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Thermoelectromechanical instability of dielectric elastomer undergoes polarization saturation and temperature variation

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Acta Mechanica Sinica 2021年第3期37卷 414-421,I0001页

作者： Yaguang Guo Liwu Liu Yanju Liu Jinsong Leng Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbin 150001.China Center for Composite Materials and Structures Science Park of Harbin Institute of TechnologyHarbin 150080China

When the electric field caused by voltage reaches a certain level,the charge on the compliant electrodes will not increase owing to the polarization saturation,which would limit the deformation of the dielectric *** experiments show that temperature also has a significant effect on the deformation of dielectric *** this work,a free energy model coupling temperature and polarization saturation is developed to characterize the thermoelectromechanical instability of dielectric *** results reveal that both the polarization saturation parameters and electric field have a significant influence on the actuation ability of the dielectric elastomer,and the increase of temperature enhances thermoelectromechanical *** is hoped that this work could guide the development of dielectric elastomer materials and application devices operating in variable temperatures.

关键词： Dielectric elastomer Thermoelectromechanical instability polarization saturation Temperature variation

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Extension limit,polarization saturation,and snap-through instability of dielectric elastomers

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International Journal of Smart and Nano Materials 2011年第2期2卷 59-67页

作者： Bo Li Liwu Liu Zhigang Suo School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an710049 PRC School of Engineering and Applied Sciences Kavli Institute for Bionano Science and TechnologyHarvard UniversityCambridgeMA 02138USA Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbin 150001PRC

A dielectric elastomer is capable of large voltage-induced deformation,particularly when the voltage is applied on the verge of snap-through instability.A model is described which shows that the snap-through instability is markedly affected by both the extension limit of polymer chains and the polarization saturation of *** model may guide the search for high-performance dielectric elastomer transducers.

关键词： dielectric elastomer polarization saturation stabilization

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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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