Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

Reichmann, Klaus; Feteira, Antônio; Li, Ming

doi:10.3390/ma8125469

Cited by 137 publications

(59 citation statements)

References 156 publications

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“…3 The origin of the large field-induced strain was attributed to the coexistence of non-ergodic polar nanoregions(PNRs) with R3c space group and ergodic PNRs with P4bm space group. [4][5][6] Zhang et al observed a giant electrostrictive strain of 0.45% and an strain coefficient of (0.021-0.027) m 4 /C 2 in the 0.94NBT-0.06BaTiO 3 -0.02K 0.5 Na 0.5 NbO 3 . 7 In a word, constructing relaxor ferroelectrics with coexistence of nonergodic and ergodic PNRs is the key to obtain electrostrictive strained materials with hysteresis-free and large strain coefficient.…”

Section: Introductionmentioning

confidence: 99%

Lead-free Bi(Mg0.5Ti0.5)O3-modified 0.875Bi0.5Na0.5TiO3-0.125BaTiO3 ferroelectric ceramics with tetragonal structure and large field-induced strains

et al. 2017

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A electrostrictive ceramics were designed by introducing Bi(Mg0.5Ti0.5)O3 into 0.875Bi0.5Na0.5TiO3-0.125BaTiO3 with tetragonal structure. All the specimens prepared by a conventional solid sintering technique exhibit the excellent sintering ability with a high relative density over 97%. It is found that, as BMT added, the specimens undergo a structure crossover from ferroelectric P4mm to ergodic P4bm, and the coexistence of both tetragonal structures takes bridge between them. A large field-induced strain of 0.30% and field-independent strain coefficient of 0.0254 m4/C2 occur at 4 mol.% BMT added. This material with excellent sinterability is suitable for the application in actuators and microposition controllers.

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Section: Introductionmentioning

confidence: 99%

Lead-free Bi(Mg0.5Ti0.5)O3-modified 0.875Bi0.5Na0.5TiO3-0.125BaTiO3 ferroelectric ceramics with tetragonal structure and large field-induced strains

et al. 2017

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“…The substitution of A and B sites is suitable to solve the problem of high coercive electric field. [4][5][6] To overcome the second drawback, one must be decreasing the value of depolarization temperature from 200 C to nearly room temperature in order to enhance the piezoelectric performance. In this research, the substitution of A-site in BNT with Ba þ2 had been done, it had an ionic radius greater than (Bi,Na).…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of BNT-xBT prepared by hydrothermal process

Mahmood

Al‐Shakarchi

2017

J. Adv. Dielect.

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The BNT ceramic sample might be a good replacement for PZT piezoelectric in industrial applications, especially in energy harvesting from crystal vibrations. In order to enhance the performance of BNT ceramic, the solid solution was chosen by substitution with Ba þ2 at Morphtropic Phase Boundary (MPB). The BNT-xBT powders with x ¼ 1, 0.07, 0.06 and 0 were prepared by the hydrothermal method with average particle size (65-150 nm) at (90 C/72 h). The ceramic disc was sintered at (1150 C/4 h) and showed excellent relative density of about 96%. The results of X-ray diffraction (XRD) confirmed the MPB for x ¼ 0:06 and 0.07, while the BNT had a rhombohedral structure and BT had a tetragonal structure. The dielectric measurements showed that BNT, BNT-7BT, BNT-6BT behave as the relaxator ferroelectric and showed a strong dependence on frequency, especially in the MPB region while BT behaves as a normal ferroelectric. Both the Curie temperature and depolarization temperature decrease at the MPB region and showed strong dependency on frequency.

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“…The exact nature of the phase transitions in the BNT-BT system below

T_{C}

is still a matter of debate. A detailed review of the properties of BNT-based materials with regard to actuator applications has recently been reported [9]. …”

Section: Introductionmentioning

confidence: 99%

Fabrication of Lead-Free Bi0.5Na0.5TiO3 Thin Films by Aqueous Chemical Solution Deposition

2017

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Piezoelectric ceramics are widely used in actuator applications, and currently the vast majority of these devices are based on Pb(Zr,Ti)O3, which constitutes environmental and health hazards due to the toxicity of lead. One of the most promising lead-free material systems for actuators is based on Bi0.5Na0.5TiO3 (BNT), and here we report on successful fabrication of BNT thin films by aqueous chemical solution deposition. The precursor solution used in the synthesis is based on bismuth citrate stabilized by ethanolamine, NaOH, and a Ti-citrate prepared from titanium tetraisopropoxide and citric acid. BNT thin films were deposited on SrTiO3 and platinized silicon substrates by spin-coating, and the films were pyrolized and annealed by rapid thermal processing. The BNT perovskite phase formed after calcination at 500 °C in air. The deposited thin films were single phase according to X-ray diffraction, and the microstructures of the films shown by electron microscopy were homogeneous and dense. Decomposition of the gel was thoroughly investigated, and the conditions resulting in phase pure materials were identified. This new aqueous deposition route is low cost, robust, and suitable for development of BNT based thin film for actuator applications.

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Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

Cited by 137 publications

References 156 publications

Lead-free Bi(Mg0.5Ti0.5)O3-modified 0.875Bi0.5Na0.5TiO3-0.125BaTiO3 ferroelectric ceramics with tetragonal structure and large field-induced strains

Lead-free Bi(Mg0.5Ti0.5)O3-modified 0.875Bi0.5Na0.5TiO3-0.125BaTiO3 ferroelectric ceramics with tetragonal structure and large field-induced strains

Dielectric properties of BNT-xBT prepared by hydrothermal process

Fabrication of Lead-Free Bi0.5Na0.5TiO3 Thin Films by Aqueous Chemical Solution Deposition

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