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The 3 ω ‐method for thermal conductivity measurements in a bottom heater geometry
Author(s) -
Feuchter Manuel,
Jooss Christian,
Kamlah Marc
Publication year - 2016
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532466
Subject(s) - thermal conductivity , materials science , geometry , thermal , thermal conductivity measurement , composite material , thermodynamics , physics , mathematics
Abstract In this article, we investigate a bottom heater geometry configuration for the 3 ω ‐method, to determine the thermal conductivity of bulk‐like materials and thin covering layer materials. By finite element simulations, the temperature oscillations due to AC Joule heating are calculated in the time domain. Based on these calculations an understanding is developed for the dependence of the temperature amplitude on thermal conductivity and the chosen geometries. Since no closed form solution exists for these configurations, we developed a new evaluation methodology in order to identify the thermal conductivity of the investigated material. We discuss the determination of the cross‐plane thermal conductivity of materials in bulk and thin film geometries and verify the obtained result by an experiment, where a SrTiO3 thin film is deposited on top of a Pt heater.