NMR evidence for the coexistence of order-disorder and displacive components in barium titanate

NMR evidence for the coexistence of order-disorder and displacive components in barium titanate

A quadrupole coupling induced 47Ti and 49Ti satellite background which transforms into well-defined satellite lines below T(c) in the ferroelectric phase has been observed in the cubic phase of an ultrapure BaTiO3 single crystal. The results demonstrate the coexistence of a displacive and order-diso...

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Veröffentlicht in:Physical review letters 2003-01, Vol.90 (3), p.037601-037601, Article 037601
Hauptverfasser: Zalar, Bostjan, Laguta, Valentin V, Blinc, Robert
Format: Artikel
Sprache:eng
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Zusammenfassung:A quadrupole coupling induced 47Ti and 49Ti satellite background which transforms into well-defined satellite lines below T(c) in the ferroelectric phase has been observed in the cubic phase of an ultrapure BaTiO3 single crystal. The results demonstrate the coexistence of a displacive and order-disorder component in the phase transition mechanism and tetragonal breaking of the cubic symmetry due to biased Ti motion between off-center sites in the paraelectric phase above T(c).
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.90.037601