TY - JOUR
T1 - Thermal conductivity measurement under hydrostatic pressure using the 3ω method
AU - Chen, Feng
AU - Shulman, Jason
AU - Xue, Yuyi
AU - Chu, C. W.
AU - Nolas, George S.
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2004/11
Y1 - 2004/11
N2 - 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.
AB - 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.
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U2 - 10.1063/1.1805771
DO - 10.1063/1.1805771
M3 - Article
AN - SCOPUS:10844282597
SN - 0034-6748
VL - 75
SP - 4578
EP - 4584
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 11
ER -