Dielectric relaxation and charged domain walls in (K,Na)NbO3-based ferroelectric ceramics

Есин, А. А.; Аликин, Д. О.; Турыгин, А. П.; Abramov, A. S.; Hreščak, Jitka; Walker, Julian; Rojac, Tadej; Benčan, Andreja; Malič, Barbara; Kholkin, A. L.; Shur, V. Ya.

doi:10.1063/1.4975341

Cited by 47 publications

(24 citation statements)

References 42 publications

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“…It was reported that the piezoelectricity was enhanced by the increasing grain size and the construction of multi-phase 14 coexistence [32,39]. As compared in Table 2, the ceramics with x=0.03 show the superior electrical properties to those of other KNN-based ceramics with an AGS of 1-2 µm [32,[40][41][42][43]. Particularly, some of the other ceramics even possess the coexisting O-T or R-T phases [32,[40][41][42][43].…”

Section: Resultsmentioning

confidence: 99%

“…As compared in Table 2, the ceramics with x=0.03 show the superior electrical properties to those of other KNN-based ceramics with an AGS of 1-2 µm [32,[40][41][42][43]. Particularly, some of the other ceramics even possess the coexisting O-T or R-T phases [32,[40][41][42][43]. Therefore, the substitutions among different additives may provide more options for inducing the desired electrical properties.…”

Section: Resultsmentioning

confidence: 99%

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Reduced degree of phase coexistence in KNN-Based ceramics by competing additives

Zhang

2020

Journal of the European Ceramic Society

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This work reveals the role of Bi3+ in the controlling ability of (Bi0.5Ag0.5)ZrO3 to the phase structure of potassium sodium niobate based ceramics by introducing Ba2+. The substitution on (Bi0.5Ag0.5)2+ with Ba2+ results in the reduced degree of phase coexistence, accompanying the phase transition from coexisting orthorhombic-tetragonal (O-T) phases to an orthorhombic (O) phase, which is demonstrated by the systematic phase structure analysis and variations of electrical properties. The analysis reveals that the high electronegativity of Bi3+ results in the increased covalent bond character and then increases the stabilization of the T phase, leading to a decrease in orthorhombic-tetragonal phase transition temperature (TO-T). Therefore, this work not only compares the controlling ability of Ba2+ and (Bi0.5Ag0.5)2+ to TO-T but also reveals which and how elements cause the decreased TO-T, promoting the understanding of the effect of additives on the phase structure.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Reduced degree of phase coexistence in KNN-Based ceramics by competing additives

Zhang

2020

Journal of the European Ceramic Society

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“…22 Presently, high-resolution and scanning TEM techniques allow for observation of individual atomic displacements and, hence, give information about the internal CDW structure. With these techniques, CDWs were documented in single crystals of LiNbO 3 , 27 YMnO 3 , 28 and (Ca,Sr) 3 Ti 2 O 7 , 29,30 thin films of BiFeO 3 , 8,[31][32][33] PbTiO 3 , 34 and PZT, [35][36][37][38][39][40] and ceramics of BiFeO 3 , 41 (K,Na)NbO 3 , 42 TmMnO 3 , 43 and LuMnO 3 . 43 TEM techniques, supplemented by analyses of the energy losses of electrons (EELS) were employed recently to detect elemental components of the material in the vicinity of CDWs.…”

Section: Cdw Observationsmentioning

confidence: 99%

Physics and applications of charged domain walls

Bednyakov

Sturman

Sluka³

et al. 2018

npj Comput Mater

155

158

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The charged domain wall is an ultrathin (typically nanosized) interface between two domains; it carries bound charge owing to a change of normal component of spontaneous polarization on crossing the wall. In contrast to hetero-interfaces between different materials, charged domain walls (CDWs) can be created, displaced, erased, and recreated again in the bulk of a material. Screening of the bound charge with free carriers is often necessary for stability of CDWs, which can result in giant two-dimensional conductivity along the wall. Usually in nominally insulating ferroelectrics, the concentration of free carriers at the walls can approach metallic values. Thus, CDWs can be viewed as ultrathin reconfigurable strongly conductive sheets embedded into the bulk of an insulating material. This feature is highly attractive for future nanoelectronics. The last decade was marked by a surge of research interest in CDWs. It resulted in numerous breakthroughs in controllable and reproducible fabrication of CDWs in different materials, in investigation of CDW properties and charge compensation mechanisms, in discovery of light-induced effects, and, finally, in detection of giant two-dimensional conductivity. The present review is aiming at a concise presentation of the main physical ideas behind CDWs and a brief overview of the most important theoretical and experimental findings in the field.

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“…4 Sodium potassium niobate (Na, K) NbO 3 (KNN) is one of the prominent members of lead-free family, which has been studied extensively for past few decades because of its high Curie temperature, good electro-mechanical coupling effect and piezoelectric and ferroelectric properties. 5,6 With extensive research followed by a large number of scientific publications every year on KNN-based bulk ceramics, it is still very difficult to densify ceramics whose electrical properties could be reproduced, 7,8 thus hindering commercial realization. Retaining stoichiometry and high density has been the major issue related to successful fabrication of KNN ceramics, which is caused by the loss of volatile alkali species present at elevated temperatures during the fabrication process.…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

et al. 2017

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We have investigated the structure, dielectric and electrical properties of lead-free polycrystalline (Na 0:47 K 0:47 Li 0:06 ) NbO 3 ceramics as a function of temperature and frequency in order to understand the intrinsic contribution of grain/bulk and grain boundary effects toward the dielectric response as well as the electrical conduction mechanism in the samples fabricated by microwave sintering method. X-ray diffraction analysis exhibits perovskite structure with orthorhombic symmetry, which is well supported by the Raman spectroscopic analysis. A minor secondary impurity phase of tungsten bronze structure was observed for samples sintered at 1050 C, which gets weaker for samples sintered at 1150 C. Dielectric permittivity was enhanced by 50%, although there was a reduction in the dielectric loss by about 50% at Curie temperature (450 C) for samples sintered at 1150 C. Complex impedance spectroscopic analysis indicated non-Debye-type dielectric relaxation present in the samples, and this phenomenon followed thermally activated process related to hopping mechanism. Nyquist plot showed the negative temperature coefficient of resistance, characteristic of the samples.

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Dielectric relaxation and charged domain walls in (K,Na)NbO3-based ferroelectric ceramics

Abstract: We report on the evidence of significant contribution of charged domain walls to low frequency dielectric permittivity in KNN ferroelectric ceramics in the frequency range 10-10 6 Hz. The effect has been attributed to the Maxwell-Wagner-Sillars relaxation.

Cited by 47 publications

References 42 publications

Reduced degree of phase coexistence in KNN-Based ceramics by competing additives

Reduced degree of phase coexistence in KNN-Based ceramics by competing additives

Physics and applications of charged domain walls

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

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Dielectric relaxation and charged domain walls in (K,Na)NbO3-based ferroelectric ceramics

Abstract: We report on the evidence of significant contribution of charged domain walls to low frequency dielectric permittivity in KNN ferroelectric ceramics in the frequency range 10-10 6 Hz. The effect has been attributed to the Maxwell-Wagner-Sillars relaxation.

Cited by 47 publications

References 42 publications

Reduced degree of phase coexistence in KNN-Based ceramics by competing additives

Reduced degree of phase coexistence in KNN-Based ceramics by competing additives

Physics and applications of charged domain walls

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO3 ceramics

Contact Info

Product

Resources

About

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics