Resistance, Emissivities and Melting Point of Tantalum

Nonisentropic Release of a Shocked Solid

“…In all cases, the inferred release temperature exceeds the theoretical isentropic release temperature calculated using a high-pressure equation of state [48]. In fact, the data appear to follow more closely the Hugoniot (the locus of shock states) up to around 150 GPa, above which the release temperature saturates at the ambient melt temperature T M = 3 270 K [51] (due to the finite enthalpy of melting preventing the release path from crossing the melt curve). We calculated the 95% confidence interval of one-parameter parabolic fits to the unsaturated data of the form T (p|κ) = 300 K + κp 2 using Bayesian regression, and found that the interval excludes the locus of isentropic release states.…”

Flash melting of tantalum in a diamond cell to 85 GPa

“…To test the accuracy of the melting criterion and reproducibility of the results of the described heating procedure, we flash-heated a 30 µm thick polished Ta foil in an argon gas flow at 1 atmosphere below and above the known melting temperature of 3270 K [37,38] (Fig. 3).…”

The Specific Heat of Metals Between 1200°K and 2400°K

“…The good agreement between Worthing's and Larrabee's results for tungsten is noteworthy if only because Larrabee's tungsten was certainly very much purer than that used by Worthing. (The small effect of impurities on optical emissivity was also noted by Malter and Langmuir (1939)). Worthing's results were used up to 1600 0 K and then those of Larrabee.…”