Dielectric and piezoelectric characteristics of lead-free Bi0.5(Na0.84K0.16)0.5TiO3 ceramics substituted with Sr

Yoo, Juhyun; Oh, Dongon; Jeong, Yeong-Ho; Hong, Jae-Il; Jung, Moonyoung

doi:10.1016/j.matlet.2004.08.011

Cited by 80 publications

(29 citation statements)

References 7 publications

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“…Table 1 exhibits the piezoelectric and ferroelectric properties of new BNT-based ceramics developed in present work. From Table 1, it can be found that these new systems [4,11] 88 0.179 32.6 4.64 BNT-NaSbO 3 [12] -0.368 --BNT-BKT-BT [13] 191 0.34 35.9 -BNT-BT-NaNbO 3 [14,25] 1 1 0 ---BNT-BKT-NaNbO 3 [15] -0.289 --BNT-BKT-BT-NaNbO 3 [15] -0.421 --Modified BNT-BKT and BNT-BT by partially substitution in B-site [15][16][17][18][19][20] -0.32 -BNT-BiCrO 3 [21] -0.312 --(Bi 0.5 Na 0.5 ) (1−1.5x) L x TiO 3 (L=La, Bi) [22,23] BNT-Ba(Cu 1/2 W 1/2 )O 3 [6] 95 0.21 --Bi 0.5 (Na 0.84 K 0.16 ) 0.5 TiO 3 -SrTiO 3 [24] 185 Table 2 shows the piezoelectric and ferroelectric properties of BNT-based ceramics published recently in papers and patents prepared by conventional ceramic technique. It can be seen that pure BNT ceramics provide the piezoelectric constant d 33 of 58 pC/N [9], and some classic BNTbased ceramics, such as BNT-BT [5], BNT-BKT [2], BNT-BT-BKT [5], BNT-NaNbO 3 [4], give piezoelectric properties of d 33 =152, 96, 191, 88 pC/N, and k p =0.24, 0.314, 0.33, 0.179, respectively.…”

Section: Resultsmentioning

confidence: 99%

Studies on new systems of BNT-based lead-free piezoelectric ceramics

et al. 2007

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Several new systems of Bi 0.5 Na 0.5 TiO 3 -based leadfree piezoelectric ceramics were proposed based on the design of the multiple complex in the A-site of ABO 3 compounds. These ceramics were prepared by conventional ceramic techniques. The comparison of the piezo-and ferroelectric properties of these ceramics with those of the best properties of the Bi 0.5 Na 0.5 TiO 3 -based lead-free piezoelectric ceramics published recently shows that these ceramics of the new systems have better ferroelectric and piezoelectric performance, and better temperature characteristic of the properties. Among these materials, Bi 0.5 (Na 1−x−y K x Li y ) 0.5 TiO 3 possesses higher piezoelectric constant (d 33 =230.8 pC/N), higher electromechanical couple factor (k p =0.41), larger remanent polarization (P r =40 μC/cm 2 ) and a better P-E hysteresis loop below 200°C. Practical devices such as ceramic middle frequency filters and buzzers have been made by using these lead-free piezoelectric ceramics.

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Section: Resultsmentioning

confidence: 99%

Studies on new systems of BNT-based lead-free piezoelectric ceramics

et al. 2007

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“…Yoo et al studied the variations of Sr substitution on leadfree Bi 0.5 (Na 0.84 K 0.16 ) 0.5 TiO 3 system [60] and concluded that the crystal structure of the specimen moved from tetragonal to tetragonal-rhombohedral MPB with 4-6 mol% Sr addition. The piezoelectric constant, d 33 was 185 pC/N ( Table 9).…”

Section: Effect Of Strontium (Sr)mentioning

confidence: 99%

Review: environmental friendly lead-free piezoelectric materials

2009

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Lead zirconate titanate (PZT) based piezoelectric materials are well known for their excellent piezoelectric properties. However, considering the toxicity of lead and its compounds, there is a general awareness for the development of environmental friendly lead-free materials as evidenced from the legislation passed by the European Union in this effect. Several classes of materials are now being considered as potentially attractive alternatives to PZTs for specific applications. In this paper, attempts have been made to review the recent developments on lead-free piezo materials emphasizing on their preparation, structure-property correlation, etc. In this context, perovskite systems such as bismuth sodium titanate, alkali niobates (ANbO 3 ), etc. and non-perovskites such as bismuth layer-structured ferroelectrics are reviewed in detail. From the above study, it is concluded that some lead-free compositions show stable piezoelectric responses even though they do not match the overall performance of PZT. This has been the stimulant for growing research on this subject. This topic is of current interest to the researchers worldwide as evidenced from the large number of research publications. This has motivated us to come out with a review article with a view that it would give further impetus to the researchers already working in this area and also draw the attention of the others.

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“…[8,12,17,19,21,22,24,25,28,36,37,43,46,47,54,60,62,63,67,69,76] According to Liu and Ren [27], a large piezoelectricity of this system is due to the existence of cubic-rhombohedral-tetragonal (C-R-T) triple point, as depicted in Fig. 9.4.…”

Section: Barium Titanatementioning

confidence: 99%

“…The transitions from cubic to tetragonal, tetragonal to orthorhombic, and then orthorhombic to rhombohedral occur at 435, 225, and À10 C, respectively [35,61]. KNbO 3 (KN) and NaNbO 3 (NN) can form a solid solution over the whole composition range and undergo similar structural phase transitions to KN upon [8,12,21,24,25,36,54,60,62,63,67,76] cooling (see Fig. 9.8).…”

Section: Knn and Modified Knn Systemmentioning

confidence: 99%

“…9.10, the electromechanical coupling factors were found to decrease by 10% with thermal cycling as a result of cycling through regions with distinctly different domain configuration, significantly limiting their temperature range of operations [68]. [8,12,19,21,24,25,36,43,46,54,60,62,63,67,76] In an attempt to improve thermal stability and mitigate property degradation, further modification has been made on KNN system with the addition of calcium to the KNN system because calcium is known as an effective dopant to shift lower PPTs of BaTiO 3 downward without decreasing T C . Figure 9.11 shows the temperature-dependent properties of modified KNN system.…”

Section: Knn and Modified Knn Systemmentioning

confidence: 99%

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Perovskite Lead-Free Piezoelectric Ceramics

Lee

Zhang

2011

Lead-Free Piezoelectrics

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For more than 50 years, lead zirconate titanate (PZT) and related lead-based perovskite compositions have been the mainstay for a wide range of piezoelectric applications, such as actuators, sensors, and ultrasound transducers, owing to their superior piezoelectric and electromechanical properties. In the last few years, research studies have become more concentrated in the development of lead-free piezoelectric ceramics with properties comparable to those of PZT ceramics due to environmental regulations, for example, the legislation regarding lead-containing equipment will be enforced in the EU as the draft directives on Waste from Electrical and Electronic Equipment (WEEE), Restriction of Hazardous Substances (RoHS), and end-of-life vehicles (ELV). It is expected that the USA and Japan will also have similar regulations in the near future.The key material properties that are typically considered for piezoelectric applications are electromechanical coupling (k ij ), dielectric permittivity (e r ), and piezoelectric coefficients (d ij ). For example, high strain actuators, such as fuel injectors, piezoelectric materials require high strain d 33 , e.g., >600 pC/N with broad temperature usage range, being operational temperature range from À50 to 150 C [41]. For medical ultrasound transducers, the figure of merit is electromechanical coupling factor, since high coupling factor allows effective energy conversion in both transmitting and receiving energy, improving bandwidth and sensitivity of the transducer response. The dielectric permittivity (e r ) of a piezoelectric material is an important consideration for the design of transducer since it determines the electrical impedance of the transducer. High permittivity is also beneficial for achieving high piezoelectric response of piezoelectric materials since e r is correlated to a piezoelectric constant (d ij )

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Dielectric and piezoelectric characteristics of lead-free Bi0.5(Na0.84K0.16)0.5TiO3 ceramics substituted with Sr

Cited by 80 publications

References 7 publications

Studies on new systems of BNT-based lead-free piezoelectric ceramics

Studies on new systems of BNT-based lead-free piezoelectric ceramics

Review: environmental friendly lead-free piezoelectric materials

Perovskite Lead-Free Piezoelectric Ceramics

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