Abstract
The photopyroelectric (PPE) technique is one of the photothermal (PT) methods mostly used for phase transitions investigations. In this paper, we want to compare the PPE results with those obtained using another, recently developed PT method [the photothermoelectric (PTE) calorimetry] for the same purpose of detecting phase transitions. The well-known ferro-paraelectric phase transition of TGS, taking place at a convenient temperature (about \(49\, {}^{\circ }\hbox {C}\)), has been selected for demonstration. A comparison of the two PPE and PTE methods, both in the back detection configuration (in the special case of optically opaque sample and thermally thick regime for both sensors and sample) shows that they are equally suitable for phase transitions detection. Performing a proper calibration, the amplitude and phase of the signals can be used in order to obtain the critical behaviour of all sample’s static and dynamic thermal parameters.
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Acknowledgments
Work supported in part by the Romanian Ministry of Education and Research Youth and Sport, through the National Research Programs, PN-II-ID-PCE-2011-3-0036, PN-II-RU-PD-2012-3-0050 and PN-II-RU-PD-2012-3-0270. One of the authors (DD) acknowledges Dr. V. Tosa for technical help concerning data processing.
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This article is part of the selected papers presented at the 18th International Conference on Photoacoustic and Photothermal Phenomena.
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Dadarlat, D., Guilmeau, E., Hadj Sahraoui, A. et al. Photothermoelectric (PTE) Versus Photopyroelectric (PPE) Detection of Phase Transitions. Int J Thermophys 37, 53 (2016). https://doi.org/10.1007/s10765-016-2059-8
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DOI: https://doi.org/10.1007/s10765-016-2059-8