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Excellent energy storage performance in Bi_(0.5)Na_(0.5)TiO_(3)-based lead-free high-entropy relaxor ferroelectrics via B-site modification

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Journal of Advanced Ceramics 2024年第3期13卷 345-353页

作者： Kaihua Yang gengguang luo Li Ma Ruoxuan Che Zhiyi Che Qin Feng Zhenyong Cen Xiyong Chen Jiajun Zhou Nengneng luo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China School of Optical and Electronic Information Key Lab of Functional Materials for Electronic Information(B)of Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074China

Next-generation advanced high/pulsed power capacitors urgently require dielectric materials with outstanding energy storage ***_(0.5)Na_(0.5)TiO_(3)-based lead-free materials exhibit high polarization,but the high remanent polarization and large polarization hysteresis limit their applications in dielectric ***,high-entropy perovskite relaxor ferroelectrics(Na_(0.2)Bi_(0.2)Ba_(0.2)Sr_(0.2)Ca_(0.2))(Ti1-x%Zrx%)O_(3)are designed by adding multiple ions in the A-site and replacing the B-site Ti^(4+)with a certain amount of Zr^(4+).The newly designed system showed high relaxor feature and slim polarization-electric(P-E)***,improved relaxor feature and obviously delayed polarization saturation were found with the increasing of Zr^(4+).Of particular importance is that both high recoverable energy storage density of 6.6 J/cm^(3) and energy efficiency of 93.5%were achieved under 550 kV/cm for the ceramics of x=6,accompanying with excellent frequency stability,appreciable thermal stability,and prosperous discharge *** work not only provides potential dielectric materials for energy storage applications,but also offers an effective strategy to obtain dielectric ceramics with ultrahigh comprehensive energy storage performance to meet the demanding requirements of advanced energy storage applications.

关键词： energy storage density (Bi_(0.5)Na_(0.5))TiO_(3) high-entropy perovskite ceramics polarization saturation relaxor ferroelectrics(RFEs)

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High energy storage density in NaNbO_(3) antiferroelectrics with double hysteresis loop

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Journal of Materiomics 2024年第5期10卷 1026-1035页

作者： Li Ma Zhenpei Chen gengguang luo Zhiyi Che Chao Xu Dongliang Shan Zhenyong Cen Qin Feng Xiyong Chen Toyohisa Fujita Ye Zhu Yunya Liu Jing-Feng Li Shujun Zhang Nengneng luo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning530004China School of Chemistry and Chemical Engineering Guangxi UniversityNanning530004China Department of Applied Physics Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan411105HunanChina State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongWollongongNSW2500Australia

Antiferroelectrics(AFEs)possess great potential for high performance dielectric capacitors,due to their distinct double hysteresis loop with high maximum polarization and low remnant ***,the well-known NaNbO3 lead-free antiferroelectric(AFE)ceramic usually exhibits square-like P–E loop related to the irreversible AFE P phase to ferroelectric(FE)Q phase transition,yielding low recoverable energy storage density(Wrec).Herein,significantly improved Wrec up to 3.3 J/cm^(3) with good energy storage efficiency(η)of 42.4% was achieved in Na_(0.7)Ag_(0.3)Nb_(0.7)Ta_(0.3)O_(3)(30Agsingle bond30Ta)ceramic with well-defined double P–E loop,by tailoring the A-site electronegativity with Ag+and B-site polarizability with Ta^(5+).The Transmission Electron Microscope,Piezoresponse Force Microscope and in-situ Raman spectra results verified a good reversibility between AFE P phase and high-field-induced FE Q *** improved stability of AFE P phase,being responsible for the double P–E loop and improved Wrec,was attributed to the decreased octahedral tilting angles and cation *** mechanism was revealed by synchrotron X-ray diffraction and Scanning Transmission Electron *** work provides a good paradigm for achieving double P–E loop and high energy storage density in NaNbO_(3)-based ceramics.

关键词： Sodium niobate Antiferroelectrics Double hysteresis loop Energy storage performance Reversibility

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铌酸钠基陶瓷的相界调控及储能性能

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硅酸盐学报 2024年第4期52卷 1392-1402页

作者：常凡罗庚光罗能能省部共建特色金属材料与组合结构全寿命安全国家重点实验室广西大学资源环境与材料学院南宁530004

铌酸钠(NaNbO_(3))基无铅陶瓷具有超高的储能密度,在高功率介电储能电容器领域引起了广泛关注。然而,纯NaNbO_(3)陶瓷在室温表现为矩形形状的类铁电电滞回线,并伴随着大的回滞和高的剩余极化强度,往往导致大的能量损耗。为优化NaNbO_(3... 详细信息

铌酸钠(NaNbO_(3))基无铅陶瓷具有超高的储能密度,在高功率介电储能电容器领域引起了广泛关注。然而,纯NaNbO_(3)陶瓷在室温表现为矩形形状的类铁电电滞回线,并伴随着大的回滞和高的剩余极化强度,往往导致大的能量损耗。为优化NaNbO_(3)的储能性能,基于相界调控策略采用传统固相法制备了(1–x)NaNbO_(3)–xCaTiO_(3)(0.08≤x≤0.18)陶瓷,并使用CuO作为助烧剂。结果表明,该体系在0.09≤x≤0.16范围内存在因晶体结构改变而引起的多晶型相界区域,其中相界组分0.84NaNbO_(3)–0.16CaTiO_(3)在590 kV/cm时的最大极化强度为42.2μC/cm^(2),可逆储能密度达到6.1 J/cm^(3),储能效率为77%。同时该陶瓷表现出良好的频率和温度稳定性,以及优异的放电性能。为铌酸钠基高性能储能电容器材料的开发提供了新思路。

关键词：铌酸钠多晶型相界弛豫特性储能性能

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Phase engineering in NaNbO_(3) antiferroelectrics for high energystorage density

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Journal of Materiomics 2022年第4期8卷 753-762页

作者： Zhengu Chen Shuaifei Mao Li Ma gengguang luo Qin Feng Zhenyong Cen Fujita Toyohisa Xiuning Peng Laijun Liu Huanfu Zhou Changzheng Hu Nengneng luo School of Chemistry&Chemical Engineering Guangxi UniversityNanning530004China Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning530004China Center on Nanoenergy Research School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning530004China School of Civil Engineering and Architecture Guangxi UniversityNanning530004China College of Materials Science and Engineering Guilin University of TechnologyGuilin541004China

The NaNbO_(3) antiferroelectrics have been considered as a potential candidate for dielectric capacitorsapplications. However, the high-electric-field-unstable antiferroelectric phase resulted in low energystorage density and efficiency. Herein, good energy storage properties were realized in (1-x)NaNbO_(3)- xNaTaO_(3) ceramics, by building a new phase boundary. As a result, a high recoverable energy density(Wrec) of 2.2 J/cm3 and efficiency (h) of 80.1% were achieved in 0.50NaNbO_(3)-0.50NaTaO_(3) ceramic at300 kV/cm. The excellent energy storage performance originates from an antiferroelectric-paraelectricphase boundary with simultaneously high polarization and low hysteresis, by tailoring the ratio ofantiferroelectric and paraelectric phases. Moreover, the 0.50NaNbO_(3)-0.50NaTaO_(3) ceramic also exhibitedgood temperature and frequency stability, together with excellent charge-discharge performance. Theresults pave a good way of designing new NaNbO_(3)-based antiferroelectrics with good energy storageperformance.

关键词： NaNbO_(3)ceramics Antiferroelectrics Paraelectrics Energy storage density Dielectric capacitors

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Preparation and energy storage properties of <001>-textured NaNbO_(3)-based ceramics

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Journal of Advanced Dielectrics 2023年第4期13卷 69-75页

作者： Zhengu Chen Fan Chang gengguang luo Li Ma Ju Chen Jinge Pei Zhenyong Cen Qin Feng Fujita Toyohisa Nengneng luo School of Chemistry&Chemical Engineering Guangxi University Nanning 530004P.R.China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of Resources Environment and MaterialsGuangxi UniversityNanning 530004P.R.China

Dielectric materials with high energy storage density(Wrec)and efficiency(η)are expected for energy storage *** this work,-textured Na0.7Bi0.1NbO_(3)(NBN)ceramics were prepared by a templated grain growth *** effects of microstructure and orientation degree on dielectric properties,polarization and energy storage performance were *** textured ceramic with an optimized orientation degree(70%)showed a high Wrec of 2.4 J/cm^(3) andηof 85.6%.The excellent energy storage properties of textured ceramic originate from the co-effect of interfacial polarization and clamping *** results indicate that texture development is a potential candidate to optimize the energy storage properties of functional ceramics.

关键词： NaNbO_(3) ceramics grain orientation energy storage density dielectric capacitors

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复合微生物在畜禽养殖中的应用与发展前景

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福建畜牧兽医 2020年第5期42卷 21-24页

作者：李兆龙刘金林陈新福李东娅罗锦义黄耿光福建省农业科学院畜牧兽医研究所福州350013 龙岩市农业学校福建龙岩364000 龙岩市瑞丰养殖有限公司福建上杭364200 泉州华惠生物科技有限公司福建泉州362000 南平市农业学校福建南平354200

微生物在农业生产尤其在畜牧生产中的应用非常广泛,对猪、禽、牛和兔等在营养物质的转化吸收、胃肠道平衡调整以及其它疾病的防治上发挥了积极的作用。本文通过对微生物的简述及功能作用的总结,以期推动复合微生物在畜牧业生产中的进一... 详细信息

微生物在农业生产尤其在畜牧生产中的应用非常广泛,对猪、禽、牛和兔等在营养物质的转化吸收、胃肠道平衡调整以及其它疾病的防治上发挥了积极的作用。本文通过对微生物的简述及功能作用的总结,以期推动复合微生物在畜牧业生产中的进一步应用。

关键词：微生物畜禽养殖发展前景

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