Structural, microstructural and electrical properties evolution of (K,Na,Li)(Nb,Ta,Sb)O3 lead-free piezoceramics through NiO doping

Rubio-Marcos, Fernando; Marchet, Pascal; Romero, J.J.; Fernández, J.F.

doi:10.1016/j.jeurceramsoc.2011.05.041

Cited by 44 publications

(31 citation statements)

References 36 publications

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“…Furthermore, it has been suggested that NiO 5 is often associated with viscous flow and chemical diffusion characteristic of silicate melts . In the sintering of (K,Na,Li)(Nb,Ta,Sb)O 3 ceramics, it has been well recognized that NiO can greatly promote the densification of their ceramics by the formation of a liquid phase during the sintering process . If the above features of NiO are accepted even in LNS glass, the effect of NiO additions on the thermal stability (DTA patterns in Figure ) and crystallization behavior (XRD patterns in Figure ) might be explained reasonably.…”

Section: Resultsmentioning

confidence: 99%

Laser patterning of oriented LiNbO₃ crystal particle arrays in NiO‐doped lithium niobium silicate glasses

Shimada

Honma

Komatsu

2018

Int J of Appl Glass Sci

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The patterning of LiNbO3 crystals was carried out at the surface of NiO‐doped 40Li2O‐32Nb2O5‐28SiO2 (LNS) glasses using continuous‐wave Yb:YVO4 fiber laser (wavelength: 1080 nm) to gain a deeper understanding of the crystal growth in the laser‐induced crystallization in glasses. It was suggested that in the conventional crystallization in an electric furnace, NiO acts as a nucleation agent in the LNS glass and the addition of NiO suppresses the c‐axis orientation of LiNbO3 at the glass surface. It was found from birefringence image observations that LiNbO3 crystals with a dot shape have a radial orientation from the center to the edge parts. Highly c‐axis oriented LiNbO3 crystal particle (diameter: 7‐11 μm) arrays were patterned along the laser scanning direction in laser irradiations (scanning mode: eg, the laser power of 1.60 W and scanning speeds of 7‐10 μm/s) in 3 mol% NiO‐doped LNS glass. It was suggested that the nucleation and crystal growth of LiNbO3 crystals are taking place repeatedly (periodically) along the laser scanning direction, consequently providing LiNbO3 crystal particle arrays.

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Section: Resultsmentioning

confidence: 99%

Laser patterning of oriented LiNbO₃ crystal particle arrays in NiO‐doped lithium niobium silicate glasses

Shimada

Honma

Komatsu

2018

Int J of Appl Glass Sci

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“…17 For KNN-based ceramics, the main Raman vibrations stem from the NbO 6 octahedron. 18 Furthermore, the A 1 g (m 1 ) mode represents a double-degenerate symmetric O-Nb-O stretching vibration, which is widely used to determine phase transitions. 18 Furthermore, the A 1 g (m 1 ) mode represents a double-degenerate symmetric O-Nb-O stretching vibration, which is widely used to determine phase transitions.…”

Section: Resultsmentioning

confidence: 99%

“…18 The NbO 6 vibrations include six modes, 1A 1g (m 1 ) + 1E g (m 2 ) + 2F 1u (m 3 ,m 4 ) + F 2 g (m 5 ) + F 2u (m 6 ), where 1A 1 g (m 1 ) + 1E g (m 2 ) + 1F 1u (m 3 ) are stretching modes and the rest are bending modes. 18 Furthermore, the A 1 g (m 1 ) mode represents a double-degenerate symmetric O-Nb-O stretching vibration, which is widely used to determine phase transitions. 18 Figure S5 shows the Raman spectra as a function of temperature for the ceramics with x = 0.03.…”

Section: Resultsmentioning

confidence: 99%

Structural evolution of the R‐T phase boundary in KNN‐based ceramics

Xiao

et al. 2017

J Am Ceram Soc

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Although a rhombohedral‐tetragonal (R‐T) phase boundary is known to substantially enhance the piezoelectric properties of potassium‐sodium niobate ceramics, the structural evolution of the R‐T phase boundary itself is still unclear. In this work, the structural evolution of R‐T phase boundary from −150°C to 200°C is investigated in (0.99−x)K0.5Na0.5Nb1−ySbyO3–0.01CaSnO3–xBi0.5K0.5HfO3 (where x = 0‐0.05 with y = 0.035, and y = 0‐0.07 with x = 0.03) ceramics. Through temperature‐dependent powder X‐ray diffraction (XRD) patterns and Raman spectra, the structural evolution was determined to be Rhombohedral (R, <−125°C)→Rhombohedral + Orthorhombic (R + O, −125°C to 0°C)→Rhombohedral + Tetragonal (R + T, 0 °C to 150°C)→dominating Tetragonal (T, 200°C to Curie temperature (TC)) → Cubic (C, >TC). In addition, the enhanced electrical properties (e.g., a direct piezoelectric coefficient (d33) of ~450 ± 5 pC/N, a conversion piezoelectric coefficient (d33∗) of ~580 ± 5 pm/V, an electromechanical coupling factor (kp) of ~0.50 ± 0.02, and TC~250°C), fatigue‐free behavior, and good thermal stability were exhibited by the ceramics possessing the R‐T phase boundary. This work improves understanding of the physical mechanism behind the R‐T phase boundary in KNN‐based ceramics and is an important step toward their adoption in practical applications.

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“…In particular, A 1g (υ 1 ) and F 2g (υ 5 ) have been detected as being relatively strong scatterings in similar systems to the one studied in this work due to a near-perfect equilateral octahedral symmetry. Finally, the peaks in the region between 100 and 160 cm -1 can be associated with translational models of alkaline niobates K + /Na + and rotational modes of the NbO 6ˉ octahedron 18,19 .…”

Section: Resultsmentioning

confidence: 94%

Effect of ZnO addition on the structure, microstructure and dielectric and piezoelectric properties of K0.5Na0.5NbO3 ceramics

2014

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Microstructure, structure and electrical and dielectric properties of ZnO-doped K 0.5 Na 0.5 NbO 3 (KNN) ceramics were investigated. Powders were obtained by the conventional solid-state method. Samples doped with 0 to 1 mol% of ZnO were sintered at 1125 °C for 2 h. Through XRD spectra, the perovskite structure was detected, in addition to small peaks corresponding to secondary phases. It was also observed that zinc changed the microstructure and grain size of KNN ceramics. The addition of 0.5 mol% of Zn 2+ produced a softening effect in the ferroelectric properties of the material, and increased its final density. Conversely, the addition of 1 mol% of Zn 2+ reduced the sample densification.

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Structural, microstructural and electrical properties evolution of (K,Na,Li)(Nb,Ta,Sb)O3 lead-free piezoceramics through NiO doping

Cited by 44 publications

References 36 publications

Laser patterning of oriented LiNbO₃ crystal particle arrays in NiO‐doped lithium niobium silicate glasses

Laser patterning of oriented LiNbO₃ crystal particle arrays in NiO‐doped lithium niobium silicate glasses

Structural evolution of the R‐T phase boundary in KNN‐based ceramics

Effect of ZnO addition on the structure, microstructure and dielectric and piezoelectric properties of K0.5Na0.5NbO3 ceramics

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Structural, microstructural and electrical properties evolution of (K,Na,Li)(Nb,Ta,Sb)O3 lead-free piezoceramics through NiO doping

Cited by 44 publications

References 36 publications

Laser patterning of oriented LiNbO3 crystal particle arrays in NiO‐doped lithium niobium silicate glasses

Laser patterning of oriented LiNbO3 crystal particle arrays in NiO‐doped lithium niobium silicate glasses

Structural evolution of the R‐T phase boundary in KNN‐based ceramics

Effect of ZnO addition on the structure, microstructure and dielectric and piezoelectric properties of K0.5Na0.5NbO3 ceramics

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Laser patterning of oriented LiNbO₃ crystal particle arrays in NiO‐doped lithium niobium silicate glasses

Laser patterning of oriented LiNbO₃ crystal particle arrays in NiO‐doped lithium niobium silicate glasses