Giant d 33 in nonstoichiometric (K,Na)NbO 3 -based lead-free ceramics

Zheng, Ting; Wu, Jiagang; Xiao, Dingquan; Zhu, Jianguo

doi:10.1016/j.scriptamat.2014.09.008

Cited by 70 publications

(48 citation statements)

References 26 publications

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“…[2][3][4] Up to present, a lot of research papers on KNNbased lead-free piezoelectric ceramics have been published, including the piezoelectric properties, [5][6][7] the energy-storage properties, 8 etc. In order to further improve the piezoelectric properties of KNN, engineering of the polymorphic phase transition (PPT) between tetragonal and orthorhombic phases, i.e., shifting downward the PPT point T OÀT to ambient temperature through chemical modifications, 9 has been employed, represented by the formation of pseudobinary solid solutions between KNN and one additional component, e.g., KNN-LiTaO 3 , 10-14 KNN-LiSbO 3 15-17 KNN-BiFeO 3 18 and so on.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric properties of (K0.5Na0.5)NbO₃-BaTiO₃lead-free ceramics prepared by spark plasma sintering

et al. 2016

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(K,Na)NbO 3 (KNN)-based lead-free piezoceramics have been the spotlight in search for practically viable candidates to replace the hazardous but dominating lead-containing counterparts. In this work, BaTiO 3 (BT) modified KNN ceramics were fabricated by spark plasma sintering (SPS) and the influence of BT content as well as sintering temperature on the phase structure, microstructure, and electrical properties were investigated. It was found that the 0.96(Na 0:5 K 0:5 ÞNbO 3 -0.04BaTiO 3 (BT4) ceramics sintered at 1000 C have the optimal performance. Additionally, in-depth analysis of the electrical hysteresis revealed that the internal bias field originating from accumulation of space charges at grain boundaries is responsible for the asymmetry in the hysteresis loops.

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Section: Introductionmentioning

confidence: 99%

Piezoelectric properties of (K0.5Na0.5)NbO₃-BaTiO₃lead-free ceramics prepared by spark plasma sintering

et al. 2016

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“…Previous researches mainly focus on volatile A‐site elements: K, Na, and Bi. For example, an enhanced piezoelectric property ( d 33 = 496 pC/N and k p = 47%) was observed in KNNS‐BNKZ ceramics with 0.5% excess of Na . Highest piezoelectric constant ( d 33 = 137 pC/N) was obtained in the BNBT ceramics with 1% excess of Bi .…”

Section: Introductionmentioning

confidence: 98%

Defect engineering electrical properties of lead‐free potassium sodium niobate‐based ceramics

Sun

Zheng

et al. 2019

J Am Ceram Soc

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Defect engineering plays an important role in property modification for piezoelectric materials. In this work, we pay much attention to the effect of Nb nonstoichiometry on structure and properties of typical 0.95(K0.45Na0.55)Nb1+xO3–0.05Bi0.5Na0.5HfO3 ceramics. Large piezoelectric constant (d33 ~ 425 pC/N and d33∗ ~482 pm/V) together with high Curie temperature (TC ~ 315°C) have been achieved in the ceramics with excess Nb content (x = 0.01). However, the ceramics with deficient Nb element have seriously suppressed cryogenic εr‐T curves and deteriorated electrical properties. Multi‐scale characterizations including phase structure, microstructure, defect structure and domain structure have been adopted to explain the corresponding phenomenon. Defect complex VNb″″′-VnormalO·· caused by deficient Nb induces clamped domain wall motion, leading to blocked polarization vector and poor electrical properties. On the contrary, the enhanced properties for the ceramics with excess Nb are attributed to easier domain switching due to the suppressed vacancies. We believe that defect engineering, for example nonstoichiometry, cannot only modulate electrical properties but also help us to understand some fundamental and critical problems about KNN‐based ceramics.

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“…Moreover, NKN‐based piezoelectric ceramics with tetragonal‐rhombohedral PPB structure were synthesized by simultaneously increasing the T O‐R to RT and decreasing the T O‐T to RT, inducing a tetragonal‐rhombohedral transition temperature ( T R‐T ) at RT . These NKN‐based ceramics exhibited large d 33 values because the tetragonal‐rhombohedral PPB structure is similar to the tetragonal‐rhombohedral morphotropic phase boundary (MPB) structure observed in PZT‐based ceramics . Recently, (Na,K)(Nb,Sb)O 3 ‐BiFeO 3 ‐BiNaZrO 3 ceramics, which have tetragonal‐rhombohedral PPB structure in their nanodomains, showed a large d 33 value of 550 pC/N .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, (Na,K)(Nb,Sb)O 3 ‐BiFeO 3 ‐BiNaZrO 3 ceramics, which have tetragonal‐rhombohedral PPB structure in their nanodomains, showed a large d 33 value of 550 pC/N . Therefore, many investigations have been performed to develop NKN‐based ceramics with tetragonal‐rhombohedral PPB structure through the formation of the T R‐T at RT …”

Section: Introductionmentioning

confidence: 99%

Piezoelectric properties of (Na_0.5K_0.5)(Nb_1‐_xSb_x)O₃‐SrTiO₃ ceramics with tetragonal‐pseudocubic PPB structure

et al. 2018

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CuO‐added 0.96(Na0.5K0.5)(Nb1‐xSbx)O3‐0.04SrTiO3 ceramics sintered at the low temperature of 960°C for 10 hours showed dense microstructures and high relative densities. The specimens with 0.0 ≤ x ≤ 0.04 had orthorhombic‐tetragonal polymorphic phase boundary (PPB) structure. Tetragonal‐pseudocubic PPB structure was observed in specimens with 0.05 ≤ x ≤ 0.07, while the specimen with x = 0.08 has a pseudocubic structure. The structural variation in the specimens is explained by the decreases in the orthorhombic‐tetragonal transition temperature and Curie temperature with the addition of Sb5+ ions. The specimens with 0.05 ≤ x ≤ 0.07, which have tetragonal‐pseudocubic PPB structure, had large electric field‐induced strains of 0.14%‐0.016%. Moreover, these specimens also showed increased d33 values between 280 pC/N and 358 pC/N. In particular, the specimen with x = 0.055 showed particularly enhanced piezoelectric properties: d33 of 358 pC/N, kp of 0.45, and the electric field‐induced strain of 0.16% at 4.5 kV/mm.

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Giant d 33 in nonstoichiometric (K,Na)NbO 3 -based lead-free ceramics

Cited by 70 publications

References 26 publications

Piezoelectric properties of (K0.5Na0.5)NbO₃-BaTiO₃lead-free ceramics prepared by spark plasma sintering

Piezoelectric properties of (K0.5Na0.5)NbO₃-BaTiO₃lead-free ceramics prepared by spark plasma sintering

Defect engineering electrical properties of lead‐free potassium sodium niobate‐based ceramics

Piezoelectric properties of (Na_0.5K_0.5)(Nb_1‐_xSb_x)O₃‐SrTiO₃ ceramics with tetragonal‐pseudocubic PPB structure

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Giant d 33 in nonstoichiometric (K,Na)NbO 3 -based lead-free ceramics

Cited by 70 publications

References 26 publications

Piezoelectric properties of (K0.5Na0.5)NbO3-BaTiO3lead-free ceramics prepared by spark plasma sintering

Piezoelectric properties of (K0.5Na0.5)NbO3-BaTiO3lead-free ceramics prepared by spark plasma sintering

Defect engineering electrical properties of lead‐free potassium sodium niobate‐based ceramics

Piezoelectric properties of (Na0.5K0.5)(Nb1‐xSbx)O3‐SrTiO3 ceramics with tetragonal‐pseudocubic PPB structure

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Piezoelectric properties of (K0.5Na0.5)NbO₃-BaTiO₃lead-free ceramics prepared by spark plasma sintering

Piezoelectric properties of (K0.5Na0.5)NbO₃-BaTiO₃lead-free ceramics prepared by spark plasma sintering

Piezoelectric properties of (Na_0.5K_0.5)(Nb_1‐_xSb_x)O₃‐SrTiO₃ ceramics with tetragonal‐pseudocubic PPB structure