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Schematic cross section of the open photoacoustic cell, which consists in a typical electret microphone with a metalized electret diaphragm separated from a metal back plate.
Photoacoustic measurement on the YSZ sample: Natural logarithm of the rescaled normalized amplitude (triangles) and normalized phase (squares) as function of the square root of the modulation frequency. Solid lines represent the best fitting curves.
Photoacoustic signal amplitude as function of the modulation frequency for the 4.61 composite LSCF+YSZ film sample. The solid curve fits the data to Eq. (1) , and the inset shows the details in the frequency range in which the dependence is observed.
Photoacoustic signal amplitude as function of the modulation frequency for the composite LSCF+YSZ film samples. The solid curves fit the data to Eq. (1) , considering only the frequency range in which the thermoelastic contribution is predominant.
Effective thermal diffusivity of the composite LSCF+YSZ (open symbols) and pure LSCF (solid symbols) film samples as function of the thickness fraction x. The solid lines represent the best data fitting to Eq. (2) .
Effective thermal expansion coefficient of the (a) composite LSCF+YSZ and (b) pure LSCF film samples as function of the thickness fraction x. The solid lines represent the best data fitting to Eq. (3) .
Thermal diffusivity ( ), thermal conductivity ( ), and thermal expansion coefficient ( ) of the investigated materials.
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