Structural changes in potassium sodium niobate ceramics sintered in different atmospheres

Fisher, John G.; Rout, Dibyaranjan; Moon, Kyoung‐Seok; Kang, Suk–Joong L.

doi:10.1016/j.jallcom.2008.12.100

Cited by 49 publications

(40 citation statements)

References 37 publications

(48 reference statements)

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“…In KNN and BNT systems, the stoichiometry is difficult to control 82 and significant concentration of A-site and oxygen vacancies cannot be excluded. 83 It is thus not unreasonable to expect that a better control of stoichiometry and microstructure may improve the piezoelectric properties in these materials. It is an encouraging sign that large extrinsic contributions are seen in undoped BNT-BT (Figs.…”

Section: Further Development Of Lead-free Piezoelectricsmentioning

confidence: 99%

What Can Be Expected From Lead-Free Piezoelectric Materials?

Damjanović

Klein

Jin

et al. 2010

Funct. Mater. Lett.

320

151

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Section: Further Development Of Lead-free Piezoelectricsmentioning

confidence: 99%

What Can Be Expected From Lead-Free Piezoelectric Materials?

Damjanović

Klein

Jin

et al. 2010

Funct. Mater. Lett.

320

151

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“…However, when the doping level is increased, υ 1 moves toward low frequency. This change can be related to a decrease in binding strength caused by an increase in the Nb-O distance associated with the oxygen vacancies formation 20 . On the other hand, the increasing in υ 2 by the Zn concentration can be related to modifications in the stabilized perovskite structure.…”

Section: Resultsmentioning

confidence: 99%

“…According to the phase diagram the niobium excess forms a liquid at 1,058°C that could promote sintering with grain coarsening 16,20 . Also, the appearance of the secondary phase is associated with the transitory liquid phase that assisted sintering process.…”

Section: Resultsmentioning

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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“…It has been found that the structural transition of grain boundary and related grain growth behavior of BaTiO 3 ceramics were closely related to oxygen partial pressure during sintering [21]. Fisher et al [22][23][24] found that the orthorhombic-tetragonal and tetragonal-cubic phase transitions of (K 0.5 Na 0.5 )NbO 3 ceramics became more diffuse when they had a high oxygen vacancy concentration. Zhang et al [25] found that sintering (Ba 0.95 Ca 0.05 )(Ti 0.88 Zr 0.12 )O 3 ceramics in a protective atmosphere could increase dielectric constants.…”

Section: Introductionmentioning

confidence: 99%