Abstract
Dielectric response of K2SeO4 in the spectral region 5–460cm−1 was determined using transmissivity and reflectivity measurements as a function of temperature between 80 and 300K. The spectral features above 20cm−1 are interpreted using results of lattice vibrational analysis in three known commensurate phases. The low-frequency dielectric anomaly in the incommensurate phase can be roughly described by critical slowing-down of a Debye relaxation given rise to by the overdamped infrared active phason mode which softens at the incommensurate-commensurate transition.
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Petzelt, J., Kozlov, G.V., Volkov, A.A. et al. Far infrared and millimetre dielectric response of incommensurate and ferroelectric K2SeO4 . Z Physik B 33, 369–379 (1979). https://doi.org/10.1007/BF01319927
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DOI: https://doi.org/10.1007/BF01319927