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Enhanced piezoelectric properties and depolarization temperature in textured(Bi_(0.5)Na_(0.5))TiO_(3)-based ceramics via homoepitaxial templated grain growth

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Journal of Materials Science & Technology 2024年第9期176卷 91-98页

作者： Yaqing Ma Linjing Liu Hang Xie Zerui Zhang Qiangwei Kou Rui Lv Bin Yang Yunfei Chang Fei Li Functional Materials and Acousto-Optic Instruments Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Electronic Materials Research Laboratory(Key Lab of Education Ministry) State Key Laboratory for Mechanical Behavior of Materials and School of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Enhanced piezoelectric response was usually achieved in(Bi_(0.5) Na_(0.5))TiO_(3)(BNT)-based ceramics with sacrifice of depolarization temperature T_(d),seriously limiting their usage range in electromechanical *** this work,we propose to explore piezoelectric anisotropy and domain engineering in compositionµstructure-controlled textured ceramics to resolve this issue.[001]c-textured 0.94(Bi_(0.5) Na_(0.5))TiO_(3)–0.06BaTiO_(3)(0.94BNT-0.06BT)ceramics with Lotgering factor F_(001)-91% were fabricated through homoepitaxial templated grain growth(TGG)via using 0.94BNT-0.06BT microplatelet *** textured samples exhibited more ordered domains with facilitated domain switching behavior,being consistent with saturated high polarization achieved at lower electric *** F_(001) to above 60%enables rapid enhancement of piezoelectric ***,compared to non-textured counterpart,the maximally textured ceramics exhibited-236%enhanced piezoelectric coefficient(d_(33)-302 pC/N)and-280% enhanced piezoelectric voltage coefficient(g_(33)-49.8×10^(−3)Vm/N),together with slightly increased depolarization temperature(T_(d)-106℃).Moreover,those values are approaching or even higher than the single-crystal *** work not only provides important guidelines for design and synthesis of novel textured ceramics with improved comprehensive electrical properties,but also can expand application fields of BNT-based ceramics.

关键词： Lead-free ceramics templated grain growth Piezoelectric coefficient Depolarization temperature Domain dynamics

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PHASE-FIELD SIMULATION FOR MICROSTRUCTURAL DEVELOPMENT OF TEXTURED CERAMICS PREPARED BY REACTION templated grain growth

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Journal of Advanced Dielectrics 2012年第1期2卷 98-106页

作者： LIANGLIANG LIU FENG GAO GUOXIN HU JIANGNAN LIU State Key Laboratory of Solidification Processing College of Material Science and Engineering Northwestern Polytechnical University Xi'an 710072 P.R.China Xi'an Polytechnic University Xi'an 710048 China

A modified model using phase-field method in order to describe the microstructural development for the reaction templated grain growth process was *** current model well expressed anisotropic enlargement of the template *** initial parameters such as the matrix particles size,the template particles size,fraction,aspect ratio of the template particles and porosity were *** simulation results show that the fraction of oriented grains increases with decreasing the matrix particles size and porosity,and increasing the fraction of the initial template *** increase for the aspect ratio of template particles gives rise to the anisotropic microstructure *** study suggests that the simulation results would give a guiding principle in terms of the initial preparation conditions for the textured ceramics having both a large fraction of oriented grains and anisotropic microstructure.

关键词： Phase-field simulation templated grain growth anisotropic functional ceramics

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