Characterization of the pressure coefficient of manganin and temperature evolution of pressure in piston-cylinder cells
| Autor: | Ulrich Tutsch, Raquel A. Ribeiro, Paul C. Canfield, Michael Lang, Arif Ata, Li Xiang, Sergey L. Bud'ko, Elena Gati |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Piston cylinder Analytical chemistry 01 natural sciences Pressure coefficient 010305 fluids & plasmas law.invention Pressure range Pressure measurement Temperature and pressure law 0103 physical sciences Practical algorithm Instrumentation Manganin Ambient pressure |
| Zdroj: | The Review of scientific instruments. 91(9) |
| ISSN: | 1089-7623 |
| Popis: | We report measurements of the temperature- and pressure-dependent resistance, R(T, p), of a manganin manometer in a 4He-gas pressure setup from room temperature down to the solidification temperature of 4He (Tsolid ∼ 50 K at 0.8 GPa) for pressures, p, between 0 GPa and ∼0.8 GPa. The same manganin wire manometer was also measured in a piston-cylinder cell (PCC) from 300 K down to 1.8 K and for pressures between 0 GPa and ∼2 GPa. From these data, we infer the temperature and pressure dependence of the pressure coefficient of manganin, α(T, p), defined by the equation Rp = (1 + αp)R0, where R0 and Rp are the resistances of manganin at ambient pressure and finite pressure, respectively. Our results indicate that upon cooling, α first decreases, then goes through a broad minimum at ∼120 K, and increases again toward lower temperatures. In addition, we find that α is almost pressure-independent at T ≳ 60 K up to p ∼ 2 GPa, but shows a pronounced p dependence at T ≲ 60 K. Using this manganin manometer, we demonstrate that p overall decreases with decreasing temperature in the PCC for the full pressure range and that the size of the pressure difference between room temperature and low temperatures (T = 1.8 K), Δp, decreases with increasing pressure. We also compare the pressure values inferred from the manganin manometer with the low-temperature pressure, determined from the superconducting transition temperature of elemental lead (Pb). As a result of these data and analysis, we propose a practical algorithm to infer the evolution of pressure with temperature in a PCC. |
| Databáze: | OpenAIRE |
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