Thermal conductivity measurement under hydrostatic pressure using the 3ω method

Feng Chen, Jason Shulman, Yuyi Xue, C. W. Chu, George S. Nolas

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

We have designed and modeled new techniques, based on the 3ω method, to measure thermal conductivity of liquids (κ l) and solids (κ S) under hydrostatic pressure (P). The system involves a solid sample immersed in a liquid pressure medium, both of which have unknown thermal properties. The temperature (T) and P dependance of κ l are first determined through the use of a modified 3ω technique. This method uses a conducting wire (Pt, in this work), which is immersed in the pressure medium, as the heater/sensor. In addition to κ l, this allows for the accurate determination of the specific heat per volume of the liquid and Pt, (ρC) l and (ρC) Pt, respectively. The information of κ l and (ρC) l can then be used to make corrections to measurements of κ S, in which the sample is immersed in the pressure medium, and a metal strip acts as the heater/sensor. We present the T and P dependence of κ l, and (ρC) l for the widely used pressure medium 3M Fluorinert FC77 up to 0.8 GPa. The measurement of κ S for a thermoelectric clathrate material, Sr 8Ga 16Ge 30, in FC77 is analyzed in detail, and the refined data achieves an accuracy of 1%. The setup can be modified to measure κ and ρC up to 3.5 GPa.

Original languageEnglish
Pages (from-to)4578-4584
Number of pages7
JournalReview of Scientific Instruments
Volume75
Issue number11
DOIs
Publication statusPublished - 2004 Nov

All Science Journal Classification (ASJC) codes

  • Instrumentation

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