Electrical resistivity and thermal conductivity of W and Re up to 5 GPa and 2300 K

Abstract

The electrical resistivity of solid-state tungsten (W) and rhenium (Re) was experimentally measured at high pressures up to 5 GPa and temperatures up to ∼2273 K using a four-wire resistivity method. For both metals, the resistivity decreased as a function of pressure and increased as a function of temperature, in excellent agreement with 1 atm data. The Wiedemann–Franz law was used to calculate the total thermal conductivity from the resistivity. Thermal conductivity increased as a function of pressure for both metals, but decreased as a function of temperature for W and increased for Re. Values of thermal conductivity at high pressures and temperatures are consistent with most recommended previous experimental studies at 1 atm.

Resistivity of solid and liquid Fe–Ni–Si with applications to the cores of Earth, Mercury and Venus

“…Contact between each end of the sample and a TC was ensured through W-discs placed between the sample and wires. The contribution of the W-discs in the voltage drop between two opposite electrodes was later subtracted using available high P and T measurements of ρ 93 . A combination of Ohm’s and Pouillet’s laws was used to calculate ρ : where is the cross-sectional area and the length of the sample.…”

Electrical Resistivity Measurements of Fe‐Si With Implications for the Early Lunar Dynamo

“…Because W discs were used for all experiments, the measured voltage drop contains an additional contribution from W discs. The contribution of the W discs to the total measured resistivity was corrected (Littleton et al, 2019). The uncertainty on the measured geometry and the standard deviation from the averaged voltage drop at a particular T were used to evaluate the errors on ρ total and k e .…”

Electrical Resistivity of FeS at High Pressures and Temperatures: Implications of Thermal Transport in the Core of Ganymede

“…Voltages measured by the Type‐S TCs were corrected for P effects (Getting & Kennedy, 1970). Calculated P ‐ and T ‐dependent contributions to the measured voltages by the W disks were less than 2% (Littleton et al., 2019) and were ignored.…”

“…An illustration of the cross-section of the cubic P cell design used for all experiments in this work is shown in Figure 1. Similar three sectioned cubic P cells have been successfully implemented with a 4-wire resistance technique to measure the electrical resistivity of solid and liquid transition metals and transition metal alloys (Ezenwa & Secco, 2017a, 2017b, 2017cEzenwa et al, 2017;Littleton et al, 2018Littleton et al, , 2019Berrada et al, 2018;2020). All experiments were conducted in a 1000-ton cubic anvil press, as described by Secco (1995), to generate high quasi-hydrostatic P. Thorough descriptions of the P cell design are found in the Supporting Information section.…”