Coexistence of the relaxor-like and ferroelectric behavior in K1-xLixTaO3. (2nd August 2016)

• Record Type: Journal Article
• Authors: Trybuła, Z.; Dec, J.; Miga, S.; Łoś, Sz.; Trybuła, M.
• Is Part Of: Phase transitions. Volume 89:Number 7/8(2016)
• Page Start: 794
• Page End: 802
• Publication Date: 2016-08-02
• Subjects: Doped incipient ferroelectrics -- linear and nonlinear susceptibilities -- potassium tantalate -- ferroelectric phase transitions -- relaxors; Phase transformations (Statistical physics) -- Periodicals; 530.47405
• DOI: 10.1080/01411594.2016.1199801
• Languages: English
• ISSNs: 0141-1594

Abstract

ABSTRACT: The 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-x Lix TaO3, 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.