Polarization switching and long-time relaxation effects induced by off-center ions in KTa/sub 1-x/Nb/sub x/O/sub 3/

L.A Knauss,P Adhikari,J Toulouse,B.E Vugmeister,C Jaquays

doi:10.1109/isaf.1992.300639

Polarization switching and long-time relaxation effects induced by off-center ions in KTa/sub 1-x/Nb/sub x/O/sub 3/

L.A Knauss, P Adhikari + Show 3 more

https://doi.org/10.1109/isaf.1992.300639

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Publication Date: Aug 30, 1992

Affiliation: Lehigh University

#Off-center Ions #KTN Crystal + Show 8 more

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Abstract

A striking anomaly was observed in the behavior of KTN (KTa/sub 1-x/Nb/sub x/O/sub 3/), namely, the appearance of a remanent polarization well above T/sub c/. Hysteresis loops were measured at different frequencies in a 3% KTN crystal. The shape of the loop changed significantly with frequency, a behavior that is due to the slow relaxation of randomly distributed off-center Nb ions interacting in clusters. A model of this relaxation is developed, and hysteresis loops are calculated which are in good agreement with experiment. >

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