Electrical Resistance of Liquid Carbon (up to 9000 K) and Liquid Gadolinium (up to 6000 K) at Elevated Pressure and High Temperatures

IF 1 4区物理与天体物理 Q4 PHYSICS, APPLIED High Temperature Pub Date : 2024-03-21 DOI:10.1134/s0018151x23050127

S. V. Onufriev, A. I. Savvatimskiy

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Abstract

Experiments are carried out on rapid heating by an electric current pulse of plates for anisotropic graphite and gadolinium foil clamped in the same way: between two thick-walled plates of TF-5 glass (heavy flint). In both cases, the glass cells were previously compressed with a clamp to create some initial pressure. During the passage of the current pulse (5 μs), the pressure in the samples is estimated; it increases due to thermal expansion when confined by the glass plates. The electrical resistance of liquid carbon at low pressures (up to 1 kbar) increases with increasing temperature, just as for most conductors. Under limited expansion (increasing pressure), the electrical resistance of liquid carbon becomes constant, independent of the increase in temperature and pressure (up to 9000 K). Unlike carbon, the electrical resistance of liquid gadolinium at elevated pressure (about 1 kbar) practically did not change (~260 µm cm) and remained approximately constant, as at lower pressures (~0.3 kbar); and at high temperatures, up to 6000 K.

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液态碳（最高 9000 K）和液态钆（最高 6000 K）在高压和高温下的电阻特性

摘要实验是通过电流脉冲快速加热各向异性石墨板和钆箔，夹持方式相同：夹在两块厚壁 TF-5 玻璃板（重燧石）之间。在这两种情况下，玻璃单元之前都用夹具压紧，以产生一些初始压力。在电流脉冲通过期间（5 μs），对样品中的压力进行估算；在玻璃板的限制下，压力会因热膨胀而增加。与大多数导体一样，液态碳在低压（最高 1 kbar）下的电阻会随着温度的升高而增大。在有限膨胀（压力增加）的情况下，液态碳的电阻会变得恒定，与温度和压力的增加无关（最高可达 9000 K）。与碳不同，液态钆在高压（约 1 千巴）下的电阻几乎没有变化（约 260 微米厘米），与在低压（约 0.3 千巴）和高温（高达 6000 K）下的电阻大致保持不变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Temperature 物理-物理：应用

CiteScore

1.50

自引率

40.00%

发文量

审稿时长

4-8 weeks

期刊介绍： High Temperature is an international peer reviewed journal that publishes original papers and reviews written by theoretical and experimental researchers. The journal deals with properties and processes in low-temperature plasma; thermophysical properties of substances including pure materials, mixtures and alloys; the properties in the vicinity of the critical point, equations of state; phase equilibrium; heat and mass transfer phenomena, in particular, by forced and free convections; processes of boiling and condensation, radiation, and complex heat transfer; experimental methods and apparatuses; high-temperature facilities for power engineering applications, etc. The journal reflects the current trends in thermophysical research. It presents the results of present-day experimental and theoretical studies in the processes of complex heat transfer, thermal, gas dynamic processes, and processes of heat and mass transfer, as well as the latest advances in the theoretical description of the properties of high-temperature media.