Lead-free Bi1/2(Na0.82K0.18)1/2TiO3 relaxor ferroelectrics with temperature insensitive electrostrictive coefficient

Tran, Vu Diem Ngoc; Dinh, Hinh T.; Han, Hongliang; Jo, Wook; Lee, Jae‐Shin

doi:10.1016/j.ceramint.2012.10.046

Cited by 60 publications

(11 citation statements)

References 33 publications

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“…The decrease in T p and T m for the samples with B0.09BZT could be mainly caused by the ion substitutions which had an effect on the increase in the degree of cation disorder and the dynamic of PNRs, resulting in the lower degree of interaction strength between PNRs [17,23,28,43,44]. Such effect was consistent with the previous work that the corresponded temperatures of Bi 1/2 (Na 0.82 K 0.18 ) 1/2 TiO 3 ceramic decreased due to the increase in degree of cation disorder resulted from BaZrO 3 substitution [45]. From the XRD result, it can be seen that the c/a of the 0.12BZT ceramic was greater than those of the ceramics with x B 0.09 mol fraction [38].…”

Section: Resultssupporting

confidence: 89%

“…Although the BNLT ceramic was known as a relaxor ferroelectric material, the field-induced long-range ferroelectric behavior with the square P-E loop could be achieved in the material via high applied field amplitudes. This was consistent with the previous results observed in other lead-free relaxor ferroelectrics [45,46,55,56]. The P-E loop of the 0.06BZT ceramic was constricted with the P r measured at 30°C was equal to 27 lC/cm 2 .…”

Section: Resultssupporting

confidence: 88%

“…This resulted in the increase in d of the BZT-incorporated ceramics. This was consistent with the increase in the degree of DPT of Bi 1/2 (Na 0.82 K 0.18 ) 1/2 TiO 3 ceramic by BaZrO 3 modification [45].…”

Section: Resultssupporting

confidence: 86%

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The effect of BZT doping on phase formation, dielectric and ferroelectric properties of BNLT ceramics

Kantha

Pisitpipathsin

Promsawat

et al. 2015

J Mater Sci: Mater Electron

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In this work, the effect of BaZr 0.05 Ti 0.95 O 3 (BZT) doping on phase, dielectric and ferroelectric properties of a lead-free piezoelectric ceramic system of Bi 0.4871 Na 0.4871 La 0.0172 TiO 3 (BNLT) was studied. The different amounts of BZT were incorporated into BNLT to form (1-x)BNLT-xBZT ceramics (when x = 0, 0.06, 0.09 and 0.12 mol fraction). The rhombohedral phase was presented in the pure BNLT ceramic, which changed into the tetragonal phase with BZT incorporation. The lattice parameters and unit cell volume increased with increasing BZT content. Grain sizes tended to decrease with increasing BZT content. The dielectric constant of the BNLT ceramic was enhanced by BZT incorporation. The dielectric constant was maximized with the 0.09BZT incorporation. The temperature of the dielectric peak of BNLT ceramic decreased while the degree of diffuse phase transition increased with BZT substitution. The polarization-electric field (P-E) curve measured at temperature above 30°C was found to be slimmer with increasing BZT content. The remnant polarization of the BZT-incorporated ceramics decreased with increasing temperature. The observed results were believed to be caused by the lattice distortion and the enhanced cation disorders in A and B-site lattices due to the incorporation of Ba 2? and Zr 4? ions into A and B-site lattices, respectively, of BNLT perovskite structure.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 88%

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The effect of BZT doping on phase formation, dielectric and ferroelectric properties of BNLT ceramics

Kantha

Pisitpipathsin

Promsawat

et al. 2015

J Mater Sci: Mater Electron

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“…The small P r value of CFS-derived specimens is also in agreement with previously reported results on BZ-modified BNKT ceramics [32,33,35], indicating that the BZ-modification induced a phase transition in the BNKT from ferroelectric to relaxor. On the other hand, such a phase transition was not observed in the MWS-derived specimens, which exhibited values of P r from 20 to 54 μC/cm 2 , and of E c from 16 to 21 kV/cm, as shown in Fig.…”

Section: Resultssupporting

confidence: 80%

“…The large strain observed at the normal and relaxor ferroelectric phase boundary was recently found to be closely related to the nanoscale composite of the normal and relaxor ferroelectric phases [30]. In particular, BaZrO 3 -modified Bi 1/2 (Na,K) 1/2 TiO 3 (BNKT) was found to exhibit not only relatively large strains (above 400 pm/V) but also small strain hysteresis, when compared with other bismuthsodium-titanate-based compounds [32][33][34][35]. These advantages make it a promising material for a wide range of precision mechatronic systems, such as fuel injectors for diesel and gasoline engines, position control systems for precision stages, and electronic motors, where low voltage driving is strongly required.…”

Section: Introductionmentioning

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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Giant Electrostrictive Responses and Temperature Insensitive Strain in Barium Titanate‐Based Ceramics

Huang

Zhao

2018

Adv Elect Materials

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property with excellent temperature stability and improved T C in consideration of actual applications. In addition, the electrostrictive effect, serving as a basic electromechanical phenomenon in all insulators or dielectrics, has become a hot topic in the field of lead-free piezoelectric materials. [9][10][11][12] Compared with the piezoelectric effect, the electrostrictive effect has several unique advantages, including little or no hysteretic loss up to high frequencies, superior temperature stability, and a fast response time. [13] Furthermore, electrostriction is a four-rank tensor property, and thus it can be observed in all crystal symmetries. [14] Previously, the best electrostrictive materials are well known as Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) relaxors with a large electrostrictive coefficient Q 33 of 0.02 m 4 C −2 . [15] Recently, some lead-free piezoelectric ceramics with relaxor behavior have exhibited the enhancement of electrostrictive effect due to their hysteresisfree characteristics. [9,11,12] On the other hand, some efforts have been employed to not only improve the electrical properties but also increase the T C of BT-based ceramics by chemical modifications, [16,17] and unfortunately most of the additives deteriorated the T C of BT-based ceramics, such as La, Gd, Sr doping in A-site [18][19][20] or Zr, Sn, Hf doping in B-site. [2,6] Based on above discussions, we want to realize the temperature-insensitive strain and the enhanced electrostrictive effect along with increasing T C by developing the material system of 0.95BaTiO 3 -0.05(M 0.5 N 0.5 )TiO 3 (M = K/Na/Li and N = Ho, Y, Yb, Ga, Nd, Pr, Sm, Gd). A distinguished temperature-insensitive strain behavior from room temperature to 130 °C is achieved in BT-(Li, Ho/Y/Yb)T. In addition, giant electrostrictive coefficient (Q 33 ) of 0.05-0.07 m 4 C −2 , which is twice larger than classical electrostrictive lead-based materials, [15] is observed in BT-(Li, Ho/Y/Yb)T ceramics over a wide temperature region. Meanwhile, inspiringly, an improved T C of 130-145 °C is achieved in BT-(K/Na/Li, Ho/Y)T six samples. A mechanism related to electrostrictive effect has been proposed to explain such an outstanding temperature insensitivity of strain property. It is believed that the giant Q 33 and the good temperature stability of strain would attract potential interest in search of novel leadfree electrostrictive materials.

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Lead-free Bi1/2(Na0.82K0.18)1/2TiO3 relaxor ferroelectrics with temperature insensitive electrostrictive coefficient

Cited by 60 publications

References 33 publications

The effect of BZT doping on phase formation, dielectric and ferroelectric properties of BNLT ceramics

The effect of BZT doping on phase formation, dielectric and ferroelectric properties of BNLT ceramics

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

Giant Electrostrictive Responses and Temperature Insensitive Strain in Barium Titanate‐Based Ceramics

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