Large Field-Induced Strain Properties of Sr(K0.25Nb0.75) O3-Modified Bi1/2(Na0.82K0.18)1/2TiO3 Lead-Free Piezoelectric Ceramics

Tran, Vu Diem Ngoc; Ullah, Aman; Dinh, Hinh T.; Lee, Jae‐Shin

doi:10.1007/s11664-016-4445-1

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…We propose that the broadened peaks at higher values of T s in the MWS-derived ceramics may be ascribed to the improvement in density and/or grain size, which contributes to decrease the leakage current and enhances the ferroelectricity. It was also reported that the increased sintering temperature in (Na 0.5 K 0.5 )NbO 3 -based materials can enhance ferroelectricity [39] or rhombohedral symmetry in MWS-derived specimens [16,[23][24][25][26][27][28][29][30][31]. Previous studies on the effect of BaZrO 3 (BZ)-modification on the crystal structure of BNKT ceramics [32] have found that the BZ modification induces a phase transition from rhombohedral to pseudocubic symmetry.…”

Section: Resultsmentioning

confidence: 99%

“…In this respect, Biperovskite compounds have also attracted much attention as leadfree actuator materials, because of their large strains [16,[23][24][25][26][27][28][29][30][31]. 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].…”

Section: Introductionmentioning

confidence: 99%

“…However, as is known, BNKT ceramics are fired at temperatures higher than 1150°C, to achieve enough densification [16,[23][24][25][26][27][28][29][30][31]. Therefore, lowtemperature sintering is particularly important in the utilization of BNKT ceramics as the piezoelectrically active lead-free layer in lowcost MLAs.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…This indicated that the Co +3 and Nb +5 ions replaced Ti 4+ at the B-site of the perovskite unit cell. Due to the relatively larger ionic radii of Co 3+ (0.745Å) and Nb 5+ (0.64Å) compared to Ti 4+ (0.605Å) at the B-site, the substituent (Co 0.5 Nb 0.5 ) 4+ ions generated lattice expansion, which then corresponded with the peak positions by shifting toward a lower angle [38][39][40][41][42].…”

Section: Resultsmentioning

confidence: 99%

Optimized Strain Response in (Co0.5Nb0.5)4+-Doped 76Bi0.5Na0.5TiO3-24SrTiO3 Relaxors

Li,

Gao,

et al. 2023

Coatings

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High strain with low hysteresis is crucial for commercial applications in high precision actuators. However, the clear conflict between the high strain and low hysteresis in BNT-based ceramics has long been an obstacle to actual precise actuating or positioning applications. To obtain piezoceramics with high strain and low hysteresis, it is necessary to enhance the electrostrictive effect and develop an ergodic relaxor (ER) and nonergodic relaxor (NR) phase boundary under ambient conditions. In this work, (Co0.5Nb0.5)4+ doped 76Bi0.5Na0.5TiO3-24SrTiO3 (BNST24) relaxors were fabricated using the conventional solid state reaction route. X-ray diffraction patterns revealed the B-site substitution in BNST24 ceramics. By adjusting the (Co0.5Nb0.5)4+ doping in BNST24, we effectively tuned the TNR-ER and Td close to ambient temperature, which contributed to the development of the ergodic relaxor phase and enhanced the electrostrictive effect at ambient temperature. The I-P-E loops and bipolar strain curves verified the gradual evolution from NR to ER states, while the enhanced electrostrictive effect was verified by the nearly linear S-P2 curves and improved electrostrictive coefficient of the BNST24-xCN relaxors. An enhanced strain of 0.34% (d*33 = 483 pm/V) with low hysteresis of 8.9% was simultaneously achieved in the BNST24-0.02CN relaxors. The enhanced strain was mainly attributed to the proximity effect at the ER and NR phase boundary of BNST24-0.02CN, while the improved electrostrictive effect contributed to the reduced strain hysteresis. Our work demonstrates an effective strategy for balancing the paradox of high strain and low hysteresis in piezoceramics.

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Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping

Tran

Van

et al. 2021

J Mater Sci: Mater Electron

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Large Field-Induced Strain Properties of Sr(K0.25Nb0.75) O3-Modified Bi1/2(Na0.82K0.18)1/2TiO3 Lead-Free Piezoelectric Ceramics

Cited by 9 publications

References 24 publications

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

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

Optimized Strain Response in (Co0.5Nb0.5)4+-Doped 76Bi0.5Na0.5TiO3-24SrTiO3 Relaxors

Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping

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