Growth behaviour of potassium sodium niobate single crystals grown by solid-state crystal growth using K4CuNb8O23 as a sintering aid

Fisher, John G.; Benčan, Andreja; Godnjavec, Jerneja; Kosec, Marija

doi:10.1016/j.jeurceramsoc.2007.11.010

Cited by 37 publications

(26 citation statements)

References 28 publications

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“…The effect of the amount of sintering aid on single crystal growth, matrix grain growth and single crystal composition was investigated (Fisher et al, 2008b). Single crystals were grown from (K 0.5 Na 0.5 )NbO 3 powders with additions of 0, 0.5 and 2 mol % K 4 CuNb 8 O 23 , using <001>-oriented KTaO 3 seed crystals.…”

Section: Effect Of Sintering Aid On Crystal Growth and Compositionmentioning

confidence: 99%

“…Single crystals were grown from (K 0.5 Na 0.5 )NbO 3 powders with additions of 0, 0.5 and 2 mol % K 4 CuNb 8 O 23 , using <001>-oriented KTaO 3 seed crystals. Before the crystal growth experiments, samples were pre-densified by hot-pressing at 975°C / 50 MPa for 2 h. Crystals were then grown in air under atmospheric pressure at 1100°C for 1-20 h. (Fisher et al, 2008b) Secondary electron SEM images of crystals which had been grown at 1100°C for 10 h are shown in Fig.6 (a) (Fisher et al, 2008b) This behaviour is explained by considering the effect of the liquid phase on both single crystal growth and matrix grain growth. Because the seed crystal acts as a very large grain, for the single crystal equation [2] can be approximated to:…”

Section: Effect Of Sintering Aid On Crystal Growth and Compositionmentioning

confidence: 99%

“…Nominal composition for (K 0.5 Na 0.5 )NbO 3 10 10 1 Table 1. EDXS analyses of single crystals and matrix grains of samples annealed at 1100°C for 10 h (Fisher et al, 2008b). The SSCG method was successfully applied to the growth of (Li, Ta)-KNN modified single crystals (Fisher et al, 2007b (Fig.8).…”

Section: Effect Of Sintering Aid On Crystal Growth and Compositionmentioning

confidence: 99%

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Growth and Characterization of Single Crystals of Potassium Sodium Niobate by Solid State Crystal Growth

Benčan¹,

Tchernychova²,

Kosec³

et al. 2011

Ferroelectrics - Material Aspects

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Section: Effect Of Sintering Aid On Crystal Growth and Compositionmentioning

confidence: 99%

Section: Effect Of Sintering Aid On Crystal Growth and Compositionmentioning

confidence: 99%

Section: Effect Of Sintering Aid On Crystal Growth and Compositionmentioning

confidence: 99%

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Growth and Characterization of Single Crystals of Potassium Sodium Niobate by Solid State Crystal Growth

Benčan¹,

Tchernychova²,

Kosec³

et al. 2011

Ferroelectrics - Material Aspects

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“…Recent reports announced the fabrication of an ultrasonic shear mode motor prototype based on KNN-Li-Cu ceramic drive elements [45,46]. Moreover, Cu additions may play an important role when tailoring [3,23,42] or texturing [77] the microstructure of the KNN-based ceramics.…”

Section: Knn With Cu Additionsmentioning

confidence: 99%

Influence of the A/B Stoichiometry on Defect Structure, Sintering, and Microstructure in Undoped and Cu-Doped KNN

Hoffmann

Kungl

Acker

et al. 2011

Lead-Free Piezoelectrics

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Development of ceramics based on the alkaline niobate (KNN) system is one of the major lines of current research pointing to substitution of the lead containing ferroelectrics by lead-free materials. Sodium potassium niobate (K 0.5 Na 0.5 )NbO 3 is a prototype material of lead-free alkaline-transition metal ferroelectrics with A 1þ B 5þ O 2À 3 perovskite structure. Processing procedures for KNN-based ceramics are however challenging due to the hygroscopic behavior of sodium-and potassium carbonates and the evaporation of alkalines at the elevated processing temperatures, which make it difficult to control the stoichiometry of the ceramics. Alkaline (A-site) or niobium (B-site) excess results in pronounced qualitative differences of the microstructure in KNN ceramics.Similar to many other perovskite ceramics, the functional characteristics are only moderate for pure KNN, but attempts to improve both performance and processing stability by the addition of dopants are underway. Hereby one line of development is the addition of copper or copper containing sintering additives. Discussion of the effects of Cu additions to KNN has to distinguish according to the level of Cu addition and to face the interrelationship between Cu content and A/B stoichiometry. When adding small amounts of Cu, remaining well below the solubility limit, Cu will be incorporated into the KNN lattice by definition.

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“…6,7 In the KNN case, only KTaO 3 crystal seed was found to be suitable for SSCG. [8][9][10] However, high quality KTaO 3 single crystals are rather expensive, especially for the h110i-oriented ones. Therefore, it is attractive to develop a seed-free solid-state crystal growth method (SFSSCG) to grow high-performance KNN single crystals.…”

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confidence: 99%

Large piezoelectric properties in KNN-based lead-free single crystals grown by a seed-free solid-state crystal growth method

Yang

Zhang

Yang

et al. 2016

Applied Physics Letters

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We report lead-free single crystals with a nominal formula of (K0.45Na0.55)0.96Li0.04NbO3 grown using a simple low-cost seed-free solid-state crystal growth method (SFSSCG). The crystals thus prepared can reach maximum dimensions of 6 mm × 5 mm × 2 mm and exhibit a large piezoelectric coefficient d33 of 689 pC/N. Moreover, the effective piezoelectric coefficient d33*, obtained under a unipolar electric field of 30 kV/cm, can reach 967 pm/V. The large piezoelectric response plus the high Curie temperature (TC) of 432 °C indicate that SFSSCG is an effective approach to synthesize high-performance lead-free piezoelectric single crystals.

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Growth behaviour of potassium sodium niobate single crystals grown by solid-state crystal growth using K4CuNb8O23 as a sintering aid

Cited by 37 publications

References 28 publications

Growth and Characterization of Single Crystals of Potassium Sodium Niobate by Solid State Crystal Growth

Growth and Characterization of Single Crystals of Potassium Sodium Niobate by Solid State Crystal Growth

Influence of the A/B Stoichiometry on Defect Structure, Sintering, and Microstructure in Undoped and Cu-Doped KNN

Large piezoelectric properties in KNN-based lead-free single crystals grown by a seed-free solid-state crystal growth method

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