Coexistence of the relaxor-like and ferroelectric behavior in K1-xLixTaO3 |
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| Authors: | Z Trybu?a J Dec S Miga Sz ?o? M Trybu?a |
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| Institution: | 1. Institute of Molecular Physics, Polish Academy of Science, Poznań, Polandtrybula@ifmpan.poznan.pl;3. Institute of Materials Science, Faculty of Computer Science and Materials Science, University of Silesia, Katowice, Poland;4. Institute of Molecular Physics, Polish Academy of Science, Poznań, Poland |
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| Abstract: | ABSTRACTThe results of low-temperature linear and nonlinear susceptibilities, polarization measurements and the dc electric field dependence of the dielectric properties of the lithium-doped potassium tantalate K1-xLixTaO3, x = 0.034 (KLT-3.4%Li) solid solution are presented. The coexistence of the relaxor-like and ferroelectric behavior and different mechanisms leading to either of them are discussed. The observed ferroelectric phase transition is of the first-order type with temperature hysteresis. This transition is due to the off-center motions of Ta ions in the octahedral environment of oxygen ions. Clusters of Li+ ions produce a relaxor-like behavior and random electric field. This field reduces the depolarization field and allows off-center motions of Ta ions and an appearance of spontaneous polarization. |
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| Keywords: | Doped incipient ferroelectrics linear and nonlinear susceptibilities potassium tantalate ferroelectric phase transitions relaxors |
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