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Large Energy Capacitive High-Entropy Lead-Free Ferroelectrics 被引量:3
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作者 Liang Chen Huifen Yu +5 位作者 Jie Wu shiqing deng Hui Liu Lifeng Zhu He Qi Jun Chen 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第5期69-82,共14页
Advanced lead-free energy storage ceramics play an indispensable role in next-generation pulse power capacitors market.Here,an ultrahigh energy storage density of~13.8 J cm^(-3)and a large efficiency of~82.4%are achie... Advanced lead-free energy storage ceramics play an indispensable role in next-generation pulse power capacitors market.Here,an ultrahigh energy storage density of~13.8 J cm^(-3)and a large efficiency of~82.4%are achieved in high-entropy lead-free relaxor ferroelectrics by increasing configuration entropy,named high-entropy strategy,realizing nearly ten times growth of energy storage density compared with low-entropy material.Evolution of energy storage performance and domain structure with increasing configuration entropy is systematically revealed for the first time.The achievement of excellent energy storage properties should be attributed to the enhanced random field,decreased nanodomain size,strong multiple local distortions,and improved breakdown field.Furthermore,the excellent frequency and fatigue stability as well as charge/discharge properties with superior thermal stability are also realized.The significantly enhanced comprehensive energy storage performance by increasing configuration entropy demonstrates that high entropy is an effective but convenient strategy to design new high-performance dielectrics,promoting the development of advanced capacitors. 展开更多
关键词 High-entropy Energy storage LEAD-FREE Relaxor ferroelectrics Capacitors
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High-performance ferroelectric based materials via high-entropy strategy:Design,properties,and mechanism 被引量:1
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作者 Yueyun Zhang Liang Chen +3 位作者 Hui Liu shiqing deng He Qi Jun Chen 《InfoMat》 SCIE CSCD 2023年第12期28-53,共26页
High-performance ferroelectric materials are widely used in various electronic devices owing to the function of mutual conversion among different energies,which mainly relates to their special structure gene of polari... High-performance ferroelectric materials are widely used in various electronic devices owing to the function of mutual conversion among different energies,which mainly relates to their special structure gene of polarization configuration.Recent researches show that the high-entropy strategy has emerged as an effective and flexible approach for boosting physical properties in high-entropy ferroelectrics via the delicate design of local polarization configurations and other intrinsic effects caused by entropy increment,such as entropy stabilization,lattice disorder,inhibition of grain coarsening,improved mechanical properties,cocktail effect,and so on.In this review,the recent research progress about high-entropy ferroelectrics has been summarized,especially for the directional design of novel local polarization configurations according to the characteristics of different electrical properties such as high piezoelectricity,high-efficiency energy storage,and large electrostriction,providing a guidance for designing and exploring more novel local polarization configurations in high-entropy ferroelectrics for generating higher performance. 展开更多
关键词 ferroelectric materials high performance high-entropy design local structure polarization configuration
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Design of superior electrostriction in BaTiO_(3) -based lead-free relaxors via the formation of polarization nanoclusters 被引量:1
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作者 Lu Wang He Qi +4 位作者 shiqing deng Lingzhi Cao Hui Liu Shuxian Hu Jun Chen 《InfoMat》 SCIE CAS CSCD 2023年第1期114-124,共11页
Electrostrictive materials have wide applications in modern high-precision electronic devices.Driven by growing environmental concerns,there is demand for lead-free materials with superior electrostriction behaviors.I... Electrostrictive materials have wide applications in modern high-precision electronic devices.Driven by growing environmental concerns,there is demand for lead-free materials with superior electrostriction behaviors.In this study,we demonstrate a record-high electrostrictive coefficient of~0.0712 m^(4) C^(-2) in perovskite ferroelectric ceramics,along with hysteresis-free strain as well as excellent frequency and thermal stabilities,in lead-free BaTiO_(3)-based ceramics through a polarization nanocluster design.By appro-priately introducing Li+and Bi^(3+)into the BaTiO 3 lattice matrix,the long-range ferroelectric ordering can be broken,and polarization nanoclusters can be formed,resulting in a relaxor state with concurrently suppressed polariza-tion and maintained electro-strain.A three-dimensional atomic model constructed using advanced neutron total-scattering data combined with the reverse Monte Carlo method indicates the existence of Bi and Li segregations at the subnanometer scale,which confirms the prediction made by density functional theory calculations.Such a short-range chemical order destroys the long-range ferroelectric order of the off-centered Ti polar displacements and leads to the embedding of Li+/Bi ^(3+)-rich polar nanoregions in the Ba^(2+)-rich polarization disorder matrix.Further,a completely reversible electric-field-induced lattice strain is observed,giving rise to pure electrostriction without hysteresis behavior.This work provides a novel strategy for developing lead-free relaxor ferroelectrics with high electrostriction performance. 展开更多
关键词 BaTiO_(3) electrostrictive effect local structure relaxor ferroelectrics
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Revealing structure behavior behind the piezoelectric performance of prototype lead-free Bi_(0.5)Na_(0.5)TiO_(3)-BaTiO_(3) under in-situ electric field
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作者 Huajie Luo Shiyu Tang +7 位作者 Hui Liu Zheng Sun Baitao Gao Yang Ren He Qi shiqing deng Houbing Huang Jun Chen 《Journal of Materiomics》 SCIE 2022年第6期1104-1112,共9页
Bi_(0.5)Na_(0.5)TiO_(3)-BaTiO_(3)(BNT-100xBT)ceramics are promising candidates for piezoelectric applications.The correlation between their structure and piezoelectric properties has attracted considerable interest.He... Bi_(0.5)Na_(0.5)TiO_(3)-BaTiO_(3)(BNT-100xBT)ceramics are promising candidates for piezoelectric applications.The correlation between their structure and piezoelectric properties has attracted considerable interest.Herein,the structures of 6BT and 7BT with distinct piezoelectricity are investigated via in-situ synchrotron X-ray diffraction and transmission electron microscopy.It is found that although both compositions present morphotropic phase boundary(MPB)features with coexisting R3c and P4bm phases,their refined structures are significantly different.6BT is composed of the R3c phase with a small P4bm fraction after electrical poling,while 7BT presents comparable fractions of the two phases.Less pronounced structure distortion and oxygen octahedral tilting occur in 7BT,which favor the phase transformation,resulting in an enhanced piezoelectricity.This enhancement driven by structural flexibility is elucidated by phenomenological analysis.These results demonstrate that the design of high piezoelectricity at MPBs should consider not only the phase-coexisting states but also the refined crystal structure. 展开更多
关键词 In-situ synchrotron X-ray diffraction Piezoelectric properties Crystal structure
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Relaxor antiferroelectric-relaxor ferroelectric crossover in NaNbO_(3)-based lead-free ceramics for high-efficiency large-capacitive energy storage
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作者 Shuangliang Xie Yuyue Chen +5 位作者 Qing He Liang Chen Jikun Yang shiqing deng Yimei Zhu He Qi 《Chinese Chemical Letters》 SCIE CAS 2024年第7期465-469,共5页
Relaxor ferroic dielectrics have garnered increasing attention in the past decade as promising materials for energy storage.Among them,relaxor antiferroelectrics(AFEs)and relaxor ferroelectrics(FEs)have shown great pr... Relaxor ferroic dielectrics have garnered increasing attention in the past decade as promising materials for energy storage.Among them,relaxor antiferroelectrics(AFEs)and relaxor ferroelectrics(FEs)have shown great promise in term of high energy storage density and efficiency,respectively.In this study,a unique phase transition from relaxor AFE to relaxor FE was achieved for the first time by introducing strong-ferroelectricity BaTiO_(3)into NaNbO_(3)-BiFeO_(3)system,leading to an evolution from AFE R hierarchical nanodomains to FE polar nanoregions.A novel medium state,consisting of relaxor AFE and relaxor FE,was identified in the crossover of 0.88NaNbO_(3)–0.07BiFeO_(3)–0.05BaTiO_(3)ceramic,exhibiting a distinctive core-shell grain structure due to the composition segregation.By harnessing the advantages of high energy storage density from relaxor AFE and large efficiency from relaxor FE,the ceramic showcased excellent overall energy storage properties.It achieved a substantial recoverable energy storage density W_(rec)~13.1 J/cm^(3)and an ultrahigh efficiencyη~88.9%.These remarkable values shattered the trade-off relationship typically observed in most dielectric capacitors between W_(rec)andη.The findings of this study provide valuable insights for the design of ceramic capacitors with enhanced performance,specifically targeting the development of next generation pulse power devices. 展开更多
关键词 Relaxor ferroelectric Antiferroelectric Core-shell Energy storage High efficiency
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