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Stress-induced tailoring of energy storage properties in lead-free Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)ferroelectric bulk ceramics

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Journal of Materiomics 2023年第4期9卷 673-682页

作者： Juliana g.Maier Ahmed gadelmawla Neamul H.Khansur kyle g.webber Department of Materials Science and Engineering Friedrich-Alexander-Universitat Erlangen-Nürnberg(FAU)Martensstraße 591058ErlangenGermany

In this study,the stress-modulated energy storage properties of lead-free polycrystalline Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)was investigated as a function of temperature from 25℃to 55℃.The externally applied uniaxial compressive stress of-160 MPa increased the recoverable energy storage density by 226%to a maximum value of 274 mJ/cm^(3),in addition to enhancing the energy storage efficiency by approximately 10%to a value of 88.2%.The macroscopic mechanical constitutive behavior is presented as well as the stress-dependent dielectric and ferroelectric properties and the Rayleigh behavior in order to elucidate the effect of stress on the energy storage ***,the stress-induced tailoring of energy storage performance can be utilized for other nonlinear dielectric ceramics to tune their extrinsic polarization mechanisms to significantly enhance the recoverable energy density and reduce the hysteretic losses.

关键词： Energy storage Ferroelectric Lead-free Stress-dependent Rayleigh behavior Polarization mechanism

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Requirements for the transfer of lead-free piezoceramics into application

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Journal of Materiomics 2018年第1期4卷 13-26页

作者： Jurij Koruza Andrew J.Bell Till Fromling kyle g.webber Ke Wang Jürgen Rodel Institute of Materials Science Technische Universit€at DarmstadtAlarich-Weiss-Str.264287 DarmstadtGermany Institute for Materials Research School of Chemical and Process EngineeringUniversity of LeedsLeeds LS29JTUK Department of Materials Science and Engineering Friedrich-Alexander-Universit€at Erlangen-NürnbergMartensstr.591058 ErlangenGermany State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University100084 BeijingChina

The recent review for the Restriction of Hazardous Substances Directive(RoHS)by the expert committee,appointed by the European Union,stated that the replacement of PZT“…may be scientifically and technologically practical to a certain degree…”,although replacement“…is scientifically and technically still impractical in the majority of applications.”Thus,two decades of sustained research and development may be approaching fruition,at first limited to a minority of ***,it is of paramount importance to assess the viability of lead-free piezoceramics over a broad range of application-relevant *** are identified and discussed in turn:***,***,*** and Thermal Properties,*** Conductivity,and *** is suggested that the worldwide efforts into the development of lead-free piezoceramics now require a broader perspective to bring the work to the next stage of development by supporting implementation into real *** about pertinent research requirements into a wide range of secondary properties,measurement techniques,and salient literature are provided.

关键词： Piezoceramics Ferroelectrics Lead-free Application Actuators Sensors

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Temperature-dependent dielectric anomalies in powder aerosol deposited ferroelectric ceramic films

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Journal of Materiomics 2022年第6期8卷 1239-1250页

作者： Udo Eckstein Jorg Exner Andreja Bencan golob Katarina Ziberna goran Drazic Hana Ursic Haiko Wittkamper Christian Papp Jaroslaw Kita Ralf Moos kyle g.webber Neamul H.Khansur Department of Materials Science and Engineering Friedrich-Alexander-Universit€at Erlangen-NürnbergGermany Department of Functional Materials University of BayreuthGermany Electronic Ceramics Department Jozef Stefan InstituteLjubljanaSlovenia Department of Materials Chemistry National Institute of ChemistryLjubljanaSlovenia Department of Chemistry and Pharmacy Friedrich-Alexander-Universit€at Erlangen-NürnbergGermany

Room-temperature fabrication of functional ceramic films using powder aerosol deposition(AD)is important for practical ***,the as-processed ferroelectric films show unusual temperature-dependent dielectric response,including enhanced conductivity in the as-processed state and subsequent significant increase in the permittivity following heat *** this work,we investigate the influence of the residual internal stresses developed during the high-impact consolidation process on the dielectric ***,the recombination of charged defects generated during deposition is driven by the temperature and the atmospheric condition during the heat treatment as well as the carrier gas type used during *** treatment up to 500℃ in different atmospheres was used to tune the dielectric and ferroelectric response,highlighting that irrespective of the type of carrier gas,AD deposition process induces charged defects in polar oxide ceramics that can be reduced through heat-treatment far-below their bulk sintering *** electromechanical properties are contrasted to in-situ heating scanning transmission electron microscopy to observe possible local effects,such as crystallization,grain growth,crystal defect structure,or grain *** addition X-ray diffraction and X-ray photoelectron spectroscopy studies were conducted to gain insight into the effect of annealing on the crystal structure and local moisture adsorption.

关键词： Aerosol deposition Functional ceramic thick films Energy storage Structural characterization

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