Application of [001]-textured (K, Na)(Nb, Sb)O3-CaZrO3 thick films to piezoelectric energy harvesters

Chae, Seok‐June; Na, Ji-won; Kim, Dae-Su; Kim, Sun-Woo; Go, Su‐Hwan; Kim, Hero; Kim, Young Ho; Eum, Jae‐Min; Nahm, Sahn

doi:10.1016/j.ceramint.2022.03.109

Cited by 14 publications

(5 citation statements)

References 63 publications

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“…The enhancement in the piezoelectric properties of the [001]-textured KNN-modified ceramics was influenced by their crystal structure. Therefore, the piezoelectric properties of [001]-textured KNN-based ceramics with various structures were investigated [ 81 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 ]. The 0.99(K 0.49 Na 0.49 Li 0.02 )(Nb 0.97−x Sb 0.03 Ta x )O 3 -0.01CaZrO 3 [KNL(N 0.97−x ST x )-CZ] ceramics (0.03 ≤ x ≤ 0.25) were textured along the [001] direction using 3.0% NaNbO 3 (NN) templates using a two-step sintering process [ 113 ].…”

Section: [001]-textured Knn-based Lead-free Piezoceramicsmentioning

confidence: 99%

“…Further, the large d33 value (≥580 pC/N) was preserved up to 110 °C, as provided in Figure 17d. Moreover, the [001]-textured KN(Nb0.91S0.09)-CaZrO3 ceramic also showed an ideal O-R (or O-PC) multistructure composed of the Amm2 O (59%) and the R3m R (41%) structures [114]. This ceramic exhibited a large d33 value of 610 pC/N; therefore, the KN(Nb1−ySy)-MZ ceramics (M = Sr and Ca) with an ideal O-PC (or O-R) multistructure exhibited a large d33 value of 610-620 pC/N.…”

Section: (Or O-r) Multistructurementioning

confidence: 99%

“…A traditional tape-casting method has been employed to fabricate the textured KNN-based piezoceramics. The piezoelectric properties of the [001]-textured KNN-related piezoceramics are improved because their microstructures are alike those of [001]-oriented single crystals [ 113 , 114 , 115 ]. The enhancement in piezoelectricity after [001] texturing is largely affected by the crystal structure of the ceramics, and therefore, the relationship between crystal structure and piezoelectricity enhancement has also been investigated [ 116 , 117 , 118 , 119 ].…”

Section: Introductionmentioning

confidence: 99%

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Recent Developments in (K, Na)NbO3-Based Lead-Free Piezoceramics

Lee,

Kim,

Kim

et al. 2024

Micromachines

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(K0.5Na0.5)NbO3 (KNN)-based ceramics have been extensively investigated as replacements for Pb(Zr, Ti)O3-based ceramics. KNN-based ceramics exhibit an orthorhombic structure at room temperature and a rhombohedral–orthorhombic (R–O) phase transition temperature (TR–O), orthorhombic–tetragonal (O–T) phase transition temperature (TO–T), and Curie temperature of −110, 190, and 420 °C, respectively. Forming KNN-based ceramics with a multistructure that can assist in domain rotation is one technique for enhancing their piezoelectric properties. This review investigates and introduces KNN-based ceramics with various multistructures. A reactive-templated grain growth method that aligns the grains of piezoceramics in a specific orientation is another approach for improving the piezoelectric properties of KNN-modified ceramics. The piezoelectric properties of the [001]-textured KNN-based ceramics are improved because their microstructures are similar to those of the [001]-oriented single crystals. The improvement in the piezoelectric properties after [001] texturing is largely influenced by the crystal structure of the textured ceramics. In this review, [001]-textured KNN-based ceramics with different crystal structures are investigated and systematically summarized.

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Section: [001]-textured Knn-based Lead-free Piezoceramicsmentioning

confidence: 99%

Section: (Or O-r) Multistructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent Developments in (K, Na)NbO3-Based Lead-Free Piezoceramics

Lee,

Kim,

Kim

et al. 2024

Micromachines

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“…14 Textured KNN piezoceramics, like any other ceramics, have brittle nature, which further imposes challenges in their implementation for PEH. 22 Thus, in addition to material innovation, a new architectural design is also needed to ensure their reliability in PEH.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Due to the presence of polymorphic phase transition (PPT) in the KNN system, there is a narrow window for optimization of the thermal stability and electromechanical constants in KNN compositions . Textured KNN piezoceramics, like any other ceramics, have brittle nature, which further imposes challenges in their implementation for PEH . Thus, in addition to material innovation, a new architectural design is also needed to ensure their reliability in PEH.…”

Section: Introductionmentioning

confidence: 99%

Textured Lead-Free Piezoelectric Ceramics for Flexible Energy Harvesters

Purusothaman

Leng

Nanda

et al. 2023

ACS Appl. Mater. Interfaces

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A lead-free (K,Na)NbO3-based piezoelectric ceramic is textured along the (001) direction using the NaNbO3 (NN) seeds. The composition 0.96(K0.5Na0.5)(Nb0.965Sb0.035)O3–0.01CaZrO3–0.03(Bi0.5K0.5)HfO3 (KNN) is found to provide an excellent combination of electromechanical coefficients at room temperature. The textured composition with 5 wt % NN template (KNN-5NN) exhibits considerably improved electromechanical coefficients, d 33 ∼ 590 pC/N, k 31 ∼ 0.46, and d 31 ∼ 215 ×10–12 C/N, at room temperature. A flexible piezoelectric energy harvester (F-PEH) is fabricated using the textured KNN-5NN ceramic and tested under cyclic force. F-PEH exhibits enhanced output voltage (V oc ∼ 25 V), current (I ∼ 0.4 μA), and power density (P D ∼ 5.5 mW/m2) (R L of 10 MΩ) in the off-resonance frequency regime. In comparison to the random ceramic KNN-0NN-based F-PEH (V oc ∼ 8 V and I ∼ 0.1 μA), the textured F-PEH significantly outperformed energy harvesting capability due to the large figure-of-merit value (d 31 × g 31) ∼ 3354 ×10–15 m3/J. This work provides a methodology for texturing lead-free materials and further implementing them in flexible energy harvesting devices and sensors.

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