Effect of MnO2 on the Piezoelectric Properties of (1-x)(Na0.5K0.5)NbO3–xBaTiO3 Ceramics

Ahn, Cheol‐Woo; Song, Hyunwoo; Nahm, Sahn; Park, Seung-Ho; Uchino, Kenji; Priya, Shashank; Lee, Hyeung-Gyu; Kang, Nam-Kee

doi:10.1143/jjap.44.l1361

Cited by 99 publications

(39 citation statements)

References 12 publications

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“…The increase in k p with temperature should be attributed to the coexistence of the orthorhombic and tetragonal phases near T O-T , which is the major reason for the high piezoelectricity reported in KNN-based systems. [4][5][6][7][8][9][10] …”

Section: -3mentioning

confidence: 99%

Dielectric and piezoelectric properties of K0.5Na0.5NbO3–AgSbO3 lead-free ceramics

Lin

Kwok

Chan

2009

Journal of Applied Physics

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Lead-free piezoelectric ceramics ͑1−x͒K 0.5 Na 0.5 NbO 3 -xAgSbO 3 + 0.75 mol % MnO 2 were prepared by a conventional solid-state sintering technique, and the piezoelectric and dielectric properties of the ceramics were studied. The results of x-ray diffraction suggest that AgSbO 3 diffuses into the K 0.5 Na 0.5 NbO 3 lattices to form a new solid solution with a single-phase orthorhombic perovskite structure. After the addition of AgSbO 3 , the paraelectric cubic-ferroelectric tetragonal phase transition temperature ͑T C ͒ and the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperature ͑T O-T ͒ decrease, and the ceramics become "softened," resulting in significant improvements in the ferroelectric and piezoelectric properties. The ceramics with x = 0.03-0.10 exhibit excellent piezoelectric properties: d 33 = 130-216 pC/ N, k p = 0.44-0.51, and k t = 0.40-0.52. The ceramics also exhibit a good thermal stability up to high T O-T , suggesting that the ceramics are promising candidates for lead-free piezoelectric ceramics.

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Section: -3mentioning

confidence: 99%

Dielectric and piezoelectric properties of K0.5Na0.5NbO3–AgSbO3 lead-free ceramics

Lin

Kwok

Chan

2009

Journal of Applied Physics

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“…Therefore, there is a great need to develop lead-free piezoelectric ceramics with excellent piezoelectric properties for replacing the lead-containing ceramics in various applications. Several lead-free piezoelectric ceramics such as Bi 0.5 Na 0.5 TiO 3 -based materials, [1][2][3][4] Bi-layered structure materials, 5,6 tungsten bronze-type materials, 7 BaTiO 3 -based ceramics, 8 and alkaline niobatebased materials [9][10][11][12][13][14][15][16][17][18][19][20][21] have been extensively investigated. An important progress of grain-oriented alkaline niobate-based ceramics has been reported recently 22 and piezoelectric ceramics should be "lead-free at last."…”

Section: Introductionmentioning

confidence: 99%

“…10 However, there is a severe degradation in piezoelectric properties ͑d 33 =80 pC/N, k P = 36%͒ and density ͑ = 4.25 g / cm 3 ͒ for an air-fired KNN ceramics. 9,12 A number of studies have been carried out to improve the properties of KNN ceramics; these include the formation of solid solutions of KNN with other ferroelectrics or nonferroelectrics, e.g., KNN -LiNbO 3 , 13 KNN -BaTiO 3 , 16 KNN -SrTiO 3 , 14,15 KNN -LiTaO 3 , 24 and KNN-Li͑Nb, Ta, Sb͒O 3 , 22 as well as the use of sintering aids, e.g., K 5.4 Cu 1.3 Ta 10 O 29 . 18,19 On the basis of the reported work and the analogy of PZT-based ceramics, it is noted that the key approach for improving the piezoelectric properties of KNN-based ceramics is to lower the ferroelectric tetragonal-ferroelectric orthorhombic phase transition ͑T O-F ͒, forming coexistence of the tetragonal and orthorhombic phases at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Structure and electrical properties of K0.5Na0.5NbO3–LiSbO3 lead-free piezoelectric ceramics

Lin¹,

Kwok²,

Lam³

et al. 2007

Journal of Applied Physics

173

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Lead-free piezoelectric ceramics ͑1−x͒K 0.5 Na 0.5 NbO 3 -xLiSbO 3 have been fabricated by a conventional ceramic sintering technique. The results of x-ray diffraction suggest that Li + and Sb 5+ diffuse into the K 0.5 Na 0.5 NbO 3 lattices to form a solid solution with a perovskite structure. The ceramics can be well sintered at 1070-1110°C. The introduction of LiSbO 3 into the Na 0.5 K 0.5 NbO 3 solid solution decreases slightly the paraelectric cubic-ferroelectric tetragonal phase transition temperature ͑T c ͒, but greatly shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition ͑T O-F ͒ to room temperature. Coexistence of the orthorhombic and tetragonal phases is formed at 0.05Ͻ x Ͻ 0.07 at room temperature, leading to a significant enhancement of the piezoelectric properties. For the ceramic with x = 0.06, the piezoelectric properties become optimum: piezoelectric constant d 33 = 212 pC/ N, planar and thickness electromechanical coupling factors k P = 46% and k t = 47%, respectively, remanent polarization P r = 15.0 C/cm 2 , coercive field E c = 1.74 kV/ mm, and Curie temperature T C = 358°C.

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“…In order to improve the properties of BNT ceramics, new ͓Bi 0.5 ͑Na 1−x−y K x Li y ͒ 0.5 ͔TiO 3 lead-free piezoelectric ceramics were proposed. 11,12 The partial substitution of Na + by K + and Li + effectively decreases the coercive field of the ceramics, while the strong ferroelectricity is still maintained with good piezoelectric properties. With different dopants, ͑K,Na͒NbO 3 ͑KNN͒-based ceramics can be modified to form soft-and hard-type ceramics with reasonably good performance.…”

Section: Introductionmentioning

confidence: 99%

Lead-free acoustic emission sensors

Lam

Lin

Chan

2007

Review of Scientific Instruments

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Acoustic emission ͑AE͒ sensors have been fabricated using both soft-and hard-type lead-free ͑Na 0.5 K 0.5 ͒NbO 3 -based ceramics. The acoustic and electromechanical properties of the ceramics have been determined using the resonance technique. The lead-free AE sensors were calibrated using a laser source and compared to a commercial sensor. A lead zirconate titanate ͑PZT͒ 5H ceramics AE sensor has also been fabricated and calibrated for comparison. It was found that the sensitivity of lead-free AE sensors is comparable to that of the lead-based PZT sensor. To evaluate the sensors for potential application, they have been used in the detection of AE in an impact test. The lead-free sensors can reproduce AE signals accurately without giving artifacts and have potential use in commercial AE systems.

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Effect of MnO₂ on the Piezoelectric Properties of (1-x)(Na_0.5K_0.5)NbO₃–xBaTiO₃ Ceramics

Cited by 99 publications

References 12 publications

Dielectric and piezoelectric properties of K0.5Na0.5NbO3–AgSbO3 lead-free ceramics

Dielectric and piezoelectric properties of K0.5Na0.5NbO3–AgSbO3 lead-free ceramics

Structure and electrical properties of K0.5Na0.5NbO3–LiSbO3 lead-free piezoelectric ceramics

Lead-free acoustic emission sensors

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