The method of distinguishing the drum from the plasma wave effect in the photoacoustic spectra on the example of CdSe and CdMgSe crystals

•CdSe and CdMgSe samples have been investigated experimentally and theoretically.•It was proved that the experimental PA spectra of these samples exhibit the strong drum effect.•The method of distinguishing between the drum and plasma effects in the PA spectra is proposed. This paper presents result...

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Bibliographic Details
Published in:Thermochimica acta 2016-10, Vol.641, p.79-84
Main Authors: Chrobak, Ł., Maliński, M., Zakrzewski, J.
Format: Article
Language:English
Subjects:
AII-BVI crystals
CdMgSe
CdSe
Drum effect
Nondestructive testing
Photoacoustics
Plasma waves
Thermal parameters
Thermal waves
Transport parameters
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Summary:•CdSe and CdMgSe samples have been investigated experimentally and theoretically.•It was proved that the experimental PA spectra of these samples exhibit the strong drum effect.•The method of distinguishing between the drum and plasma effects in the PA spectra is proposed. This paper presents results of experimental and theoretical studies of the plasma wave and the drum effect in the photoacoustic (PA) spectra of CdSe and CdMgSe samples. The PA experimental amplitude and phase frequency characteristics of these samples have been shown. The experimental results have been interpreted in two different PA models: in the model of a drum effect and in the plasma wave model. The obtained results have been discussed and presented in this paper. They indicate that the values of extracted parameters depend on the model of the PA signal. To distinguish between the plasma and the drum model the aluminium foil test is proposed. From the results obtained one can conclude that the plasma model used for interpretation of the PA characteristics yields overestimated values of the thermal diffusivity and poor PA phase fittings. The results obtained using the drum model agree well with other measurements conducted on the investigated samples.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2016.08.018