Dielectric Dispersion in Ferroelectric Glycine Phosphite |
| R. Tchukvinskyi, Z. Czapla Institute of Experimental Physics, University of Wrocław, Pl. M. Borna 9, 50-204 Wrocław, Poland R. Sobiestianskas, A. Brilingas, J. Grigas Faculty of Physics, Vilnius University, Sauletekio Aleja 9, 2054 Vilnius, Lithuania and J. Baran Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-950 Wrocław 2, Poland |
| Received: April 24, 1997; in final form August 25, 1997 |
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| Dielectric dispersion in ferroelectric hydrogen bonded glicyne phosphite crystal was investigated in the frequency range 100 Hz - 27 GHz. Dielectric relaxation of Debye type observed in the paraelectric phase shows a critical slowing down of the polarization fluctuations. The relaxation frequency decreases with temperature according to fs = 0.305(T-T0) GHz in the paraelectric phase. The activation energy for flipping dipole motion ΔU = 2.07kTc confirms order-disorder character of the phase transition. In the ferroelectric phase pronounced low frequency (100 Hz - 1 MHz) dispersion related to domain contribution to permittivity was found. |
| DOI: 10.12693/APhysPolA.92.1191 PACS numbers: 77.80.Bh |