Titanium deficiency in tetragonal-structured (Ba,Ca)(Zr,Ti)O 3 piezoelectric ceramics

Yao, Zhonghua; Qu, Luo; Xu, Chaobing; Zhang, Lin; Hao, Hua; Yu, Zhiyong; Cao, Minghe; Liu, Hanxing

doi:10.1016/j.jallcom.2017.04.088

Cited by 14 publications

(3 citation statements)

References 37 publications

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“…For the synthesis of 0.5Ba(Zr 0.2 Ti 0.8 )O 3 –0.5(Ba 0.7 Ca 0.3 )TiO 3 (BZT–BCT), the raw materials BaZrO 3 , CaCO 3 , BaCO 3, and TiO 2 were mixed and calcined at 1350°C for 6 h. After phase confirmation of calcined powder, polyvinyl alcohol (PVA) was added to the powder, pressed into pellets, and sintered at 1475°C for 4 h 33,34 . Pellets were crushed into powder for composite preparation and sieved through a 25‐micron mesh.…”

Section: Methodsmentioning

confidence: 99%

Synergistic effect of graphene on dielectric and piezoelectric characteristic of PVDF‐(BZT‐BCT) composite for energy harvesting applications

Muduli

Parida

Behura

et al. 2022

Polymers for Advanced Techs

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Piezoelectric energy harvester has attracted considerable attention as an independent power source for applications in biocompatible, implantable, and flexible electronic devices. However, the lacuna of getting enhanced piezoelectric response from flexible lead‐free polymer‐based composite persists in this field. Here, we present a detailed study on the electrical characteristics such as dielectric, ferroelectric, and piezoelectric properties of (PVDF)‐[0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3]‐graphene oxide (GO) three‐phase composite films synthesized by solvent‐casting followed by a hot pressing method. Structural investigations reveal that the fraction of β‐phase of PVDF in all the composites is more than 65%. The dielectric constant of the composite increases up to the threshold value (0.16 wt% for GO and 0.08 wt% for rGO), and further loading causes a decrease in the dielectric constant. The composite with GO concentration of 0.16 wt% (G‐0.16) shows a dielectric constant of 25.6 with a loss tangent of 0.0498. In contrast, composite with reduced graphene oxide (rGO) concentration of 0.08 wt% (R‐0.08) are 24.3 and 0.0681, respectively, at 1 kHz. Remnant polarization and d33 value of G‐0.16 are 0.012 μC cm−2 and 11 pC N−1, respectively, which are six times and four times more than pure PVDF. The piezoelectric harvester from G‐0.16 produces an open‐circuit voltage of ~4 V and a short‐circuit current of ~1.6 μA with simple hand tapping, which is the highest among the compositions, makes it a suitable candidate for piezoelectric energy harvesting applications.

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Section: Methodsmentioning

confidence: 99%

Synergistic effect of graphene on dielectric and piezoelectric characteristic of PVDF‐(BZT‐BCT) composite for energy harvesting applications

Muduli

Parida

Behura

et al. 2022

Polymers for Advanced Techs

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“…In pure BaTiO 3 , three kinds of phase transitions would happen when temperature is elevated or declined, that is, rhombohedral to orthorhombic (R‐O, T R‐O ~−90°C), orthorhombic to tetragonal (O‐T, T O‐T ~0°C), and tetragonal to cubic (T‐C, T C ~120°C) . These phase transition temperatures can be modulated through chemical modifications, and this characteristic has been employed to form a room‐temperature phase boundary to optimize the electrical properties . In 2009, new phase boundary of R‐T is realized by the addition of Ca and Zr into BaTiO 3 , and a high piezoelectric coefficient of 620 pC/N is achieved .…”

Section: Introductionmentioning

confidence: 99%

“…Here, we give consideration to construct a broad phase boundary in BaTiO 3 to not only optimize the piezoelectricity but also the temperature stability. The addition of BaSnO 3 into BT can form the phase boundary with two or three phase coexistence, while the T C decreases rapidly . The CaZrO 3 is then introduced to extend the phase boundary range and stabilize the T C .…”

Section: Introductionmentioning

confidence: 99%

Composition‐driven broad phase boundary for optimizing properties and stability in lead‐free barium titanate ceramics

Zhao

2018

J Am Ceram Soc

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A new piezoelectric system of (1−x−y)BaTiO3‐yCaZrO3‐xBaSnO3 (BT‐yCZ‐xBS) was designed to achieve enhanced piezoelectric/strain properties and temperature stability. First, the relationships between composition, phase, and electrical properties are systematically investigated. The broad phase boundary with successive rhombohedral‐orthorhombic (R‐O) and orthorhombic‐tetragonal (O‐T) was obtained in 0.04 ≤ x ≤ 0.05 and 0.04 ≤ y ≤ 0.07 by tailoring the relationship of composition and phase structure, confirmed by X‐ray diffraction, temperature‐dependent dielectric constants, and Raman spectra. The optimized piezoelectric coefficient of d33 = 560 pC/N, high strain of >0.20%, and large converse piezoelectric coefficient of d33* = 1170 pm/V were realized. Second, the optimized piezoelectricity both demonstrate a stable performance with fluctuation <8% for d33* and 20% for d33 between 22 and 60°C since the broad phase boundary is exhibited in this temperature range. We believe that this work is a successful example to optimize piezoelectric properties and enhance the stability for piezoceramics.

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Enhanced electrical properties in donor–acceptor co-doped Ba(Ti0.92Sn0.08)O3 ceramics

Jin

Zhong

et al. 2019

J Mater Sci: Mater Electron

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Titanium deficiency in tetragonal-structured (Ba,Ca)(Zr,Ti)O 3 piezoelectric ceramics

Cited by 14 publications

References 37 publications

Synergistic effect of graphene on dielectric and piezoelectric characteristic of PVDF‐(BZT‐BCT) composite for energy harvesting applications

Synergistic effect of graphene on dielectric and piezoelectric characteristic of PVDF‐(BZT‐BCT) composite for energy harvesting applications

Composition‐driven broad phase boundary for optimizing properties and stability in lead‐free barium titanate ceramics

Enhanced electrical properties in donor–acceptor co-doped Ba(Ti0.92Sn0.08)O3 ceramics

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