Phase transitions in Sr0.61Ba0.39Nb2O6 : Ce3+: I. Susceptibility of clusters and domains

Autor(en): Dec, J
Kleemann, W
Woike, T
Pankrath, R
Stichwörter: BRONZE FAMILY CRYSTALS; Physics; Physics, Condensed Matter; RARE-EARTH ELEMENTS; RELAXOR FERROELECTRICS; STATES; STRONTIUM-BARIUM NIOBATE
Erscheinungsdatum: 2000
Herausgeber: SPRINGER VERLAG
Journal: EUROPEAN PHYSICAL JOURNAL B
Volumen: 14
Ausgabe: 4
Startseite: 627
Seitenende: 632
Zusammenfassung: 
The complex dielectric susceptibility of Sr0.61Ba0.39Nb2O6:Ce3+ (SBN61:Ce) has been measured at frequencies 10(2) less than or equal to f less than or equal to 10(7) Hz and temperatures 300 less than or equal to T less than or equal to 470 K before and after poling. The relaxer behaviour with large polydispersivity observed above the ferroelectric phase transition temperature, T-c = 360 and 340 K for x(Ce) = 0 and 0.0066, respectively, is perfectly modeled within the framework of Chamberlin's dynamically correlated domain approach. Below T-c the dynamic nanodomain state crosses over into a ferroelectric state with polydispersive domain wall dynamics at very low frequencies. Presumably SBN61:Ce belongs to the three-dimensional random field Ising rather than to the dipole glass universality class.
ISSN: 14346028
DOI: 10.1007/s100510051071

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