Fazli Akram
University of Ulsan
PiezoelectricityCrystal structureAnalytical chemistryCoercivityDielectricCeramicPiezoelectric coefficientComposite materialTetragonal crystal systemGrain sizeMaterials scienceScanning electron microscopeSinteringAtmospheric temperature rangeChemical engineeringPhase (matter)Curie temperatureFerroelectricityRelative densityQuenchingMicrostructure
25Publications
8H-index
151Citations
Publications 26
Newest
#1Muhammad Habib (Changwon National University)H-Index: 7
#2Muhammad Iqbal (UoP: University of Peshawar)H-Index: 3
Last. Tae Kwon Song (Changwon National University)H-Index: 38
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Abstract null null The structural evolution and the variation in the electrical properties of 0.67Bi1.03FeO3-0.33BaTi1-xZrxO3 (BF33BT-100xZr with x = 0.00–0.05) piezoelectric ceramics were studied. An enhanced static piezoelectric coefficient (d33) οf 248 pC/N, with a high Curie temperature (TC) of approximately 400 °C, was obtained near the morphotropic phase boundary (MPB). The room-temperature dynamic piezoelectric coefficient (d33*) was found to gradually increase from 460–620 pm/V as the te...
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#1Fazli Akram (UOU: University of Ulsan)H-Index: 8
#2Muhammad Sheeraz (UOU: University of Ulsan)H-Index: 5
Last. Chang Won Ahn (UOU: University of Ulsan)H-Index: 34
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Abstract In this study, lead-free zirconium (Zr)-modified Bi1/2(Na0.78K0.22)1/2TiO3 (BNKT) ceramics were synthesized by the conventional solid-state reaction method. The co-existence of two phases (tetragonal; P4mm and cubic phases; Pm 3 ¯ m) with definite phase fractions were observed for all samples. The lattice parameters were gradually enhanced by the addition of Zr-content in the BNKT ceramics, which strongly support the relaxor-ferroelectric response. All of the samples are well-dense with...
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#1Muhammad Sheeraz (UOU: University of Ulsan)H-Index: 5
#2Mamoon Ur Rashid (UOU: University of Ulsan)
Last. Tae Heon Kim (UOU: University of Ulsan)H-Index: 17
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Abstract We demonstrate the structural evolution of polymorphic phases in Al2O3-inserted SrMnO3 ceramics synthesized by solid state reaction. While the 4H-hexagonal phase is predominant in pure SrMnO3 ceramics, a small amount of 6H-hexagonal polymorph is identified in addition to the primary 4H-hexagonal SrMnO3 and the secondary hexagonal SrAl2O4 phases in the as-sintered ceramics, evidenced by x-ray diffraction and subsequent Rietveld refinement analyses. The existence of the 6H-hexagonal SrMnO...
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#2Nasir Ali (ZJU: Zhejiang University)
1 CitationsSource
#6Nasir Ali (ZJU: Zhejiang University)
Abstract Introducing multiple-ionic transport through a semiconductor-electrolyte is a promising approach to realize the low-temperature operation of SOFCs. Herein, we designed and synthesized a single-phase Ce-doped BaCo0.2Fe0.3-xTm0.1Zr0.3Y0.1O3-δ semiconductor-electrolyte possessing triple-charge (H+/O2−/e−) conduction ability. Two different compositions are synthesized: BaCo0.2Fe0.3-xCexTm0.1Zr0.3Y0.1O3-δ [x = 0.1–0.2]. The 20% doped Ce composition exhibits an outstanding oxide-ion and proto...
2 CitationsSource
#1Muhammad Habib (Changwon National University)H-Index: 7
#2Muhammad Bilal Munir (McMaster University)H-Index: 9
Last. Ali Hussain (Institute of Space Technology)H-Index: 21
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Abstract This article reports structural evolution and electromechanical properties of lead-free (1-x)(0.965Bi0.5Na0.5TiO3-0.035BaTiO3)-xSrTiO3 (BNTBT-100xST with x = 0.00−0.30) ceramics synthesized by sol-gel and hydrothermal methods. The crystal structure investigation shows a compositionally-driven phase transition from the dominant rhombohedral (R) phase to the tetragonal (T) phase. However, the physical properties revealed that BNTBT converts from normal ferroelectric to relaxor ferroelectr...
2 CitationsSource
#1Fazli AkramH-Index: 8
#2Muhammad Habib (Changwon National University)H-Index: 7
Last. Soonil Lee (Changwon National University)H-Index: 21
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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...
1 CitationsSource
#1Tauseef Ahmed (Changwon National University)H-Index: 2
#2Salman Ali Khan (Changwon National University)H-Index: 6
Last. Soonil Lee (Changwon National University)H-Index: 21
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Abstract Effect of Bi non-stoichiometry is one of the big issues in BiFeO3-BaTiO3 (BF-BT) ceramics that have not been resolved clearly. Therefore 0.65Bi1+xFeO3-0.35BaTiO3 (x = 0.00 - 0.06) ceramics were synthesized by a conventional solid-state reaction at different sintering temperatures (TS) to control the Bi non-stoichiometry, which can be varied by the sublimation and/or evaporation of Bi+3 ions during sintering process. The effect of Bi chemical pressure on crystalline phase, microstructure...
2 CitationsSource
#1Muhammad Habib (Changwon National University)H-Index: 7
#2Myang Hwan Lee (Changwon National University)H-Index: 13
Last. Tae Kwon Song (Changwon National University)H-Index: 38
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Abstract Temperature-insensitive high piezoelectric strain and low strain hysteresis (Hs) with high Curie temperature (TC) are desirable for piezoelectric actuator applications. The excellent room-temperature piezoelectric performance (d33 = 309 pC/N and d33* = 458 pm/V) with very high TC = 482 °C have achieved in 0.67Bi1.03FeO3-0.33Ba1-xLaxTiO3 ceramics. Furthermore, a small variation in the piezoelectric strain (ΔST = 13%) in the temperature range of 25 °C–125 °C with low strain hysteresis (Hs...
7 CitationsSource