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Dielectric Properties of Triglycine Sulphate Crystals Admixtured With D- and DL-Phenylalanine

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Stankowska J., Peter E., Trybula M.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 6
1061-1072
EN
The paper reports studies on the effect of D-phenylalanine and DL-phenylalanine admixtures on dielectric properties and domain structure of triglycine sulphate crystals. Permittivity ε and loss tangent tgδ were measured in a wide range of temperatures (10-340 K) as a function of measuring field varied from 1 to 10000 kHz, for samples cut out from two growth pyramids (001) and (110) from triglycine sulphate crystals containing different concentrations of admixtures. A comparison of the effects of D-phenylalanine and DL-phenylalanine admixtures on dielectric properties of triglycine sulphate crystals was made. With increasing concentrations of admixtures in the crystals, the values of ε_{max} decreased while E_{c} and E_{b} (bias field) increased, and P_{s} and T_{c} showed insignificant changes. Observations of the domain structure of the admixtured crystals by the liquid crystal method proved its refinement and irregularity. Changes in the domain structure of the crystals occurring in the process of spontaneous ageing were analysed.
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