Abstract
Thermal waves with penetration depths ranging from 150 μm to 3 μm and amplitudes smaller than 0.1 mK were used to investigate the ferroelectric phase transition in colemanite. The critical behavior of the pyroelectric current is found to be independent of the penetration depth. It agrees well with the prediction from mean field theory for the temperature derivative of the bulk order parameter. The results are discussed in terms of a possible application of the thermal wave method to the investigation of surface critical phenomena.
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This was first assigned to relaxational phenomena which, according to Blinc and Zeks [2], should occur around 110 kHz in colemanite. That value, however, later turned out to have been a misprint, since Brosowski et al. reported that these phenomena arose at 110 MHz! Brosowski, G., Luther, G., Peterson, J.: Z. Naturforsch. Teil A28, 1814 (1973)
Luther, G.: Phys. Status Solidi A20, 227 (1973)
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Fenzl, W., Schuppler, S. Thermal-wave investigation of the ferroelectric phase transition in colemanite. Z. Physik B - Condensed Matter 93, 343–348 (1994). https://doi.org/10.1007/BF01312705
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DOI: https://doi.org/10.1007/BF01312705