Fracture behavior in electrically poled alkaline bismuth- and potassium- based lead-free piezoceramics using Vickers indentation

Wang, Xueyao; Venkataraman, Lalitha Kodumudi; Tan, Chi; Li, Yingwei

doi:10.1016/j.scriptamat.2020.113647

Cited by 30 publications

(11 citation statements)

References 32 publications

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“…Amongst these, Na 1/2 Bi 1/2 TiO 3 -based compositions are versatile and when appropriately modified, demonstrate potential use in (a) solid oxide fuel cells (high ionic conductivity) [ 7 ] and (b) high temperature capacitors [ 8 ] and high-power ultrasonics [ 9 , 10 ] (insulating character with high mechanical quality factor). In particular, Na 1/2 Bi 1/2 TiO 3 -based materials exhibit superior mechanical [ 11 ] and high power [ 9 ] properties in comparison to the lead-based Pb(Zr,Ti)O 3 . Further, processing strategies such as chemical doping [ 12 , 13 , 14 ], composite formation [ 15 , 16 , 17 ] and quenching [ 18 ] have been demonstrated to significantly alter the conductivity [ 19 ], strain [ 20 ], mechanical quality factor [ 14 , 21 , 22 ] and depolarization temperature [ 14 , 16 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

Venkataraman

2021

Materials

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Na1/2Bi1/2TiO3-based materials have gained considerable attention for their potential to exhibit giant strain, very-high ionic conductivity comparable to yttria stabilized zirconia or high mechanical quality factor for use in high power ultrasonics. In recent times, quenching Na1/2Bi1/2TiO3-based compositions have been demonstrated to enhance the thermal depolarization temperature, thus increasing the operational temperature limit of these materials in application. This work investigates the role of quenching-induced changes in the defect chemistry on the dielectric, ferroelectric and piezoelectric properties of quenched Na1/2Bi1/2TiO3-BaTiO3. The quenched samples indeed demonstrate an increase in the bulk conductivity. Nevertheless, while subsequent annealing of the quenched samples in air/oxygen atmosphere reverts back the depolarization behaviour to that of a furnace cooled specimen, the bulk conductivity remains majorly unaltered. This implies a weak correlation between the defect chemistry and enhanced thermal stability of the piezoelectric properties and hints towards other mechanisms at play. The minor role of oxygen vacancies is further reinforced by the negligible (10–15%) changes in the mechanical quality factor and hysteresis loss.

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Section: Introductionmentioning

confidence: 99%

Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

Venkataraman

2021

Materials

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“…These materials have been subjected to detailed structural, microstructural, and electrical characterization. 9,19,20 Figure S1 features the Xray diffraction profiles confirming the phase purity of these materials. Some relevant material properties are tabulated in Table 2.…”

Section: Methodsmentioning

confidence: 79%

“…15,16 While this has been considered in a recent detailed evaluation of the fracture toughness in NBT-BT-based 6 and KNN-based 8 lead-free piezoceramics, the detailed discussion on the effect of non-linearity of lead-free piezoceramics on their fracture strength is still lacking. 17 Furthermore, PZT, NBT-BT, and KNN variants exhibit both low fracture strength 15,17 as well as low fracture toughness 8,9 The purpose of this work, therefore, is to a robust assessment of both the fracture strength and the strength variability of KNN-and NBT-BT based materials. To this end, we quantify the non-linearity during mechanical loading in a bend-bar.…”

Section: Introductionmentioning

confidence: 99%

“…While this has been considered in a recent detailed evaluation of the fracture toughness in NBT‐BT‐based 6 and KNN‐based 8 lead‐free piezoceramics, the detailed discussion on the effect of non‐linearity of lead‐free piezoceramics on their fracture strength is still lacking 17 . Furthermore, PZT, NBT‐BT, and KNN variants exhibit both low fracture strength 15,17 as well as low fracture toughness 8,9 (Table 1).…”

Section: Introductionmentioning

confidence: 99%

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Deformation and bending strength of high‐performance lead‐free piezoceramics

Venkataraman

Isaia

Gong³

et al. 2022

J Am Ceram Soc

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Bending strength of commercially relevant lead-free piezoceramics -0.935Na 0.5 Bi 0.5 TiO 3 -0.065BaTiO 3 (NBT-6.5BT) with and without acceptor Zn-doping and 0.92(K 0.5 Na 0.5 )NbO 3 -0.02(Bi 0.5 Li 0.5 )TiO 3 -xBaZrO3; x = 0.06, 0.07 (KNN-BZ100x) have been quantified using 4-point bending tests and contrasted to that of commercial lead zirconate titanate (PZT, PIC151). The compressive and tensile strength probed using additional strain gauges under 4-point bending indicate negligible non-linear deformation, in stark contrast to that of commercial PIC151. The bending strength of KNN-BZ100x is about 100 MPa, comparable to PIC151, while that of NBT-6.5BT-based materials is about twice that of PIC151 at ∼160 MPa. These results are rationalized based on the intrinsic characteristics of the lead-free piezoceramics in terms of fracture toughness, coercive stress, and Young's modulus. Weibull statistics indicate a higher fracture probability for KNN-based materials, with NBT-6.5BT-based materials featuring Weibull modulus twice that of KNN-based materials.

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“…An abundance of study has been focus on improving ESP but only little attention applying to the hardness. As we all know, the ceramics have a brittle nature due to their strong ionic bonding [20]. When the load is applied, the cracking is generated, but didn't sliding along the slip planes due to the small number of operating slip systems and low density of mobile dislocations.…”

Section: Introductionmentioning

confidence: 99%

Realizing Enhanced Energy Storage and Hardness Performances in 0.90NaNbO3-0.10Bi(Zn0.5Sn0.5)O3 Lead-Free Ceramics

Dong

Chen

et al. 2021

Preprint

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Relaxor behavior has been demonstrated responsible for excellent energy storage characteristics in dielectric materials owing to the fast polarization response, and an ultrahigh energy storage density can also be induced in NaNbO3 (NN)-based ceramics via combining antiferroelectric and relaxor features. Most of the existing reports lead-free dielectric ceramics, nevertheless, are still lacking of the relevant research among domain evolution and relaxor behavior. Herein, a novel lead-free solid solution, (1-x)NaNbO3-xBi(Zn0.5Sn0.5)O3 [xBZS, x = 0.05, 0.10, 0.15, and 0.20] ceramics are designed to further illustrate the above issues. Domain evolutions in xBZS ceramics confirm the contribution of relaxor behavior to the excellent energy storage characteristics, owning to fast polarization rotation based on the low energy barrier of polar nanoregions (PNRs). Consequently, a high energy storage density of 3.14 J/cm3 and energy efficiency of 83.30% are simultaneously available at 0.10BZS ceramics, together with the stabilities of energy storage properties in large temperature range (20-100 °C) and wide frequency range (1-200 Hz). Additionally, for practical applications, the 0.10BZS ceramics display a great discharge energy storage density (Wdis ~1.05 J/cm3), fast discharge rate (t0.9 ~60.60 ns), and high hardness (H ~5.49 GPa). These results indicate that this study may provide a considerable new light on the mechanism of high performance lead-free dielectric energy storage materials.

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Fracture behavior in electrically poled alkaline bismuth- and potassium- based lead-free piezoceramics using Vickers indentation

Cited by 30 publications

References 32 publications

Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

Deformation and bending strength of high‐performance lead‐free piezoceramics

Realizing Enhanced Energy Storage and Hardness Performances in 0.90NaNbO3-0.10Bi(Zn0.5Sn0.5)O3 Lead-Free Ceramics

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