NMR evidence for the coexistence of order-disorder and displacive components in barium titanate |
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Authors: | Zalar Bostjan Laguta Valentin V Blinc Robert |
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Affiliation: | J. Stefan Institute, University of Ljubljana, Jamova 39, 1000 Ljubljana, Slovenia. |
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Abstract: | 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). |
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