Origin of the first-order ferroelectric phase transition in K0.957Li0.043TaO3 solid solution. (December 2016)

• Record Type: Journal Article
• Authors: Trybuła, Zbigniew; Dec, Jan; Miga, Seweryn; Łoś, Szymon; Trybuła, Małgorzata
• Is Part Of: Materials research bulletin. Volume 84(2016)
• Page Start: 298
• Page End: 302
• Publication Date: 2016-12
• Subjects: A. Oxides -- B. Lattice dynamics -- B. Phase transitions -- D. Dielectric properties -- D. Ferroelectricity -- D. Dielectrics; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2016.08.015
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: The first-order ferroelectric phase transition in K0.957 Li0.043 TaO3 was detected. A model of the mechanism of the ferroelectricity in K1−x Lix TaO3 is proposed. The coexistence of the relaxor-like and ferroelectric behavior is presented. Non-linear susceptibilities are valuable tools to investigate phase transitions. Abstract: The results of low-temperature linear and nonlinear susceptibilities and polarization measurements of the KLT-4.3%Li crystalline sample are presented. The following model of the mechanism of the ferroelectricity in the K0.957 Li0.043 TaO3 (KLT-4.3%Li) solid solution is proposed. Static quasi-frozen clusters of Li + dipoles affect the ordering process of the remainder of the system: a dynamical correlation of the off-center motions of Ta ions along one of the equivalent off-center sites in the 〈111〉 cubic direction in the octahedral environment of O ions occurs and leads to the formation of a reversible spontaneous polarization.