Abstract
Measurements of the dielectric permittivity around the ferroelectric transition of betaine arsenate and around the antiferroelectric one of deuterated betaine arsenate reveal relaxation-type dispersions in the upper MHz-region. The data analysis points to two mechanisms which contribute to the low temperature phase transitions of these crystals. In case of betaine phosphate Raman-spectra demonstrate that besides the antiferroelectric transition at 86 K a second structural transition exists at 81 K. Both transitions correlate with dielectric anomalies and the unit cell doubles at 81 K.
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Dedicated to Prof. Dr. H.E. Müser on the occasion of his 60th birthday
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Freitag, O., Brückner, H.J. & Unruh, H.G. Investigations on the dynamics of ferro- and antiferroelectric betaine compounds. Z. Physik B - Condensed Matter 61, 75–80 (1985). https://doi.org/10.1007/BF01308945
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DOI: https://doi.org/10.1007/BF01308945