Structural and electrical properties of K-doped Sr 1.85 Ca 0.15 NaNb 5 O 15 lead-free piezoelectric ceramics

Yin, R.Q.; Zheng, Peng; Wang, J.C.; Dai, Bowen; Zheng, Li Mei; Du, Juan; Liang, Zheng; Deng, Jiang; Song, Kai; Qin, Hui

doi:10.1016/j.ceramint.2016.03.159

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…For example, in the KLN system, a TTB single crystal study has reported values of piezoelectric coefficient d 33 equal to 52 pC/N and ferroelectric polarization Pr of 25-30 µC/cm² [22]. Piezoelectric coefficients d 33 were measured reaching 190 pC/N and 114 pC/N, for MnO 2 -doped and K-doped TTB ceramics in the Sr-Ca-Na-Nb-O system, respectively [23,24]. In the Sr-Ba-Na-Nb-O system, the TTB phase exhibits a relative permittivity as high as 1600 at 1 kHz [25].…”

Section: Introductionmentioning

confidence: 99%

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Aspe

Demange

Waroquet

et al. 2020

Journal of Alloys and Compounds

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Pulsed laser deposition parameters have been determined to synthesize pure Tetragonal Tungsten Bronze (TTB) phase thin films in the (K , Na)-Nb-O system (KNN). In relation to the high volatility of alkaline elements, it was found that the target composition and the targetsubstrate distance are of first importance. The TTB phase was identified by X-ray and electron diffraction and the surface microstructure consisting mainly of nanorods supports the formation of hallmark of the TTB phase. Poly-oriented nanorods have been obtained on both C-plane sapphire and (111)Pt/TiO 2 /SiO 2 /(001)Si substrates whereas horizontal nanorods oriented along the (hk0) planes have been grown on (100) and (110) SrTiO 3. All the nanorods are parallel together when grown on (110) SrTiO 3 and they present two in-plane orientations rotated of 90° from each other on (100) SrTiO 3. Dielectric characteristics (dielectric permittivity ε r , and loss tangent tanδ) have been measured at low (1 kHz-1 MHz) and high (1 GHz-40 GHz) frequencies, on films deposited on Pt coated silicon and sapphire, respectively. A value of ε r = 200 at 1 kHz with tanδ = 0.015 were measured in a parallel plate capacitor configuration, whereas ε r = 130 and tanδ = 0.20 at 10 GHz were retrieved from transmission lines printed on the KNN TTB thin film grown on C-plane sapphire. Raman investigations of the TTB films were performed in the temperature range 77-873 K, confirming the TTB phase formation and the absence of structural transition. Piezoelectric Force Microscopy measurements evidenced a piezoelectric signal although no switching could be performed. However the dielectric measurements, complicated by high leakage currents when a DC voltage was applied, did not evidence any proof of ferroelectricity for the undoped KNN TTB films whereas results reported on other niobates (A,A') 0.6 Nb 10 O 30 (with A: K, Na and A': Sr, Ba, Ca) have shown Curie temperatures, lying between 156°C and 560°C, separating the paraelectric phase (space group: P4/mbm N°127) and the ferroelectric one (space group: P4bm N°100).

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Section: Introductionmentioning

confidence: 99%

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Aspe

Demange

Waroquet

et al. 2020

Journal of Alloys and Compounds

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“…If the A-sites are not completely occupied, the structure is referred to as being 'unfilled'. Sr 2−x Ca x NaNb 5 O 15 (SCNN, 0.05 < x < 0.35) ceramics with a 'filled' TB structure have shown potential as lead-free piezoelectric materials [10][11][12]. SCNN single crystals with large piezoelectric constants at x = 0.1 have been reported [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Electrical and transparent properties induced by structural modulation in (Sr0.925Ca0.075)2.5–0.5Na Nb5O15 ceramics

Yang

Hao

et al. 2017

Journal of the European Ceramic Society

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The effects of Na + concentration on the microstructural, dielectric, ferroelectric and transparent properties of (Sr 0.925 Ca 0.075) 2.5−0.5x Na x Nb 5 O 15 (SCNN; 0.4 ≤ x ≤ 1.0) ceramics prepared using a conventional solid-state reaction method were investigated. X-ray diffraction results showed that the phase structure transitioned from tetragonal to orthorhombic tungsten bronze along with the structural type changing from 'unfilled' to 'filled' state. The NbO 6 octahedron became more distorted and had higher interaction strength when introducing Na + in A-sites to decrease the structural vacancies, leading to the improvement of dielectric and ferroelectric properties. The dielectric spectra of all specimens showed two broad dielectric anomalies: a hightemperature anomaly (the ferroelectric phase transition) and a low-temperature anomaly caused by the subtle structural effects in 'unfilled' SCNN ceramics, which evolved into the ferroelastic phase transition in 'filled' SCNN ceramics.

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Enhanced energy storage properties in Sr1.85Ca0.15NaNb5O15-based tungsten bronze ceramics through multicomponent substitution

Feng

et al. 2023

J Mater Sci: Mater Electron

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Structural and electrical properties of K-doped Sr 1.85 Ca 0.15 NaNb 5 O 15 lead-free piezoelectric ceramics

Cited by 9 publications

References 25 publications

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Electrical and transparent properties induced by structural modulation in (Sr0.925Ca0.075)2.5–0.5Na Nb5O15 ceramics

Enhanced energy storage properties in Sr1.85Ca0.15NaNb5O15-based tungsten bronze ceramics through multicomponent substitution

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