Effect of ZnO on the structure, microstructure and electrical properties of KNN-modified piezoceramics

Rubio-Marcos, Fernando; Romero, J. J.; Navarro-Rojero, M. G.; Fernández, J.F.

doi:10.1016/j.jeurceramsoc.2009.04.026

Cited by 128 publications

(77 citation statements)

References 31 publications

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“…The addition of a small amount of sintering aid (CuO [13], MnO 2 [14], AgTaO 3 [15], SnO 2 [16], ZnO [17], and BiMnO 3 [18]) is an effective method to reduce the sintering temperature and enhance the density. However, the piezoelectric properties of the ceramics could also obviously decrease.…”

Section: Introductionmentioning

confidence: 99%

Influence of sintering temperature on electrical properties of (K0.4425Na0.52Li0.0375)(Nb0.8825Sb0.07Ta0.0475)O3 ceramics without phase transition induced by sintering temperature

et al. 2013

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Lead-free (K 0.4425 Na 0.52 Li 0.0375 )(Nb 0.8825 Sb 0.07 Ta 0.0475 )O 3 (KNLNST) piezoelectric ceramics are synthesized by the conventional solid-state reaction method. The sintering temperature and poling temperature dependence of ceramic properties are investigated. Previous studies have shown that variation of sintering temperature can cause phase transition, similar to the morphotropic phase boundary (MPB) behavior induced by composition changes in Pb(Zr,Ti)O 3 (PZT). And the best piezoelectric performance can be obtained near the phase-transition sintering temperature. In this research, phase transition induced by sintering temperature cannot be detected and excellent piezoelectric properties can still be obtained. The sintering temperature of the largest piezoelectric coefficient of such composition is lower than that of the highest density, which is considered in composition segregation as a result of intensified volatilization of alkali metal oxides. Combined with the effect of poling temperature, the peak values of the piezoelectric properties are d 33 = 313 pC/N, k p = 47%,  r = 1825, tan = 0.024, T o-t = 88 ℃, and T C = 274 ℃.

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Section: Introductionmentioning

confidence: 99%

Influence of sintering temperature on electrical properties of (K0.4425Na0.52Li0.0375)(Nb0.8825Sb0.07Ta0.0475)O3 ceramics without phase transition induced by sintering temperature

et al. 2013

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“…Moreover, small peaks associated to the presence of a secondary phase can be assigned to K 4 Nb 6 O 17 (JCPDS76-0977) resulting from slight changes in stoichiometric ratio due to highly volatile alkaline elements during sintering process. Rubio-Marcos et al studied the effects of ZnO addition on the structure of a more complex system (K 0.44 Na 0.52 Li 0.04 )(Nb 0.86 Ta 0.10 Sb 0.04 )O 3 (KNL-NTS) 13 . They found that the perovskite structure with tetragonal symmetry predominated in all samples.…”

Section: Methodsmentioning

confidence: 99%

“…However, it is also expected that Zn 2+ ions (88pm) replaces niobium ions (Nb 5+ , 78pm) of the lattice with the consequent oxygen vacancies generation producing a hardening effect on the ferroelectric properties of the material 12 . Moreover, other authors suggest the possible A-site replacement of Zn 2+ ions which provokes the cationic vacancies formation which produces a softening effect on the material properties 13 . Li et al determined that with adding 0.6 mol% of ZnO, the Zn 2+ first enters the A-site while higher amounts of Zn 2+ substitutes B-site ions when the additive was incorporated in the initial mixture 14 .…”

Section: +mentioning

confidence: 99%

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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“…However, the major drawback of KNN ceramics is the need for special handling of the starting powders, sensitivity of properties to nonstoichiometry, and especially a complex densification process [6]. As regards PZT, sintering aids such CuO, SnO 2 , ZnO or MnO 2 may improve sinterability and modify the dielectric and piezoelectric behaviour of the KNN materials [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Improving the functional properties of (K0.5Na0.5)NbO3 piezoceramics by acceptor doping

Vendrell

García

Bril

et al. 2015

Journal of the European Ceramic Society

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ZrO 2 and TiO 2 modified lead-free (K 0.5 Na 0.5 )NbO 3 (KNN) piezoelectric ceramics are prepared by conventional solid-state reaction. The effect of acceptor doping on structural and functional properties are investigated. A decrease in the Curie temperature and an increase in the dielectric constant values are observed when doping. More interestingly, an increase in the coercive field E c and remanent polarization P r is observed. The piezoelectric properties are greatly increased when doping with small concentrations dopants. ZrO 2 doped ceramic exhibits good piezoelectric properties with piezoelectric coefficient d 33 =134 pC/N and electromechanical coupling factor k p =35%. It is verified that nonlinearity is significantly reduced. Thus, the creation of complex defects capable of pinning the domain wall motion is enhanced with doping, probably due to by the formation of oxygen vacancies.These results strongly suggest that compositional engineering using low concentrations of acceptor doping is a good means of improving the functional properties of KNN lead-free piezoceramic system.

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Effect of ZnO on the structure, microstructure and electrical properties of KNN-modified piezoceramics

Cited by 128 publications

References 31 publications

Influence of sintering temperature on electrical properties of (K0.4425Na0.52Li0.0375)(Nb0.8825Sb0.07Ta0.0475)O3 ceramics without phase transition induced by sintering temperature

Influence of sintering temperature on electrical properties of (K0.4425Na0.52Li0.0375)(Nb0.8825Sb0.07Ta0.0475)O3 ceramics without phase transition induced by sintering temperature

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

Improving the functional properties of (K0.5Na0.5)NbO3 piezoceramics by acceptor doping

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