CuO as a sintering additive for (Bi1/2Na1/2)TiO3–BaTiO3–(K0.5Na0.5)NbO3 lead-free piezoceramics

Jo, Wook; Ollagnier, Jean-Baptiste; Park, Jonglo; Anton, Eva-Maria; Kwon, O-Jong; Park, Chan; Seo, Hyun-Ho; Lee, Jong‐Sook; Erdem, Emre; Eichel, Rüdiger‐A.; Rödel, Jürgen

doi:10.1016/j.jeurceramsoc.2011.05.008

Cited by 73 publications

(34 citation statements)

References 45 publications

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“…This effect is obvious in the early stage of sintering at the low temperatures below 860°C, but a change in the final temperature necessary for achieving >95% of theoretical density ( T s ) is not so large: T s remains constant at 940°C for the samples with CuO up to 1.0 mol%, and is lowered to 920°C for 2.0 mol% and to 880°C for 4.0 mol%. Thus, it is suggested that the mechanism by which the CuO lowers the sintering temperature in 0.6BF–0.4BKT ceramics differs from that in other ceramics such as PZT based, (Bi 0.5 Na 0.5 )TiO 3 ‐based, and (K 0.5 Na 0.5 )NbO 3 ‐based one, in which the CuO addition results in the significant decrease in the sintering temperature more than 100°C through the formation of liquid phases. Based on the above results, we denote a 0.6BF–0.4BKT ceramic sample doped with x mol% CuO and sintered at T °C as x CuO‐ T in this study.…”

Section: Resultsmentioning

confidence: 99%

“…CuO is one of the most widely used additives for piezoelectric ceramics, and many reports have shown that the CuO addition can significantly lower the sintering temperature of both lead‐based and lead‐free piezoelectric ceramics . On the other hand, the influence of the CuO additive on the ferroelectric and piezoelectric properties depends sensitively on the composition of host ceramics because the Cu 2+ ion has the intermediate ionic radius between A‐ and B‐site ions in a common perovskite ABO 3 lattice.…”

Section: Introductionmentioning

confidence: 99%

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Effects of CuO Addition on Electrical Properties of 0.6BiFeO₃–0.4(Bi_0.5K_0.5)TiO₃ Lead‐Free Piezoelectric Ceramics

Hagiwara

Fujihara

2014

J. Am. Ceram. Soc.

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0.6BiFeO3–0.4(Bi0.5K0.5)TiO3 (0.6BF–0.4BKT) ceramic samples with 0.0–4.0 mol% CuO were prepared by the solid‐state reaction. The CuO addition aided the densification of the samples and slightly increased the lattice constant. The relaxor‐like defuse dielectric peak of 0.6BF–0.4BKT became sharper with increasing the CuO content. Polarization–electric field curve of the undoped 0.6BF–0.4BKT was a pinched loop in the as‐sintered state, while that was a square hysteresis with a large remanent polarization of 48 μC/cm2 after the thermal quenching, demonstrating a strong domain wall pinning due to defect dipoles. We found that the CuO addition up to 2.0 mol% facilitates the polarization switching in the as‐sintered samples to increase the remanent polarization and the piezoelectric d33 coefficient. The results of the structural and electrical investigations suggested that the copper ion acts as a donor in 0.6BF–0.4BKT by compensating the potassium vacancy created by the evaporation of K2O during the calcination and sintering processes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of CuO Addition on Electrical Properties of 0.6BiFeO₃–0.4(Bi_0.5K_0.5)TiO₃ Lead‐Free Piezoelectric Ceramics

Hagiwara

Fujihara

2014

J. Am. Ceram. Soc.

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“…3. The average grain size was determined by the linear intercept method [36], using field-emission scanning electron microscopy photos. The relative density was calculated based both on the real density (determined using an Archimedes method) and the theoretical density (the unit cell volume was determined from the XRD results).…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Conventional and Microwave Sintering of Large Strain Bi-Based Perovskite Ceramics

Kang¹,

Dinh²,

Lee³

et al. 2017

Transactions on Electrical and Electronic Materials

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A comparative study of microwave and conventional sintering of lead-free Bi 1/2 (Na 0.82 K 0.18 ) 1/2 TiO 3 -BaZrO 3 -CuO ceramics is presented. It was found that microwave sintering (MWS) can be successfully applied to the fabrication of large strain Bi-perovskite with electric field-induced strains comparable to those obtained with conventional sintering (CFS). Although MWS resulted in smaller grained microstructures than CFS, the ferroelectric properties were stronger in MWS-derived specimens than in the CFS-derived ones. The piezoelectric strain constant d 33 * of the CFS-derived specimens reached a maximum value of 372 pm/V after sintering at 1100°C, whereas that of MWS-derived specimens peaked at 950°C with a d 33 * value of 324 pm/V.

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“…17) For electrical measurements, a silver paste was screen printed on both sides of specimens and subsequently burnt in at 700 o C for 30 min. The polarization (P) and strain (S) hysteresis as a function of the external electric field (E) were measured in silicon oil by using a modified Sawyer-Tower circuit and a linear variable differential transducer, respectively.…”

Section: Methodsmentioning

confidence: 99%

Effect of Nb Doping on the Dielectric and Strain Properties of Lead–free 0.94(Bi1/2Na1/2)TiO3–0.06BaTiO3 Ceramics

Han¹,

Hong²,

Kong³

et al. 2016

J. Korean Ceram. Soc

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ABSTRACT(Bi 1/2 Na 1/2 ) 0.94 Ba 0.06 (Ti 1-x Nb x )O 3 (BNBTxNb) ceramics were investigated in terms of the crystal structure as well as the ferroelectric, dielectric, and piezoelectric properties. While little change was observed in the microstructure except for a slight decrease in the average grain size, a significant change was noticed in the temperature dependence of dielectric and piezoelectric properties. It was shown that the property changes are closely related to the downward shift in the position of the ferroelectric-to-relaxor transition temperature with increasing amount of Nb doping. A special emphasis is put on the fact that Nb doping is so effective at decreasing the ferroelectric-to-relaxor transition temperature that even at no more than 2 at.% Nb addition, the transition temperature was already brought down slightly below room temperature, resulting in the birth of a large strain at 0.46 %, equivalent to S max /E max = 767 pm/V.

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CuO as a sintering additive for (Bi1/2Na1/2)TiO3–BaTiO3–(K0.5Na0.5)NbO3 lead-free piezoceramics

Cited by 73 publications

References 45 publications

Effects of CuO Addition on Electrical Properties of 0.6BiFeO₃–0.4(Bi_0.5K_0.5)TiO₃ Lead‐Free Piezoelectric Ceramics

Effects of CuO Addition on Electrical Properties of 0.6BiFeO₃–0.4(Bi_0.5K_0.5)TiO₃ Lead‐Free Piezoelectric Ceramics

Comparative Study of Conventional and Microwave Sintering of Large Strain Bi-Based Perovskite Ceramics

Effect of Nb Doping on the Dielectric and Strain Properties of Lead–free 0.94(Bi1/2Na1/2)TiO3–0.06BaTiO3 Ceramics

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CuO as a sintering additive for (Bi1/2Na1/2)TiO3–BaTiO3–(K0.5Na0.5)NbO3 lead-free piezoceramics

Cited by 73 publications

References 45 publications

Effects of CuO Addition on Electrical Properties of 0.6BiFeO3–0.4(Bi0.5K0.5)TiO3 Lead‐Free Piezoelectric Ceramics

Effects of CuO Addition on Electrical Properties of 0.6BiFeO3–0.4(Bi0.5K0.5)TiO3 Lead‐Free Piezoelectric Ceramics

Comparative Study of Conventional and Microwave Sintering of Large Strain Bi-Based Perovskite Ceramics

Effect of Nb Doping on the Dielectric and Strain Properties of Lead–free 0.94(Bi1/2Na1/2)TiO3–0.06BaTiO3 Ceramics

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Effects of CuO Addition on Electrical Properties of 0.6BiFeO₃–0.4(Bi_0.5K_0.5)TiO₃ Lead‐Free Piezoelectric Ceramics

Effects of CuO Addition on Electrical Properties of 0.6BiFeO₃–0.4(Bi_0.5K_0.5)TiO₃ Lead‐Free Piezoelectric Ceramics