Abstract
Nb was processed and recovered intact from peak dynamic pressures in the range 0.6–1.2 Mbar. Pressure and effective-plastic-strain histories were calculated using a finite-element hydrodynamic computer code. Recovered specimens were characterized by X-ray diffraction, metallography, Vicker’s hardness, and superconducting transition temperature Tc. The maximum change observed in the Tc of 9.18 K for the unshocked specimen was a decrease of 0.035 K in the specimen shocked to a maximum pressure of 0.6 Mbar. Shock processing of V3Si at 1 Mbar was recently reported by Stewart et al. to depress Tc 1.8 K from the initial value of 16.4 K. These results indicate that shock-induced defects and disorder have a relatively weak effect on the Tc of equilibrium phases and suggest that shock-synthesized metastable superconductors might have Tc’s close to intrinsic values for the ordered material.
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Nellis, W.J. et al. (1986). Properties of Niobium Recovered from Megabar Dynamic Pressures. In: Gupta, Y.M. (eds) Shock Waves in Condensed Matter. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2207-8_104
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DOI: https://doi.org/10.1007/978-1-4613-2207-8_104
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