High-performance (K,Na)NbO3-based binary lead-free piezoelectric ceramics modified with acceptor metal oxide

Mahdi, R.I.; Al-Bahnam, Nabil Janan; Ajeel, Mohammed A.; Al‐Keisy, Amar; Hussein, Thulfiqar Ali; Majid, W.H. Abd.

doi:10.1016/j.ceramint.2020.05.287

Cited by 30 publications

(7 citation statements)

References 83 publications

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“…The lowest d 33 value stands for K6N4_200_30 at all frequencies tested, having K 0.22 Na 0.78 NbO 3 composition ( Figure 14 B). Additionally, the piezoelectric constant depends on the ceramic morphostructure, with implication for material density after shaping and sintering, the highest relative density leading to the highest d 33 value [ 68 ].…”

Section: Resultsmentioning

confidence: 99%

Alkali Niobate Powder Synthesis Using an Emerging Microwave-Assisted Hydrothermal Method

et al. 2022

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For more than five decades, alkali niobate-based materials (KxNa1-xNbO3) have been one of the most promising lead-free piezoelectric materials researched to be used in electronics, photocatalysis, energy storage/conversion and medical applications, due to their important health and environmentally friendly nature. In this paper, our strategy was to synthetize the nearest reproductible composition to KxNa1-xNbO3 (KNN) with x = 0.5, placed at the limit of the morphotropic phase boundary (MPB) with the presence of both polymorphic phases, orthorhombic and tetragonal. The wet synthesis route was chosen to make the mix crystal powders, starting with the suspension preparation of Nb2O5 powder and KOH and NaOH alkaline solutions. Hydrothermal microwave-assisted maturation (HTMW), following the parameter variation T = 200–250 °C, p = 47–60 bar and dwelling time of 30–90 min, was performed. All powders therefore synthesized were entirely KxN1−xNbO3 solid solutions with x = 0.06–0.69, and the compositional, elemental, structural and morphological characterization highlighted polycrystalline particle assemblage with cubic and prismatic morphology, with sizes between 0.28 nm and 2.95 μm and polymorphic O-T phase coexistence, and a d33 piezoelectric constant under 1 pC/N of the compacted unsintered and unpoled discs were found.

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Section: Resultsmentioning

confidence: 99%

Alkali Niobate Powder Synthesis Using an Emerging Microwave-Assisted Hydrothermal Method

et al. 2022

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“…The B-site ion is eccentrically displaced, and the corresponding unit cell parameters are changed, thereby generating local strain in Mn: KNN crystals. 17,55 High-Resolution Transmission electron microscope (HRTEM) imaging can obtain clear microscopic atomic arrangement, as shown in Fig. 6(a).…”

Section: The Local Distributions Of Strain Fields Induced By the Cgmentioning

confidence: 99%

“…15 The piezoelectric properties (B330 pC N À1 ) were improved by designing multilayer structured graded KNN composite ceramics, while maintaining temperature stability (25-100 1C). 16 At present, the methods for regulating the piezoelectric properties are generally as follows: ion doping, [17][18][19] phase boundary engineering, [20][21][22][23] optimized composition design, [24][25][26] and preparation technology. [27][28][29] In particular, potassium sodium niobate ((K, Na)NbO 3 , KNN) based ceramics play an important role in lead-free piezoelectric materials owing to their high Curie temperature (4400 1C) and excellent piezoelectric properties (B550 pC N À1 ).…”

Section: Introductionmentioning

confidence: 99%

Effect of composition gradient on domain structure and piezoelectric properties in Mn-doped KNN single crystals

Zhang

Wang

et al. 2023

J. Mater. Chem. C

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“…A polymorphic/morphotropic phase boundary (PPB/MPB) was introduced to improve the piezoelectric performance of KNN. 11–13 The phase boundaries can stabilize multiphase coexistence, enabling easy polarization rotation and low domain wall energy, thereby improving piezoelectricity. However, this boundary engineering has limitations in terms of thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal stability by short-range ordered ferroelectricity in K_0.5Na_0.5NbO₃-based piezoelectric oxides

Hwang

Lee

et al. 2023

Mater. Horiz.

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High-performance (K,Na)NbO3-based binary lead-free piezoelectric ceramics modified with acceptor metal oxide

Cited by 30 publications

References 83 publications

Alkali Niobate Powder Synthesis Using an Emerging Microwave-Assisted Hydrothermal Method

Alkali Niobate Powder Synthesis Using an Emerging Microwave-Assisted Hydrothermal Method

Effect of composition gradient on domain structure and piezoelectric properties in Mn-doped KNN single crystals

Enhanced thermal stability by short-range ordered ferroelectricity in K_0.5Na_0.5NbO₃-based piezoelectric oxides

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High-performance (K,Na)NbO3-based binary lead-free piezoelectric ceramics modified with acceptor metal oxide

Cited by 30 publications

References 83 publications

Alkali Niobate Powder Synthesis Using an Emerging Microwave-Assisted Hydrothermal Method

Alkali Niobate Powder Synthesis Using an Emerging Microwave-Assisted Hydrothermal Method

Effect of composition gradient on domain structure and piezoelectric properties in Mn-doped KNN single crystals

Enhanced thermal stability by short-range ordered ferroelectricity in K0.5Na0.5NbO3-based piezoelectric oxides

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Enhanced thermal stability by short-range ordered ferroelectricity in K_0.5Na_0.5NbO₃-based piezoelectric oxides