Title :
Polarization switching and long-time relaxation effects induced by off-center ions in KTa1-xNbxO3
Author :
Knauss, L.A. ; Jaquays, C. ; Adhikari, P. ; Vugmeister, B.E. ; Toulouse, J.
Author_Institution :
Dept. of Phys., Lehigh Univ., Bethlehem, PA, USA
fDate :
30 Aug-2 Sep 1992
Abstract :
A striking anomaly was observed in the behavior of KTN (KTa1-xNbxO3), namely, the appearance of a remanent polarization well above Tc. 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
Keywords :
dielectric hysteresis; dielectric polarisation; dielectric relaxation; ferroelectric materials; potassium compounds; KTN crystal; KTa1-xNbxO3; clusters; frequencies; hysteresis loops; long-time relaxation effects; polarization switching; randomly distributed off-center Nb ions; remanent polarization; shape; Capacitors; Circuits; Frequency dependence; Hysteresis; Lattices; Metastasis; Niobium; Optical polarization; Resistors; Temperature;
Conference_Titel :
Applications of Ferroelectrics, 1992. ISAF '92., Proceedings of the Eighth IEEE International Symposium on
Conference_Location :
Greenville, SC
Print_ISBN :
0-7803-0465-9
DOI :
10.1109/ISAF.1992.300639
