Dielectric non-Debye domain wall response and aging of SBN : Ce

Autor(en): Kleemann, W
Dec, J
Pankrath, R
Stichwörter: creep; domain wall; DYNAMICS; Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Condensed Matter; relaxation; relaxor; susceptibility; SYSTEMS
Erscheinungsdatum: 2003
Herausgeber: TAYLOR & FRANCIS LTD
Journal: FERROELECTRICS
Volumen: 291
Startseite: 75
Seitenende: 82
Zusammenfassung: 
Different non-Debye dielectric spectra are observed in different low-frequency regimes in a polydomain relaxor ferroelectric single crystal, Sr-0.603 Ce-0.007 Ba-0.39 Nb2O6 ( SBN :Ce), in the vicinity of its transition temperature, T-c approximate to 320 K. At f < 10 Hz the response is due to irreversible creeplike wall motion, chi' proportional to chi'' proportional to omega -beta with beta approximate to 0.2, while polydispersive reversible wall segment relaxation with pink noise character [Joffe and Vinokur, 1987] is encountered at larger frequencies, f > 10 Hz. The crossover between both kinds of dielectric response is attributed to a dynamical phase transition [Nattermann et al. 2001]. While nearly ideal creep is observed in as-cooled samples, deviations towards reversible very-low frequency relaxation are revealed after aging.
Beschreibung: 
7th International Symposium on Ferroic Domains and Mesoscopic Structures (ISFD7), GIENS, FRANCE, SEP, 2002
ISSN: 00150193
DOI: 10.1080/00150190390222565

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