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Peculiarities of Dielectric Relaxation in DMAAS Ferroelectric Crystals

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Kapustianik V., Czapla Z., Czukwinski R.

Acta Physica Polonica A

2002

vol. 102

issue 3

365-372

This paper presents the results of investigations of the dielectric properties of NH_2(CH_3)_2Al(SO_4)_2×6H_2O crystals performed in a wide frequency range. In particular, the temperature and frequency dependences of the dielectric permittivity were measured in the region of ferroelectric phase at different rates of temperature change. The thermal dipole relaxation with a critical slowing-down at T_{c1} was observed at comparatively low frequencies of measuring field. The relaxation connected with the domain freezing takes place at still lower frequencies (below 100 kHz) and was found to be strongly dependent on the rate of the temperature change. It was shown that deuteration results in a noticeable change of the parameters characterising this process including the temperature of domain wall freezing.

Dielectric Investigation of Glycine Phosphite Crystal

100%

Czukwinski R., Czapla Z., Styrkowiec R.

The complementary measurements of the dielectric dispersion in ferroelectric phase of glycine phosphite crystal at the frequency range of 200 Hz - 1 MHz have been carried out. The analysis of the dielectric spectra of the low frequency relaxation process showed that it can be fitted by two Debye-type relaxators. The activation energy of the both processes has been calculated. The observed behaviour of the relaxators suggests that they are connected with a domain structure; one with the growth of the nuclei whereas the second with the domain wall movement.

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2 Acta Physica Polonica A

1 2002

1 2001

2 Czapla Z.

2 Czukwinski R.

1 Kapustianik V.

1 Styrkowiec R.

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Peculiarities of Dielectric Relaxation in DMAAS Ferroelectric Crystals

Dielectric Investigation of Glycine Phosphite Crystal