Low Temperature Sintering and Piezoelectric Properties of CuO-Doped (K0.5Na0.5)NbO3Ceramics

Ahn, Chang Wook; Karmarkar, Makarand; Viehland, Dwight; Kang, Dong Heon; Bae, Kyoo Sik; Priya, Shashank

doi:10.1080/07315170802353058

Cited by 29 publications

(15 citation statements)

References 15 publications

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“…Similar trends for the electrical properties they found for the Sb-modified KNN variant [62]. Ahn et al [2] analyzed the high field polarization behavior in KNN-Cu prepared by a similar route. An improved polarization behavior leading to a square-shaped polarization vs. electric field (P -E) curve, most marked for 1.5 mol% CuO additions was reported and correlated with the enhanced densities.…”

Section: Knn With Cu Additionssupporting

confidence: 63%

“…In the KNN-Cu ceramics with niobium excess elevated strain is obtained in particular for the The effects of the dipole formation, the formation of secondary phases and changes in the alkaline-mobium stoichiometry will play an important part in the effects on the piezoelectric properties of the KNN-Cu ceramics. However, other characteristics which influence the piezoelectric properties in ferroelectric ceramics, such as grain size effects [43,64], differences in density [2], modification in the Na-K solid solution composition and shifts in the polymorphic phase transition temperature [3,4,88] have also to be taken into account.…”

Section: Methodology Of Analysis Based On Linear Programming Techniqumentioning

confidence: 99%

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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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Section: Knn With Cu Additionssupporting

confidence: 63%

Section: Methodology Of Analysis Based On Linear Programming Techniqumentioning

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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show abstract

“…A significant fraction of research done on KNN-based ceramics is focused on rectifying the problem of low sinterability [27,32,[43][44][45][46]. This work includes the application of different nonconventional sintering techniques as well as use of different sintering additives.…”

Section: Processing Of Knn-based Ceramicsmentioning

confidence: 99%

Development of KNN-Based Piezoelectric Materials

Gupta

Maurya

Yan

et al. 2011

Lead-Free Piezoelectrics

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“…In spite of all its merits as a piezoelectric material, low sinterability restricts the usage of KNN for any device application [4,6,[11][12][13][14][15]. Prior research has shown that the maximum density for KNN synthesized through conventional sintering process could be achieved at temperatures 1,000-1,100°C and lies in the range of 90-95 % of the theoretical density [6,11,16].…”

Section: Introductionmentioning

confidence: 99%

“…Most common of them is the use of different oxides as sintering additives which melt below the sintering temperature of KNN and provide higher density by means of liquid phase sintering (LPS) [6,15,18] (KCN) and MnO 2 are few of the most common sintering additives used with KNN [6,[13][14][15][16][17][18][19][20]. But, during sintering, most of these additives diffuse in the KNN lattice and alter the stoichiometry [6,13,14,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of high density and reduced ionic defects on piezoelectric behavior of K0.5Na0.5NbO3 ceramic

Gupta

Priya

2014

Appl. Phys. A

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A reduced concentration of ionic defects along with [99 % of the theoretical density has been achieved for K 0.5 Na 0.5 NbO 3 ceramic by employing a twofold sintering technique. Lower concentration of ionic defects resulted in an order of magnitude improvement in the resistivity and hence enhanced poling of the ceramic at 100°C. High density and improved poling of the ceramic resulted in a significant improvement in electromechanical properties while maintaining the high orthorhombictetragonal (T o-t ) and Curie (T c ) temperatures of K 0.5 Na 0.5-NbO 3 (200 and 395°C respectively). A comparison with the previous studies suggested that the piezoelectric properties of the ceramic synthesized in this study were similar to those synthesized using complex techniques such as spark plasma sintering and hot pressing. This is a significant advancement facilitating the possibility of transition of K 0.5 Na 0.5 NbO 3 ceramic toward device application.

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Low Temperature Sintering and Piezoelectric Properties of CuO-Doped (K_0.5Na_0.5)NbO₃Ceramics

Cited by 29 publications

References 15 publications

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

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

Development of KNN-Based Piezoelectric Materials

Effect of high density and reduced ionic defects on piezoelectric behavior of K0.5Na0.5NbO3 ceramic

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