On the van der Pauw's method applied to the measurement of low thermal conductivity materials.

Author
Morales, C · Flores, E · Bodega, J · Leardini, F · Ferrer, I J · Ares, J R · Sánchez, C
Published 2016-08
Journal The Review of scientific instruments
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Abstract

The electrical van der Pauw's method has recently been extended to measure the thermal conductivity of different elements and compounds. This technique provides an easy way to determine the sample in-plane thermal conductivity by avoiding the influence of the thermal contact resistances. However, the reported calculated error values appear to be underestimated when dealing with the materials with low thermal conductivity (<5 W/Km) at room temperature. The causes of this underestimation are investigated in this communication and it has been found that they are due to the drastic influence of conduction heat losses through the thermo-resistance wires as well as the resulting modification of the sample temperature map. Both phenomena lead to experimental values of the sample thermal conductivity, which are systematically higher than the tabulated ones. The magnitude of this systematic error is ∼100% dealing with the samples of macroscopic dimensions, and low thermal conductivity indicated that the obtained accurate measurements can be quite challenging.

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Details

Title
On the van der Pauw's method applied to the measurement of low thermal conductivity materials.
Author
Morales, C · Flores, E · Bodega, J · Leardini, F · Ferrer, I J · Ares, J R · Sánchez, C
Published
2016-08
Year
2016
Journal
The Review of scientific instruments
Type
Research Article
Language
eng
PMID
27587145
Keywords
Thermal Conductivity · Measurement
This is Version 1 of this record. We added this version on September 4, 2016. This version is based on an original data import from MEDLINE®/PubMed®.