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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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Spatially-resolved relaxor to ferroelectric phase switching in 0.93Na_(1/2)Bi_(1/2)TiO_(3)-0.07BaTiO_(3) ceramics

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Journal of Materiomics 2022年第5期8卷 976-981页

作者： Xi Shi Udo Eckstein Yizhe Li David hall neamul h.khansur Department of Materials Science and Engineering Friedrich-Alexander-University Erlangen-Nürnberg(FAU)ErlangenGermany Department of Materials University of ManchesterManchesterUK

In situ,spatially-resolved synchrotron X-ray diffraction was utilized to investigate the electric fieldinduced heterogenous phase transformation of nonergodic relaxor 0.93Na^(1/2)Bi^(1/2)TiO_(3)-0.07BaTiO_(3) ceramics.A Cu electrode was coated on one surface of a rectangular sample by aerosol deposition(AD),while a Pt layer was deposited on the opposite surface by sputter *** is anticipated that a different stress state and/or domain morphology should occur on the AD deposited Cu electrode side due to the particle impact-consolidation deposition *** an electric field,different sample regions,i.e.,AD,Middle,and Sputter sides,showed systematic changes in the relaxor to ferroelectric phase transition *** particular,mostgrains transformed at a sub-coercive field of 0.8 kV/mm,while the majority of thegrains only appeared to undergo transitions at a higher field(2.4 kV/mm).Also,the tetragonal phase became the dominant structure at higher field ***,bothandgrains undergo phase switching at lower fields in the region close to the AD-processed *** study indicates that the AD process-induced stress can facilitate the electric field-induced relaxor to ferroelectric phase transition,i.e.,the AD Cu side showed more significant lattice strain and domain texture than the sputter Pt side.

关键词： Relaxor ferroelectric Synchrotron X-ray diffraction Phase transformation

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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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