Defect Engineering of Lead-Free Piezoelectrics with High Piezoelectric Properties and Temperature-Stability

Feng, Yu; Li, Weili; Xu, Dan; Qiao, Yulong; Yu, Yang; Zhao, Yu; Fei, Weidong

doi:10.1021/acsami.6b01539

Cited by 99 publications

(38 citation statements)

References 69 publications

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“…The small ionic radii with high mobility of Li + can facilitate ceramic densification and improve its sinterability, which is responsible for the piezoelectric improvement. In addition, a giant mechanical quality factor Q m of ~2100 is achieved in (Li + +Al 3+ ) co‐doped BT ceramic 113 . On the other hand, the d 33 of BT ceramic can be improved by introducing some combinations of aliovalent ions to replace Ti 4+ .…”

Section: Piezoelectricitymentioning

confidence: 99%

Multifunctional barium titanate ceramics via chemical modification tuning phase structure

Zhao

Huang

2020

InfoMat

147

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Global environmental concerns on the toxicity of lead‐based piezoelectrics impel the great mass fervor on investigations of lead‐free alternatives. Barium titanate (BaTiO3, BT) ceramics, the first discovered perovskite ferroelectrics, were widely employed to fabricate dielectric capacitors from 1950s. Since a piezoelectric breakthrough was achieved via chemical modification, intensive researches have been performed embracing lead‐free BT‐based piezoelectrics and their extensional functionalities. In this review, we encompass the state‐of‐the‐art progress on chemical modification tuning phase structure toward advanced electrical properties in BT‐based ceramics. Generally, modulated regularity of cations substitution on phase transition is summarized and clarified. Then, we highlight the common methodologies of phase structure (phase boundary, relaxor phase, room‐temperature phase transition, etc.) design for optimizing piezoelectricity, electrostrictive strain, electrocaloric, dielectric energy storage or permittivity performances, and cover the noticeable developments and relevant physical mechanisms. Finally, perspectives and challenges on future research issues are featured. This review proposes to exert the significant guidance and service for material design of BT‐based and other lead‐free perovskite materials with superior functionalities.

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Section: Piezoelectricitymentioning

confidence: 99%

Multifunctional barium titanate ceramics via chemical modification tuning phase structure

Zhao

Huang

2020

InfoMat

147

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“…And smaller grain size results in smaller domain size and could lead to an increased d 33 due to the enhancement in the extrinsic contribution [47,48]. Additionally, the electrically switchable P D originated from defect-dipoles could also contribute to an increased d 33 [49]. As a result, a moderate level of Bi 2 O 3 deficiency may not lead to a poor d 33 .…”

Section: Electric Propertiesmentioning

confidence: 99%

Modulating the electric and magnetic properties of BiFeO3 ceramics

Zhao

et al. 2017

Materials & Design

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In this work, the electric and magnetic properties of BiFeO 3 (BFO) ceramics are modulated by changing the defect-dipoles using different Bi 2 O 3 contents, where excessive Bi 2 O 3 gives rise to the formation of iron (V Fe) and oxygen (V O) vacancies and Bi 2 O 3 deficiency mainly leads to the formation of bismuth (V Bi) and oxygen vacancies (V O). It is of great interest to note that a rather low leakage current density can be achieved in both Bi 2 O 3 deficient and excessive ceramics. We also find that a moderate level of Bi 2 O 3 deficiency (< 9%) has little influence on d 33. Surprisingly, Bi 2 O 3 excess, widely used for fabricating BFO ceramics with better properties in the past, cannot improve d 33. An enhanced piezoelectricity (d 33 = 49-51 pC/N) can be obtained in the BFO ceramics with a wide Bi 2 O 3 content range (i.e., x = −0.09-0.09). A large remanent polarization (2P r~9 0-119 μC/cm 2) and a tunable magnetization (M r = 0.022-0.038 emu/g and H c = 0.87-4.04 kOe) are achieved in BFO ceramics with x = −0.15-0.15. These defect-dipoles induced by Bi 2 O 3 deficiency or excess can well modulate the electric and magnetic properties of BiFeO 3 ceramics.

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“…Size effects of doping ions are found in almost all dielectric materials, e.g. in both binary oxide and ABO 3 type perovskite 10, 15–19 . As the CP is determined by the defect rather than the average structure, the preparation approach and process conditions of the synthesis of CP materials are therefore critical, affecting the formation of defect structures and thus influencing the dielectric behavior.…”

Section: Introductionmentioning

confidence: 99%

Colossal permittivity behavior and its origin in rutile (Mg1/3Ta2/3)xTi1-xO2

Dong

Chen

et al. 2017

Sci Rep

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This work investigates the synthesis, chemical composition, defect structures and associated dielectric properties of (Mg2+, Ta5+) co-doped rutile TiO2 polycrystalline ceramics with nominal compositions of (Mg2+ 1/3Ta5+ 2/3)xTi1−xO2. Colossal permittivity (>7000) with a low dielectric loss (e.g. 0.002 at 1 kHz) across a broad frequency/temperature range can be achieved at x = 0.5% after careful optimization of process conditions. Both experimental and theoretical evidence indicates such a colossal permittivity and low dielectric loss intrinsically originate from the intragrain polarization that links to the electron-pinned defect clusters with a specific configuration, different from the defect cluster form previously reported in tri-/pent-valent ion co-doped rutile TiO2. This work extends the research on colossal permittivity and defect formation to bi-/penta-valent ion co-doped rutile TiO2 and elucidates a likely defect cluster model for this system. We therefore believe these results will benefit further development of colossal permittivity materials and advance the understanding of defect chemistry in solids.

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Defect Engineering of Lead-Free Piezoelectrics with High Piezoelectric Properties and Temperature-Stability

Cited by 99 publications

References 69 publications

Multifunctional barium titanate ceramics via chemical modification tuning phase structure

Multifunctional barium titanate ceramics via chemical modification tuning phase structure

Modulating the electric and magnetic properties of BiFeO3 ceramics

Colossal permittivity behavior and its origin in rutile (Mg1/3Ta2/3)xTi1-xO2

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