ranges, respectively, demonstrate a marked decrease from values of ∼10–0.1 Ω⋅m at a single‐shock pressure of ∼40 and a double‐shock pressure of ∼74 GPa. These states correspond to calculated shock temperatures of ∼3300 and ∼3600 K, respectively. At shock pressures below 36 GPa the measured resistivity versus calculated shock temperature agrees closely with ambient‐pressure and high‐temperature resistivity data. This suggests that the ionic conduction mechanisms inferred to control electrical properties at ambient pressure also act under shock‐induced high temperatures in quartz and the presumed high‐pressure phase, stishovite into which fused quartz appears to transform above 20 GPa. At 36–40 GPa the rapid decrease in resistivity by a factor of 10^2 suggests a further transformation to an unknown phase which may correspond to the onset of melting. The existing pressure‐density Hugoniot data do not demonstrate any anomalous density change associated with this phase change.
|Additional Information:||© 1981 American Institute of Physics. Received 28 January 1981; accepted for publication 23 April 1981. The authors appreciate the interest and encouragement proffered by Y. Syono of Tohoku University in carrying out this research. The work was partially supported under the Japan-U.S. Cooperative Science Program: Y. Syono and T. J. Ahrens are grateful for the support from the Japan Society for the Promotion of Science (grant 4R032) and U.S. National Science Foundation (grant DES 75-15006 and FJ4035). Contribution No. 3565, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.|
|Subject Keywords:||QUARTZ, SHOCK WAVES, COMPRESSION, ELECTRICAL PROPERTIES, ELECTRIC CONDUCTIVITY, DATA, VERY HIGH PRESSURE, PRESSURE DEPENDENCE, MATHEMATICAL MODELS, THEORETICAL DATA, IONIC CONDUCTIVITY, STISHOVITE, PHASE TRANSFORMATIONS|
|Other Numbering System:|
|Classification Code:||PACS: 64.90.+b, 62.50.-p, 66.30.Dn, 77.90.+k|
|Official Citation:||Electrical measurements on fused quartz under shock compression Ken‐ichi Kondo, Akira Sawaoka, and Thomas J. Ahrens J. Appl. Phys. 52, 5084 (1981); http://dx.doi.org/10.1063/1.329459|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||18 Jul 2012 17:12|
|Last Modified:||26 Dec 2012 15:35|
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