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ELECTRICAL EFFECTS OF SHOCK WAVES: CONDUCTIVITY IN CSI AND KI. THERMOELECTRIC MEASUREMENTS IN METALS
STANFORD RESEARCH INST MENLO PARK CA POULTER LABS
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Incidence of a 400 kb shock wave in copper upon a constantan probe produces a peak emf of the order of 80 mv, compared with 14 mv calculated from zero-pressure thermopowers and theoretical shock temperatures. At 170 kb, measured peak emfs range from 23 to 90 mv, compared with 4 mv calculated similarly. Anomalously high emfs are also observed with aluminum-constantan, copperiron, and copper-aluminum junctions. Signal amplitudes are related approximately as they would be at zero pressure, with the exception of copper- iron in which the iron is known to undergo a phase transition. Electrical resistivities of single-crystal NaCl, KI, and CsI have been measured at several shock pressures in the range 84 to 274 kb. Resistivity measurement2 were performed parallel longitudinal geometry and perpendicular transverse geometry to the shock propagation direction the above values are for longitudinal geometry. The few measurements in transverse geometry indicate lower resistivities, particularly for KI.
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