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| 1 | One-dimensional photonic bandgap structure in abalone shell显示文摘 | LI Bo ZHOU Ji LI Longtu LI Qi HAN Shuo HAO Zhibiao | 2005 | Chinese Science Bulletin2005，50，14： | 6 |
| 2 | Practical high-performance lead-free piezoelectrics:structural flexibility beyond utilizing multiphase coexistence显示文摘Due to growing concern for the environment and human health, searching for high-performance lead-free piezoceramics has been a hot topic of scientific and industrial research. Despite the significant progress achieved toward enhancing piezoelectricity, further efforts should be devoted to the synergistic improvement of piezoelectricity and its thermal stability. This study provides new insight into these topics.A new KNN-based lead-free ceramic material is presented, which features a large piezoelectric coefficient(d33) exceeding 500 pC/N and a high Curie temperature(Tc) of ~200℃. The superior piezoelectric response strongly relies on the increased composition-induced structural flexibility due to lattice softening and decreased unit cell distortion. In contrast to piezoelectricity anomalies induced via polymorphic transition, this piezoelectricity enhancement is effective within a broad temperature range rather than a specific small range. In particular, a hierarchical domain architecture composed of nano-sized domains along the submicron domains was detected in this material system, which further contributes to the high piezoelectricity. | Qing Liu Yichi Zhang Jing Gao Zhen Zhou Dong Yang Kai-Yang Lee Andrew Studer Manuel Hinterstein Ke Wang Xiaowen Zhang Longtu Li Jing-Feng Li | 2020 | National Science Review2020，7，2： | 5 |
| 3 | Ferroelectricity of nanocrystalline BaTiO_3 ceramics by first principle calculation显示文摘The vibrational modes of BaTiO3 in different crystalline phases have been investigated by means of density functional theory pseudo potential method.The evidence of tetragonal to orthorhombic and orthorhombic to rhombohedral phase transitions present for 8 nm BaTiO3 ceramics further demonstrates that the similar successive transitions in 8 nm BaTiO3 ceramics from rhombohedral to orthorhombic,tetragonal and cubic transitions are as those in coarse BaTiO3 ceramics. | DENG XiangYun ZHANG HaiTao LI Ting LI DeJun LI JianBao WANG XiaoHui LI LongTu | 2010 | Chinese Science Bulletin2010，55，20： | 4 |
| 4 | Perspectives and challenges for lead-free energy-storage multilayer ceramic capacitors显示文摘The growing demand for high-power-density electric and electronic systems has encouraged the development of energy-storage capacitors with attributes such as high energy density,high capacitance density,high voltage and frequency,low weight,high-temperature operability,and environmental friendliness.Compared with their electrolytic and film counterparts,energy-storage multilayer ceramic capacitors(MLCCs)stand out for their extremely low equivalent series resistance and equivalent series inductance,high current handling capability,and high-temperature stability.These characteristics are important for applications including fast-switching third-generation wide-bandgap semiconductors in electric vehicles,5G base stations,clean energy generation,and smart grids.There have been numerous reports on state-of-the-art MLCC energy-storage solutions.However,lead-free capacitors generally have a low-energy density,and high-energy density capacitors frequently contain lead,which is a key issue that hinders their broad application.In this review,we present perspectives and challenges for lead-free energy-storage MLCCs.Initially,the energy-storage mechanism and device characterization are introduced;then,dielectric ceramics for energy-storage applications with aspects of composition and structural optimization are summarized.Progress on state-of-the-art energy-storage MLCCs is discussed after elaboration of the fabrication process and structural design of the electrode.Emerging applications of energy-storage MLCCs are then discussed in terms of advanced pulsed power sources and high-density power converters from a theoretical and technological point of view.Finally,the challenges and future prospects for industrialization of lab-scale lead-free energy-storage MLCCs are discussed. | Peiyao ZHAO Ziming CAI Longwen WU Chaoqiong ZHU Longtu LI Xiaohui WANG | 2021 | Journal of Advanced Ceramics2021，10，6： | 3 |
| 5 | Energy storage properties of 0.87BaTiO3-0.i3Bi(Zn2/3(Nb0.85Ta0.15)1/3)O3 multilayer ceramic capacitors with thin dielectric layers显示文摘Multilayer ceramic capacitors(MLCCs)for energy storage applications require a large discharge energy density and high discharge/charge efficiency under high electric fields.Here,0.87BaTiO3--0.13Bi(Zn23(Nbog8sTao.1s)u3)O3(BTBZNT)MLCCs with double active dielectric layers were fabricated,and the effects of inner electrode and sintering method on the energy storage properties of BTBZNT MLCCs were investigated.By using the pure Pt as inner electrode instead of Ago.6Pdo4 aloys,an alternating current(AC)breakdown strength(BDS)enhancement from 1047 to 1500 kV/cm was achieved.By investigating the leakage current behavior of BTBZNT MLCCs,the Pt inner electrode and two-step sintering method(TSS)were confirmed to enhance the Schottky barrier and minimize the leakage current density.With relatively high permitivity,dielectric sublinearity,and ultra-high BDS,the Pt TSS BTBZNT MLCCs exhibited a surprisingly discharge energy density(Udis)of 14.08 J/cm2.Moreover,under an operating electric field of 400 kV/cm,the MLCCs also exhibited thermal stability with Udis variation<±8%over a wide temperature (t) range from-50 to 175℃ and cycling reliability with Uais reduction<0.3%after 3000 charge-discharge cycles.These remarkable performances make Pt TSS BTBZNT MLCCs promising for energy storage applications. | Hongxian WANG Peiyao ZHAO Lingling CHEN Longtu LI Xiaohui WANG | 2020 | Journal of Advanced Ceramics2020，9，3： | 3 |
| 6 | Isotropic negative permeability composite based on Mie resonance of the BST-MgO dielectric medium显示文摘Isotropic negative permeability composite,composed of BST-MgO dielectric cubes with high permit-tivity dispersed in the Teflon substrate with low permittivity,was designed and fabricated based on Mie resonance and the effective medium theory.Measurements and simulations showed that the dielectric composite exhibited a strong sub-wavelength magnetic resonance at the first Mie resonance and possessed isotropic negative permeability,which resulted from the displacement current excited in the cubes.The dielectric particle was equivalent to a magnetic dipole at the magnetic resonance,which could be adjusted by the size and permittivity of the particles.It may provide a convenient method to design isotropic metamaterials and invisible cloak at infrared and visible frequencies. | ZHAO Qian KANG Lei DU Bo ZHAO HongJie XIE Qin LI Bo ZHOU Ji LI LongTu MENG YongGang | 2008 | Chinese Science Bulletin2008，53，21： | 3 |
| 7 | Enhancement of second-order harmonic generation in polarized BaTiO_3 thin films embedded with Ag nanoparticles显示文摘RECENTLY, much attention has been paid to optical properties of ferroelectric thin films. Be- | ZHOU Ji, LI Longtu, GUI Zhilun, ZHANG Xiaowen, K. M. Moulding and D. J. Barber1 Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2 Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China | 1997 | Chinese Science Bulletin1997，42，15： | 2 |
| 8 | Grain Size Effects on Piezoelectric Properties and Domain Structure of BaTiO 3 Ceramics Prepared by Two‐Step Sintering显示文摘 | Yu Huan Xiaohui Wang Jian Fang Longtu Li | 2013 | J. Am. Ceram. Soc2013，，11： | 2 |
| 9 | 显示文摘 | Zhang Xiaowen Li Longtu | 1997 | Functional Materials1997，28，3： | 1 |
| 10 | The resonance vibration properties of abimorph flexural piezoelectric ultrasonic transducer for distance measurement显示文摘 | HU Xiaobing LI Longtu CHU Xiangcheng | 2003 | Materials Science and Engineering2003，99，： | 1 |
| 11 | The design and test of a new kind of piezoelectric motor based on standing wave and multilayer显示文摘 | CHU Xiangcheng MENG Xiangyu LI Longtu | 2010 | Ferroelec- trics2010，409，1： | 1 |
| 12 | A New Type of Linear Piezoelectric Stepper Motor,显示文摘 | Li Longtu | 1995 | IEEE Transactions on Components Packaging and Manufacturing Technology-Part A1995，18，2： | 1 |
| 13 | Preparation and characterization of NiCuZn ferrite nanocrystalline powders by auto-combustion of nitrate-citrate gels 显示文摘 | YUE Zhenxing LI Longtu ZHOU Ji | 1999 | Mater Sci Eng1999，64，： | 1 |
| 14 | Modulation effect of Mn2+on dielectric properties of Ba Ti O3-based X7R显示文摘 | Li Longtu Zhao Jianqiang Gui Zhilun | 2000 | Materials Letters2000，，： | 1 |
| 15 | 显示文摘 | Yue Zhenxing Zhou Ji Li Longtu | 2000 | Journal of Magnetism and Magnetic Materials2000，208，： | 1 |
| 16 | 显示文摘 | Wang Xiaohui Li longtu Yue Zhenxing | 2002 | J Magn Magn Mater2002，246，3： | 1 |
| 17 | Low - temperature sintering and high frequency properties of Cu- modified Co2Z hexaferrite 显示文摘 | Xiaohui Wang Longtu Li Shuiyuan Su Zhilun Gui | 2003 | J European Ceramic Society2003，23，： | 1 |
| 18 | Preparation and characterization of NiCuZn ferrite nanocrystalline powders by auto-combustion of nitrate-citrate gels显示文摘 | Longtu Li Ji Zhou | 1999 | Materials Science and Engineering1999，，64： | 1 |
| 19 | Microstructure and densification mechanism of low temperature sintering Bi-Substituted yttrium iron garnet显示文摘 | Hongjie Zhao Ji Zhou Bo Li Zhilun Gui Longtu Li | 2008 | Journal of Electroceramics (-)2008，，1： | 1 |
| 20 | Temp raturestable Bal-xCdxTiO3 die- leetries显示文摘 | Jianquan Qi Zhilun Gui Wen Li Yongli Wang Yajing Wu Longtu Li | 2002 | Materials Letters2002，56，： | 1 |
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