Morphotropic phase boundary and electrical properties of K1−xNaxNbO3 lead-free ceramics

Dai, Yejing; Zhang, Xiaowen; Chen, Kepi

doi:10.1063/1.3076105

Cited by 208 publications

(136 citation statements)

References 14 publications

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“…[1][2][3] A drawback of this class of materials is the occurrence of a polymorphic phase transition (PPT) around room temperature, which renders the piezoelectric properties very sensitive to temperature. To improve the general piezoelectric performance and the temperature stability of KNN ceramics, various attempts through manipulation of crystallographic structure 4,5 or refined processing techniques 6 have been published. Especially, CaZrO 3 and MnO 2 co-modified (K,Na,Li)(Nb,Ta)O 3 (CZ5) lead-free piezoceramics have high potential, since they show a large normalized strain d 33 * of 300-350 pm/V, which is extremely stable in the temperature range from room temperature up to 175 C. 7 However, practical applications demand not only outstanding piezoelectric properties but also the reliability and long term stability during cyclic electric loading to ensure successful industrial implementation.…”

mentioning

confidence: 99%

Fatigue-free unipolar strain behavior in CaZrO3 and MnO2 co-modified (K,Na)NbO3-based lead-free piezoceramics

Yao

Glaum

Wang

et al. 2013

Applied Physics Letters

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The unipolar fatigue behavior of CaZrO3 and MnO2 co-modified (K,Na,Li)(Nb,Ta)O3 lead-free piezoceramics was investigated systematically. The well-known charge agglomeration model is shown to explain the overall changes observed during unipolar fatigue, such as the development of bias field as well as the anisotropy in bipolar strain hysteresis and field-dependent dielectric permittivity. In addition, it is found that the unipolar strain exhibits only small degradation within 3% at the field amplitude of 2 kV/mm up to 107 cycles. This exceptionally good fatigue resistance is identified due to the presence of additional process, assigned as a “softening” effect that competes against the usual fatigue effect.

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mentioning

confidence: 99%

Fatigue-free unipolar strain behavior in CaZrO3 and MnO2 co-modified (K,Na)NbO3-based lead-free piezoceramics

Yao

Glaum

Wang

et al. 2013

Applied Physics Letters

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“…22 As x increases to 0.03, tetragonal phase appears. 23,24 Then, the structure changes to the tetragonal phase when x = 0.06. As 0.03 ≤ x ≤ 0.05, KNLNTS ceramics show coexistence of orthorhombic and tetragonal phase, indicating the presence of PPT region.…”

Section: Methodsmentioning

confidence: 99%

“…As 0.03 ≤ x ≤ 0.05, KNLNTS ceramics show coexistence of orthorhombic and tetragonal phase, indicating the presence of PPT region. [22][23][24][25][26] Therefore, the electrical properties of KNLNTS with varying Li content from 3 at. % (x = 0.03) to 6 at.…”

Section: Methodsmentioning

confidence: 99%

Investigation on transition behavior and electrical properties of (K0.5Na0.5)1-xLixNb0.84Ta0.1Sb0.06O3 around polymorphic phase transition region

et al. 2014

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(K0.5Na0.5)1-xLixNb0.84Ta0.1Sb0.06O3 (KNLNTS) lead free ceramics with different Li concentration were fabricated by conventional solid-state reaction method. By increasing Li ions in KNLNTS, the grains grow up and the crystal structure changes from orthorhombic to tetragonal. When 0.03 ≤ x ≤ 0.05, the ceramics structure lays in PPT region. Polarization versus electric field (P-E) hysteresis loops at room temperature show good ferroelectric properties and the remnant polarization decreases by increasing Li content while coercive electric keeps almost unchanged. In PPT region, taking x = 0.04 as an example, the sample shows excellent dielectric properties: the dielectric constant is 1159 and loss tangent is 0.04, while the piezoelectric constant d33 is 245 pC/N and kp is 0.44 at room temperature, it is promising for (K0.5Na0.5)1-xLixNb0.84Ta0.1Sb0.06O3 with 4 at. % Li to substitute PZT.

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“…It is well known that the most interesting compositions are located with K/Na ratio approximately equal to 1:1 [63][64][65], and the KNN ceramics mentioned hereafter refer to these compositions if no specific explanations provided. KNN ceramics have an orthorhombic structure with space group Amm2 at room temperature; however, it is a little complicated because it holds an orthorhombic structure while the perovskite type ABO 3 subcell possesses monoclinic symmetry [61].…”

Section: Polymorphism and Property Enhancementmentioning

confidence: 99%

(K,Na)NbO3-based Lead-free Piezoelectric Materials: An Encounter with Scanning Probe Microscopy

Zhang¹,

Thong²,

Lu³

et al. 2017

J. Korean Ceram. Soc

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Most widely used piezoelectric ceramics are based on Pb(Zr,Ti)O 3 (PZT) composition which has adverse environmental and health effects due to its high lead content. Environmental and safety concerns with respect to the utilization, recycling, and disposal of lead-based piezoelectric ceramics have induced a new surge in developing lead-free piezoelectric ceramics. Among all the lead-free ceramics, (K,Na)NbO 3 (KNN) has drawn increasing attention because of its well-balanced piezoelectric properties and better environmental compatibility. On basis of the author's work, this review summarizes the progress that has been made in recent years on development of KNN-based piezoelectric ceramics, including crystallographic structure and phase transition analysis, pressurized solid-state sintering as well as liquid-phase-assisted sintering process, and poling treatment for property enhancement. All in all, KNN is a promising lead-free system, but more research is still required both from academic and industrial interests.

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Morphotropic phase boundary and electrical properties of K1−xNaxNbO3 lead-free ceramics

Abstract: Articles you may be interested in Lead-free high-temperature dielectrics with wide operational range Phase structure, microstructure, and electrical properties of bismuth modified potassium-sodium niobium lead-free ceramics

Cited by 208 publications

References 14 publications

Fatigue-free unipolar strain behavior in CaZrO3 and MnO2 co-modified (K,Na)NbO3-based lead-free piezoceramics

Fatigue-free unipolar strain behavior in CaZrO3 and MnO2 co-modified (K,Na)NbO3-based lead-free piezoceramics

Investigation on transition behavior and electrical properties of (K0.5Na0.5)1-xLixNb0.84Ta0.1Sb0.06O3 around polymorphic phase transition region

(K,Na)NbO3-based Lead-free Piezoelectric Materials: An Encounter with Scanning Probe Microscopy

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