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Thermal Effusivity Investigations of Solid Thermoelectrics Using the Front Photopyroelectric DetectionCarmen Tripon,
Dorin Dadarlat,
Katalin Kovacs,
Victor Petru Tosa,
Mladen Franko, 2020, izvirni znanstveni članek
Opis: The front photopyroelectric configuration (FPPE), making use of air as a coupling
fluid between the sample and sensor, was applied to measure the thermal effusivity of
some solid thermoelectric materials. The investigated samples were ZnO, CuCrO2,
Cu4Sn7S16,
TiS3
and two samples of high manganese silicide (HMS) thermoelectric
materials. Most of these materials are porous and consequently, the classical PPE
method, making use of standard coupling fluids between sensor and sample, cannot
be used due to the fact that the coupling fluid penetrates inside the sample and leads
to incorrect results. With this work we extend (to thermoelectric solids) the area of
application of a method, recently proposed by Salazar et al. (Measurement 121: 96,
2018). Experimentally, the thermal effusivity is obtained from a multi-parametric
fit of the phase of the FPPE signal as a function of the modulation frequency (with
sample’s thermal effusivity, thickness of the sensor-sample air gap and heat losses
by convection and radiation, as fitting parameters). It was demonstrated that, in some
particular cases, the three parameters are independent and consequently, the solution
of the fit is unique. Where possible, the obtained results have been compared with
data from the literature and good agreement was found.
Ključne besede: Front photopyroelectric configuration (FPPE), Solid thermoelectrics, Thermal effusivity
Objavljeno v RUNG: 02.05.2020; Ogledov: 4074; Prenosov: 0
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