Dresden 2003 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 6: Keramiken, Gradientenwerkstoffe und Relaxoren

DF 6.4: Vortrag

Mittwoch, 26. März 2003, 15:50–16:10, HSZ/403

SrTiO₃-PbZrO₃ Solid Solutions: From Incipient Ferroelectricity to Antiferroelectric State — •Andrej Sotnikov^1,2, Elena Smirnova¹, Manfred Weihnacht², Wolfgang Häßler², and Vladislav Lemanov¹ — ¹A.F.Ioffe Physical-Technical Institute, 194021 St.Petersburg, Russia — ²Institute for Solid State and Materials Research, D-01171 Dresden, Germany

The incipient ferroelectrics SrTiO₃ and induced phase transitions in SrTiO₃ are widely studied due to their low temperatures dielectric anomalies, unclear nature of induced ordered polar state , and possible applications.

The system of SrTiO₃ - PbZrO₃ is unique because various states such as incipient ferroelectrics, relaxor ferroelectrics , and antiferroelectrics were observed . In the present work we studied a ferroelectric state appeared in the system at low PbZrO₃ concentration and transformation to antiferroelectric state via relaxor-like behavior at higher concentration. For this purpose the dielectric properties of ceramic samples were measured between 10 Hz -1MHz in a wide temperature range from 4.2 K to 400 K. Polarization loops measurements were used to identify ferroelectric and antiferroelectric state. The main features of observed dielectric relaxation, FE behavior, and FE-AFE crossover are discussed.