Soon-Jong Jeong
Korea Electrotechnology Research Institute
PiezoelectricityComposite numberAnalytical chemistryDielectricCeramicPiezoelectric coefficientComposite materialPower (physics)VoltageActuatorElectrodeMaterials scienceMineralogyTape castingSinteringOptoelectronicsElectric fieldFerroelectricityElectromechanical coupling coefficientMicrostructureGrain growth
121Publications
14H-index
942Citations
Publications 123
Newest
#1Dong-Jin Shin (KERI: Korea Electrotechnology Research Institute)H-Index: 1
#5Min-Soo Kim (KERI: Korea Electrotechnology Research Institute)H-Index: 12
In this study, an acoustic emission (AE) sensor was fabricated using lead-free Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 (BZT–BCT) ceramics. The acoustic and electromechanical properties of the AE sensor were determined by the shapes of the piezoelectric ceramics. To optimize the AE sensor performance, the shapes of the ceramics were designed according to various diameter/thickness ratios (D/T) = 0.5, 1.0, 1.5, 2.0, 2.5, 3.0. The BZT–BCT ceramic with D/T = 1.0 exhibited excellent values of a piezoele...
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#1Fazli AkramH-Index: 9
#2Muhammad Habib (Changwon National University)H-Index: 5
Last. Soonil Lee (Changwon National University)H-Index: 23
view all 14 authors...
Lead-free piezoelectric ceramics, (Bi0.70Ba0.35)(Fe0.65Ti0.35)O3 (BBFT), were fabricated via a solid-state reaction method and then treated using different heat-treatment processes (furnace cooling, air quenching (AQ), and water quenching). In all these ceramics, the X-ray diffraction analysis revealed morphotropic phase boundaries between the rhombohedral and tetragonal phases. Changes in the average grain size, relative density, and electrical properties in the BBFT–AQ composition were observe...
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#1Soon-Jong Jeong (KERI: Korea Electrotechnology Research Institute)H-Index: 14
#2Dong-Hwan Lim (KERI: Korea Electrotechnology Research Institute)H-Index: 4
Last. Min-Soo Kim (KERI: Korea Electrotechnology Research Institute)H-Index: 12
view all 7 authors...
Abstract Relaxor-ferroelectric phase transition materials exhibit excellent strain behavior under applied electric fields for utilization in actuator applications. However, the large strain of relaxor-ferroelectric phase transition materials can only be achieved in a narrow temperature range. Hence, in this study, composition-based multilayer samples and compositional gradient composite (CGC) samples were designed and fabricated to extend the usable temperature range of relaxor-ferroelectric mat...
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#1Dong-Jin Shin (KERI: Korea Electrotechnology Research Institute)H-Index: 1
#2Dong-Hwan Lim (KERI: Korea Electrotechnology Research Institute)H-Index: 4
Last. Soon-Jong Jeong (KERI: Korea Electrotechnology Research Institute)H-Index: 14
view all 6 authors...
Abstract In this study, porous sandwich structures based on barium zirconate titanate–barium calcium titanate (BZT–BCT) ceramics are investigated for energy harvesting applications. To improve the piezoelectric energy harvesting performance, porous sandwich structures based on the BZT–BCT ceramics produced by the tape casting method are designed to be optimum materials with high piezoelectric charge coefficient and low dielectric constant. The dense and porous layer are made of BZT–BCT ceramic s...
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#1Bo-Kun Koo (KERI: Korea Electrotechnology Research Institute)H-Index: 5
#2Dong-Hwan Lim (KERI: Korea Electrotechnology Research Institute)H-Index: 4
Last. Soon-Jong Jeong (KERI: Korea Electrotechnology Research Institute)H-Index: 14
view all 6 authors...
Abstract This paper describes an investigation of the interface of a multilayer device consisting of a Pb-free ferroelectric material (Bi0.37Na0.37Sr0.26)TiO3 (BNST) and a base metal (Cu)-noble metal (Ag) mixture that were co-fired in air and a reducing atmosphere. The stability of the interface between CuAg inner electrode layer and the BNST ceramic layer was evaluated with regard to the Gibbs free energy using the Ellingham diagram and interdiffusion of the metallic electrode elements. The CuO...
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#1Dong-Jin Shin (CAU: Chung-Ang University)H-Index: 7
#2Jae-Hoon Ji (CAU: Chung-Ang University)H-Index: 6
Last. Jung-Hyuk Koh (CAU: Chung-Ang University)H-Index: 16
view all 6 authors...
Abstract Flexible piezoelectric energy harvesters (FPEHs) were fabricated by employing different types of composite materials based on lead-free piezoelectric nanoparticles (LPNPs) and polyvinylidene fluoride (PVDF) with floating electrodes. The floating electrode effects were analyzed through an experiment and simulation. Different types of LPNPs (BaTiO3, Ba(Zr0.04Ti0.96)O3 (BZT), 1-mol% Cu-doped BZT, Ba(Zr0.2Ti0.8)O3–50(Ba0.7Ca0.3)TiO3 (BZT–BCT), and 1-mol% Cu-doped BZT–BCT)/PVDF composite fil...
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#1Soon-Jong Jeong (KERI: Korea Electrotechnology Research Institute)H-Index: 14
#2Dong-Hwan Lim (KERI: Korea Electrotechnology Research Institute)H-Index: 4
Last. Min-Soo Kim (KERI: Korea Electrotechnology Research Institute)H-Index: 12
view all 5 authors...
Abstract The purpose of this study is fabricate a multilayer device consisting of a lead-free piezoelectric ceramic (Bi 0.37 Na 0.37 Sr 0.26 )TiO 3 (BNST) and a base/noble (CuAg) metal mixture inner electrode, of which fabrication process was performed in air. During the fabrication process in air, a special treatment was proposed in which Cu is transformed into CuO due to direct contact with oxygen. The CuO is then reverse–converted to Cu by reaction between the hydrogen and the oxygen. Before ...
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