High densification and dielectric properties of lead-free (K0.5Na0.5)NbO3 piezoelectric ceramics with optimum excess Na2O and K2O contents

Sumang, Rattiphorn; Wicheanrat, Chamaiporn; Bongkarn, Theerachai; Maensiri, Santi

doi:10.1016/j.ceramint.2015.03.228

Cited by 15 publications

(2 citation statements)

References 20 publications

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“…This reduction may result from the evaporation of alkali elements which is commonly observed in sintering of KNN‐based ceramics. [ 74,75 ] On the other hand, a slight excess of Bi was observed in both single crystal and matrix. Some of the Bi 2 O 3 sintering aid may have entered the KNN–BNZS lattice.…”

Section: Resultsmentioning

confidence: 99%

Sintering Aid‐Assisted Growth of 0.95(K_0.5Na_0.5)NbO₃–0.05(Bi_0.5Na_0.5)(Zr_0.85Sn_0.15)O₃ Single Crystals by the Solid‐State Crystal Growth Method and Their Characterization

Uwiragiye

Pham

Fisher

et al. 2022

Physica Status Solidi (a)

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In this work, 0.95(K0.5Na0.5)NbO3–0.05(Bi0.5Na0.5)(Zr0.85Sn0.15)O3 (KNN–BNZS) lead‐free piezoelectric single crystals are grown by the solid‐state crystal growth (SSCG) method and their phase transitions and properties characterized. Addition of an appropriate amount of Li2CO3 and Bi2O3 sintering aids considerably promotes single‐crystal growth. Chemical composition of the single crystal is similar to the nominal composition with a slight deficiency in Na and K as evaluated by electron probe microanalysis (EPMA). X‐Ray diffraction (XRD), electrical property measurements, and temperature‐controlled Raman scattering reveal that the phase transition near room temperature is from a rhombohedral to an orthorhombic or tetragonal phase. Wide temperature range Raman scattering and dielectric properties consistently indicate transitions associated with the phase transformations or boundaries of a phase coexistence region and further details. Nontrivial frequency dependence of dielectric properties is successfully parameterized by capacitance relaxations described by Debye and Cole–Cole responses with special constant phase elements with fixed exponents of 0.5 (Warburg elements). High‐frequency dielectric constants and additional dielectric relaxations and dc relaxations are deconvoluted. The modeling parameters indicate the phase transition temperatures (or boundaries of the phase coexistence region) unambiguously. Polarization–electric field and bipolar strain–electric field hysteresis loops show that the single crystal is a classic lossy ferroelectric material.

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Section: Resultsmentioning

confidence: 99%

Sintering Aid‐Assisted Growth of 0.95(K_0.5Na_0.5)NbO₃–0.05(Bi_0.5Na_0.5)(Zr_0.85Sn_0.15)O₃ Single Crystals by the Solid‐State Crystal Growth Method and Their Characterization

Uwiragiye

Pham

Fisher

et al. 2022

Physica Status Solidi (a)

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“…[13][14][15] The utilization of various preparation methods have been considered as one of useful approaches to improve properties of KNN based ceramics, such as spray pyrolysis, 16 spark-plasma sintering (SPS), 17 hydrothermal synthesis, 18,19 tape casting, 13 ultrasonic irradiation. 21 Conventional solid state reaction method suits to scale manufacture because of simple technology, low cost, precise control and high reliability. 21 Conventional solid state reaction method suits to scale manufacture because of simple technology, low cost, precise control and high reliability.…”

Section: Introductionmentioning

confidence: 99%

Structure and electrical properties of (0.965 − x)(K_0.48Na_0.52)NbO₃–xBiGaO₃–0.035(Bi_0.5Na_0.5)ZrO₃ piezoelectric ceramics

et al. 2016

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0.965 À x)(K 0.48 Na 0.52 )NbO 3 -xBiGaO 3 -0.035(Bi 0.5 Na 0.5 )ZrO 3 [(0.965 À x)KNN-xBG-BNZ] lead-free piezoelectric ceramics were prepared using normal sintering for improving the piezoelectric properties and temperature stability of KNN-based ceramics. The effects of the BiGaO 3 (BG) content on their phase structure, microstructure, and piezoelectric properties were investigated. Orthorhombic-tetragonal phase coexistence has been found in the ceramics with the composition range of 0 # x # 0.001, and the coexistence of rhombohedral, orthorhombic and tetragonal phases at room temperature was obtained with 0.002 # x # 0.006. Then enhanced piezoelectric properties and a high Curie temperature (e.g., d 33 ¼ 312 pC N À1 , k p $ 44%, and T C $ 341 C) were observed. All the results show this system of potassium-sodium niobate-based ceramics demonstrates promising potential in practical applications.

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Effect of Firing Conditions on Phase Formation, Microstructure, and Electrical Properties of (K0.5Na0.5)(Nb0.7Ta0.3)O3 Ceramics Synthesized by Solid-State Combustion Method

Yotthuan

Charoonsuk

Vittayakorn

et al. 2020

Journal of Elec Materi

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High densification and dielectric properties of lead-free (K0.5Na0.5)NbO3 piezoelectric ceramics with optimum excess Na2O and K2O contents

Cited by 15 publications

References 20 publications

Sintering Aid‐Assisted Growth of 0.95(K_0.5Na_0.5)NbO₃–0.05(Bi_0.5Na_0.5)(Zr_0.85Sn_0.15)O₃ Single Crystals by the Solid‐State Crystal Growth Method and Their Characterization

Sintering Aid‐Assisted Growth of 0.95(K_0.5Na_0.5)NbO₃–0.05(Bi_0.5Na_0.5)(Zr_0.85Sn_0.15)O₃ Single Crystals by the Solid‐State Crystal Growth Method and Their Characterization

Structure and electrical properties of (0.965 − x)(K_0.48Na_0.52)NbO₃–xBiGaO₃–0.035(Bi_0.5Na_0.5)ZrO₃ piezoelectric ceramics

Effect of Firing Conditions on Phase Formation, Microstructure, and Electrical Properties of (K0.5Na0.5)(Nb0.7Ta0.3)O3 Ceramics Synthesized by Solid-State Combustion Method

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High densification and dielectric properties of lead-free (K0.5Na0.5)NbO3 piezoelectric ceramics with optimum excess Na2O and K2O contents

Cited by 15 publications

References 20 publications

Sintering Aid‐Assisted Growth of 0.95(K0.5Na0.5)NbO3–0.05(Bi0.5Na0.5)(Zr0.85Sn0.15)O3 Single Crystals by the Solid‐State Crystal Growth Method and Their Characterization

Sintering Aid‐Assisted Growth of 0.95(K0.5Na0.5)NbO3–0.05(Bi0.5Na0.5)(Zr0.85Sn0.15)O3 Single Crystals by the Solid‐State Crystal Growth Method and Their Characterization

Structure and electrical properties of (0.965 − x)(K0.48Na0.52)NbO3–xBiGaO3–0.035(Bi0.5Na0.5)ZrO3 piezoelectric ceramics

Effect of Firing Conditions on Phase Formation, Microstructure, and Electrical Properties of (K0.5Na0.5)(Nb0.7Ta0.3)O3 Ceramics Synthesized by Solid-State Combustion Method

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Sintering Aid‐Assisted Growth of 0.95(K_0.5Na_0.5)NbO₃–0.05(Bi_0.5Na_0.5)(Zr_0.85Sn_0.15)O₃ Single Crystals by the Solid‐State Crystal Growth Method and Their Characterization

Sintering Aid‐Assisted Growth of 0.95(K_0.5Na_0.5)NbO₃–0.05(Bi_0.5Na_0.5)(Zr_0.85Sn_0.15)O₃ Single Crystals by the Solid‐State Crystal Growth Method and Their Characterization

Structure and electrical properties of (0.965 − x)(K_0.48Na_0.52)NbO₃–xBiGaO₃–0.035(Bi_0.5Na_0.5)ZrO₃ piezoelectric ceramics