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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
|
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.
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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
|
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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