Ferroelectric domain structures and phase transitions in KTa1−xNbxO3 crystals

Huang, Xinyan; Jiang, Sai; Xu, X. Y.; Wang, J. Y.; Guan, Qingcai; Jiang, Jianhua; Ding, Feng

doi:10.1002/pssa.2211480230

Cited by 7 publications

(6 citation statements)

References 12 publications

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“…Further it is possible to show that these are the only domain walls that are possible in the orthorhombic phase. This is shown schematically in ®gure 5 and is in agreement with observations (Jona and Shirane 1962, Huang et al 1995).…”

Section: …I †ˆ1supporting

confidence: 90%

Domain patterns and macroscopic behaviour of ferroelectric materials

Shu¹

2001

Philosophical Magazine B

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This paper examines the domain patterns and the macroscopic behaviour of single crystals of ferroelectric material using a theory based on energy minimization. A low-energy path is identi®ed for domain switching and a novel con®guration that yields very large electrostriction is identi®ed. } 1. Introduction Ferroelectric crystals are widely used in a variety of applications including transducers, capacitors and non-volatile data storage elements. In particular, poled ceramics of ferroelectric materials are used commonly for their piezoelectric property in actuator applications (Huber et al. 1997, Uchino 1998. Their many advantages include a linear response of the induced strain to applied electric ®eld, very little hysteresis and very-high frequency response. The strains and displacements that they display, however, are quite small. An improvement in the strain level would lead to an explosion of the applications of these materials as miniature solid-state actuators and sensors in a variety of structural applications. It has recently been recognized that it is possible to obtain large strains through electrostriction in single crystals (Shrout and Park 1997).Ferroelectric crystals are non-polar above the Curie temperature but are spontaneously polarized with a spontaneous lattice distortion below the Curie temperature. The interesting properties of ferroelectrics arise from the fact that it is possible to change the polarization and distortion through applied electric ®eld or mechanical stress. Further, there is typically a reduction in crystallographi c symmetry at the Curie temperature and this creates more than one symmetry-related , spontaneousl y polarized and distorted state below this temperature. The di erent states can coexist as`domains' in very intricate and characteristic domain patterns (for example

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Section: …I †ˆ1supporting

confidence: 90%

Domain patterns and macroscopic behaviour of ferroelectric materials

Shu¹

2001

Philosophical Magazine B

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“…Similar observations have been made for other materials: Huang et al studied the domain evolution during the O-T transition in KTa 0.25 Nb 0.75 O 3 by polarization microscopy [306] and found conserved orientations of initial T90 walls transforming to O60 walls and both O60 to T90 transitions and 'healing' of domains at the back transition under heating, see figure 11(c). They furthermore found a dependence of the phase transition on the sample thickness.…”

Section: Ferroelectric To Ferroelectric Phase Transitionssupporting

confidence: 76%

“…It is common belief that the formation of nuclei in the homogeneous medium (homogeneous or intrinsic nucleation) is not the most frequent mechanism in real materials as the energy for nucleation may be reduced locally (heterogeneous or extrinsic nucleation) at (1) point defects [304,305], (2) concentration inhomogeneities in solid solutions [306], (3) electrodes [307,308] (4) surfaces and defects at surfaces [303], (5) dislocations, cracks, pores and other defects, (6) domain walls [240,286] (in case of field-induced switching and FE-FE transitions) which are typically centers of excess charges, stress accumulation, modified energy landscapes, and frustrations [309]. The nucleation barrier may thus be locally reduced [272,273,310], and depends on the materials' defect structure and the boundary conditions.…”

Section: Nucleation and Propagation Of Ferroelectric Phases And Domainsmentioning

confidence: 99%

Interplay of domain structure and phase transitions: theory, experiment and functionality

Grünebohm¹,

Marathe²,

Khachaturyan³

et al. 2021

J. Phys.: Condens. Matter

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Domain walls and phase boundaries are fundamental ingredients of ferroelectrics and strongly influence their functional properties. Although both interfaces have been studied for decades, often only a phenomenological macroscopic understanding has been established. The recent developments in experiments and theory allow to address the relevant time and length scales and revisit nucleation, phase propagation and the coupling of domains and phase transitions. This review attempts to specify regularities of domain formation and evolution at ferroelectric transitions and give an overview on unusual polar topological structures that appear as transient states and at the nanoscale. We survey the benefits, validity, and limitations of experimental tools as well as simulation methods to study phase and domain interfaces. We focus on the recent success of these tools in joint scale-bridging studies to solve long lasting puzzles in the field and give an outlook on recent trends in superlattices.

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“…1(d) [15]. While domains in KTN can be directly observed using transmission polarization microscopy in thin plates [33], periodic domain patterns in the volume can be optically detected using coherent scattering, as originally demonstrated in KTN by Bouziane et al [34]. We note that the patterns occur spontaneously, i.e., without fabrication or post-processing protocols (such as laser-induced domain pattern orientation), on cooling through T C .…”

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confidence: 66%