2001
DOI: 10.1088/0953-8984/13/39/309
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Off-centre displacements and ferroelectric phase transition in dilute KTa1-xNbxO3

Abstract: We present a theory of the Nb-ion off-centre displacements and ferroelectric phase transition in dilute KTa1-xNbxO3. We believe that this theory is generally applicable to ferroelectric transitions in incipient ferroelectrics induced by impurities. We show that the non-uniform strong intraband electron-phonon interaction leads to the localization of virtual conduction band electrons around the Nb ions and to the off-centre displacements of these ions. We consider the off-centre displacements as pseudospins and… Show more

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Cited by 26 publications
(14 citation statements)
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“…It was clearly shown that the Ti sits off-center not only in the tetragonal but also in the cubic phase. This off-center scenario confirms theoretical studies [10][11][12][13] which showed a combined displacive and order-disorder character of the transitions in BaTiO 3 . Recently, the Girshberg-Yacoby off-center cation model of perovskite ferroelectrics has also been successfully applied to the cubic-tetragonal transition of BaTiO 3 [14].…”
Section: Order and Disorder In Batiosupporting
confidence: 88%
“…It was clearly shown that the Ti sits off-center not only in the tetragonal but also in the cubic phase. This off-center scenario confirms theoretical studies [10][11][12][13] which showed a combined displacive and order-disorder character of the transitions in BaTiO 3 . Recently, the Girshberg-Yacoby off-center cation model of perovskite ferroelectrics has also been successfully applied to the cubic-tetragonal transition of BaTiO 3 [14].…”
Section: Order and Disorder In Batiosupporting
confidence: 88%
“…The cubic-tetragonal phase transition in BaTiO 3 is thus neither a pure "order-disorder" transition nor a pure "displacive" transition but rather of mixed character [10].…”
Section: Downloaded By [Uq Library] At 05:36 03 November 2014mentioning
confidence: 96%
“…The study of spontaneous polarization P 5 , determined from the measurements of the hysteresis loops [16], has shown that the edge characteristic of PS appears in the polarization vs. field diagram only at sufficiently low, mHz-scale frequencies, due to a finite speed of domain wall motion, and PS increases with Nb concentration (at least, for x < 0.12). [22] and is supported by both x-ray absorption fine structure (XAFS) experiments [23] and theoretical calculations [24][25][26][27][28][29][30]. That is, not only the transition temperature itself, but also its behaviour and main characteristics of PTs in KTO crucially depend on the presence and concentration of Nb impurities.…”
mentioning
confidence: 86%