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DF: Dielektrische Festkörper

DF 6: Poster

DF 6.10: Poster

Wednesday, March 13, 2002, 14:30–18:00, Poster Chemie C

Dielectric spectroscopy of ferroelectric betaine phosphite with admixture of the antiferroelectric betaine phosphate — •Juras Banys¹, Arminas Kajokas¹, Saulius Lapinskas¹, Jan Macutkevic¹, Georg Voelkel², and Carola Klimm² — ¹Fakultaet fuer Physik, Universitaet Vilnius, Litauen — ²Fakultaet fuer Physik und Geowissenschaften, Universitaet Leipzig

The dielectric behaviour of ferroelectric hydrogen bonded deuterated betaine phosphate / betaine phosphite (DBP/DBPI) crystals with 0.01, 0.03 percent admixture of DBP is investigated in the region of the ferroelectric phase transition. A small admixture of betaine phosphate is already able to change noticeably the character of the phase transition of deuterated betaine phosphite. In ferroelectric phase the distribution function of the relaxation times of DBPI with 3 percent of BP broaden continuously with the temperature decrease and deviate from the monodispersive character. The real distribution of the relaxation time of both mixed crystals have been obtained. The temperature behaviour of the local polarization distribution function confirms the inhomogeneous ferroelectric properties of the deuterated betaine phosphite with 3 percent admixture of betaine phosphate.