Bipolar piezoelectric fatigue of Bi(Zn0.5Ti0.5)O3-(Bi0.5K0.5)TiO3-(Bi0.5Na0.5)TiO3 Pb-free ceramics

Patterson, Eric A.; Cann, David P.

doi:10.1063/1.4738770

Cited by 68 publications

(28 citation statements)

References 30 publications

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“…The decrease of strain is only 10% after 10 8 cycles for the 92BNT–8BT ceramics. Bi(Zn 0.5 Ti 0.5 )O 3 (BZN) is reported to enhance fatigue resistance in the BNT-BT system [151] and BNT-BKT system [152]. …”

Section: Features Of Actuator Materialsmentioning

confidence: 99%

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

2015

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The ban of lead in many electronic products and the expectation that, sooner or later, this ban will include the currently exempt piezoelectric ceramics based on Lead-Zirconate-Titanate has motivated many research groups to look for lead-free substitutes. After a short overview on different classes of lead-free piezoelectric ceramics with large strain, this review will focus on Bismuth-Sodium-Titanate and its solid solutions. These compounds exhibit extraordinarily high strain, due to a field induced phase transition, which makes them attractive for actuator applications. The structural features of these materials and the origin of the field-induced strain will be revised. Technologies for texturing, which increases the useable strain, will be introduced. Finally, the features that are relevant for the application of these materials in a multilayer design will be summarized.

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Section: Features Of Actuator Materialsmentioning

confidence: 99%

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

2015

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“…[ 18 ] The vast majority of previous fatigue studies has focused on the evolution of macroscopic properties against electric cycling, such as permittivity, remanence, and coercivity. [ 2,[7][8][9]19 ] The microscopic dynamics is then indirectly inferred from the change of property. It should be noted that the polarization state and polarization reversal are intrinsically linked to ferroelectric domain arrangement and its transformation.…”

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confidence: 99%

Nanofragmentation of Ferroelectric Domains During Polarization Fatigue

Guo

Liu

Rödel

et al. 2014

Adv Funct Materials

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The microscopic mechanism for polarization fatigue in ferroelectric oxides has remained an open issue for several decades in the condensed matter physics community. Even though numerous models are proposed, a consensus has yet to be reached. Since polarization reversal is realized through ferroelectric domains, their behavior during electric cycling is critical to elucidating the microstructural origin for the deteriorating performance. In this study, electric field in situ transmission electron microscopy is employed for the first time to reveal the domain dynamics at the nanoscale through more than 103 cycles of bipolar fields. A novel mechanism of domain fragmentation is directly visualized in polycrystalline [(Bi1/2Na1/2)0.95Ba0.05]0.98La0.02TiO3. Fragmented domains break the long‐range polar order and, together with domain wall pinning, contribute to the reduction of switchable polarization. Complimentary investigations into crystal structure and properties of this material corroborate our microscopic findings.

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“…10 Bipolar piezoelectric fatigue is manifested by the loss of switchable polarization and the decrease of strain and piezoelectric coefficient of piezoceramics after being exposed to millions of electric field cycles. It has been extensively studied in PZT [10][11][12] and (Bi 0.5 Na 0.5 )TiO 3 (BNT)-based [13][14][15] ceramics, whereas less fatigue data are available for the KNN system. 16,17 To elucidate the fatigue behavior of piezoceramics, several mechanisms were proposed in the literature, which included domain wall pinning by point defects, 18,19 field screening resulting from the formation of a dead layer underneath the electrodes, 20 or microstructure damage in the material adjacent to the electrodes as a result of large mechanical stresses during the domain switching.…”

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confidence: 99%

“…23 Alternatively, efforts have been made to reduce the concentration of intrinsic defects to prevent domain pinning due to agglomeration from repeated cycling. 14 It is well recognized that either the PPT 23,24 or MPB 7,25 effect is indispensable for enhancing piezoelectricity in KNN-based ceramics. Thus, at first glance it seems to be contradictory to deliver both promising piezoelectric performance and high fatigue resistance in the KNN system via the first method.…”

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confidence: 99%

Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na)NbO3 lead-free piezoceramics

Yao¹,

Patterson²,

Wang³

et al. 2014

Applied Physics Letters

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The bipolar fatigue behavior of (K,Na)NbO3 (KNN)-based lead-free piezoceramics was investigated. A comparative analysis demonstrated that CaZrO3-modified KNN ceramics exhibited highly enhanced bipolar fatigue resistance due to the reduced lattice distortion (c/a ratio) and coexistence of orthorhombic and tetragonal phases. The hypothesis was verified by systematical studies of cycle-dependent large and small signal parameters and micro-morphologies. It was identified that mechanical stress induced microstructure damage beneath the electrodes renders the KNN ceramics to be vulnerable to bipolar cycling; while the mild fatigue behavior for CaZrO3-modified ones mainly originates from a thermally reversible domain wall pinning.

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Bipolar piezoelectric fatigue of Bi(Zn_0.5Ti_0.5)O₃-(Bi_0.5K_0.5)TiO₃-(Bi_0.5Na_0.5)TiO₃ Pb-free ceramics

Abstract: Articles you may be interested inLarge strain response based on relaxor-antiferroelectric coherence in Bi0.5Na0.5TiO3-SrTiO3-(K0.5Na0.5)NbO3 solid solutions Lead-free piezoelectric ceramics based on (0.97−x)K0.48Na0.52NbO3-0.03Bi0.5(Na0.7K0.2Li0.1)0.5ZrO3-xB0.5Na0.5TiO3 ternary system

Cited by 68 publications

References 30 publications

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

Nanofragmentation of Ferroelectric Domains During Polarization Fatigue

Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na)NbO3 lead-free piezoceramics

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