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Investigation of the Dependence of Dielectric Properties of D-Serine Admixtured TGS Crystals on the Distance from the Seed of the Crystal Growth

100%
Stankowska J., Czarnecka A., Dongo Gemi B.
Acta Physica Polonica A
|
1993
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vol. 83
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issue 4
485-494
EN
Dielectric properties of a D-serine admixtured triglycine sulphate (TGS) crystal were studied on samples cut out from different sites in the crystal. The value of spontaneous polarization P_{s} measured on b-cuts was found to be independent of the site. Whereas the coercive field E_{c} values were higher for the samples cut out closer to the seed than for those cut out at the ends of the crystal along b axis. After rejuvenation the values of the bias field E_{b} increased in contrary to the effect observed in the pure TGS crystals. An exponentially decreasing dependence of the maximum permittivity ε_{max} on the site of the samples (b-plates) cut out along b axis from -b to +b positions, was obtained.
2
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The Effect of Ageing Process on the Electrogyration of Deuterated Triglycine Sulphate Crystals

100%
Koralewski M., Stankowska J., Habryło S.
Acta Physica Polonica A
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2002
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vol. 101
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issue 2
243-248
EN
The paper reports results of a study of optical activity and ferroelectric properties of rejuvenated and aged deuterated triglycine sulphate crystals. A possibility of monitoring of the ferroelectric crystal ageing process by optical measurements was proved. A linear relation between optical rotatory powerρ and spontaneous polarization P_s was confirmed for aged and rejuvenated deuterated triglycine sulphate crystals.
3
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Dielectric Properties of Triglycine Sulphate Crystals Admixtured With D- and DL-Phenylalanine

100%
Stankowska J., Peter E., Trybula M.
Acta Physica Polonica A
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2000
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vol. 97
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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.
4
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Dielectric Properties of Triglycine Sulphate Crystals Admixtured with L-Threonine

100%
Czarnecka A., Stankowska J., Mielcarek S.
Acta Physica Polonica A
|
1994
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vol. 85
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issue 5
849-858
EN
The influence of L-threonine admixture on the dielectric properties of triglycine sulphate (TGS) crystals was studied. With increasing concentration of the admixture in the solution from which the crystals were grown, their maximum permittivity and spontaneous polarization were found to decrease, their Curie point was found not much different than that for pure TGS crystals (322 K), the coercive field and bias field increased. The domain structure of the obtained crystals was also studied by the liquid crystal method.
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