Enwei Sun

Harbin Institute of Technology

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Wenwu Cao

University of Science and Technology Beijing

Bin Yang

Hubei University

Rui Zhang

Harbin Institute of Technology

Xudong Qi

Harbin Normal University

Kai Li

Changchun Institute of Applied Chemistry

Huashan Zheng

Harbin Institute of Technology

Yixiao Yang

Shanghai Fudan Microelectronics (China)

Limei Zheng

Shandong University

Fengmin Wu

Harbin University of Science and Technology

Jiaming Li

Zhongkai University of Agriculture and Engineering

Cooperative Institutions

Harbin Institute of Technology

Chinese Academy of Sciences

Jilin University

Wuhan Engineering Science & Technology Institute

Harbin University

Pennsylvania State University

State Key Laboratory of Superhard Materials

University of Science and Technology of China

Huizhou University

University of Chinese Academy of Sciences

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Improving performances of array ultrasonic transducer by alternating current poling method

Sensors and Actuators A Physical (2022)

Jinpeng Ma Linjing Liu Ke Zhu Da Huo Bingzhong Shen

Poling

10.1016/j.sna.2022.114066

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Multifunctional Sm3+ modified layered perovskite La2Ti2O7 single crystals: Enhanced piezoelectric performance and color-stable orange emission

Applied Physics Letters (2024)

Yunqi Ji Xiaohan Wang Runru Liu Wenwei Ge Enwei Sun

The demand for multifunctional materials with optical and electrical properties in industrial high-temperature applications has witnessed a rapid upsurge. Among ultra-high Curie temperature perovskite-like layered structure piezoelectrics, La2Ti2O7 (LTO) single crystal possesses the highest piezoelectric coefficient, but the lack of luminescence limits its optical applications. In this work, by combining experiments and first-principles calculations, we find that Sm3+ doped LTO single crystals not only create strong orange emission with high-color-purity and high-color-stability under high temperature/pressure, but also achieve higher piezoelectric coefficient of 21.7 pC/N at 298 K and 25.6 pC/N at 773 K, accompanied by polarization enhancement originating from inner TiO6 octahedral twisting. In addition, systematic high-temperature in situ electrical measurements showed that Sm3+ doping also contributes to weakening the adverse effects of ferroelectric–ferroelectric phase transition on piezoelectricity, dielectricity, and conductivity. Our work provides insights into the performance optimization mechanisms of ultra-high Curie temperature piezoelectrics and paves the way for the development of high-performance electro-optic integrated and coupled devices for applications under extreme conditions.

10.1063/5.0244121

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Performance enhancement of 1–3 piezoelectric composite materials by alternating current polarising

Ceramics International (2021)

Jinpeng Ma Ke Zhu Da Huo Bingzhong Shen Yang Liu

Poling

Electromechanical coupling coefficient

Alternating current

10.1016/j.ceramint.2021.03.163

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Citations (16)

Complete set of material properties of [011]c poled 0.24Pb(In1/2Nb1/2)O3–0.46Pb(Mg1/3Nb2/3)O3–0.30PbTiO3 single crystal

Materials Letters (2011)

Enwei Sun Wenwu Cao Pengdi Han

Crystal (programming language)

Electromechanical coupling coefficient

10.1016/j.matlet.2011.06.013

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Citations (16)

Optimization of electrooptic and pieozoelectric coupling effects in tetragonal relaxor-PT ferroelectric single crystals

Journal of Alloys and Compounds (2015)

Enwei Sun Shijing Sang Zhongyuan Yuan Xudong Qi Rui Zhang

Tetragonal crystal system

10.1016/j.jallcom.2015.04.006

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Citations (7)

Piezoelectric Enhancement and Mechanism in Defect Dipole-Engineered Sr2Nb2O7 Crystals

Xiaohan Wang Xiaohe Li Runru Liu Fujun Liu Enwei Sun

10.2139/ssrn.5024833

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Comprehensive optimization of piezoelectric coefficient and depolarization temperature in Mn-doped Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3-BaTiO3 lead-free piezoceramics

Journal of Material Science and Technology (2023)

Huashan Zheng Enwei Sun Huajie Luo Xiaoyu Zhang Yixiao Yang

Tetragonal crystal system

10.1016/j.jmst.2023.06.043

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Citations (8)

Effect of Mn-doping on dielectric relaxation behavior of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 ferroelectric ceramics

Ceramics International (2017)

Xudong Qi Enwei Sun Rui Zhang Bin Yang Shiyang Li

Hysteresis

Ferroelectric ceramics

Atmospheric temperature range

10.1016/j.ceramint.2017.09.079

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Citations (22)

Temperature Dependence of Normalized Sensitivity of Love Wave Sensor of Unidirectional Carbon Fiber Epoxy Composite on Mn-Doped 0.24PIN-0.46PMN-0.30PT Single Crystal Substrate

Applied Sciences (2020)

Naixing Huang Enwei Sun Rui Zhang Bin Yang Jian Liu

Love wave sensors have attracted significant interest due to their high sensitivity and low attenuation. Love mode acoustic dispersion relation, highest normalized mass sensitivity, optimum normalized waveguide layer thickness, and temperature coefficients of frequency (TCF) were theoretically studied for the carbon fiber epoxy composites (CFEC)/Mn:0.24PIN-0.46PMN-0.30PT structure sensor. The highest normalized mass sensitivity exhibits a decreasing trend as the temperature increases from 25 °C to 55 °C. TCF can be improved by increasing the normalized layer thickness (h/λ); however, the temperature dependence of normalized mass sensitivity decreases. For the carbon fibers (CFs) in the CFEC waveguide along the propagation direction of Love wave, the device has a relatively small TCF of −10.92 ppm/°C at h/λ = 0.4001, where the normalized mass sensitivity is approximately 1.5 times that of a typical fused quartz/ST-quartz configuration device. The theoretical results imply that good temperature stability and high measurement precision were obtained from the device in the system CFEC/Mn:0.24PIN-0.46PMN-0.30PT with the CFs in the CFEC along the propagation direction of Love wave (x-axis). The ideal waveguide material requires a small elastic constant c44; however, the ideal piezoelectric substrate requires large elastic constants c44E and c66E.

Quartz Crystal Microbalance

Dispersion relation

10.3390/app10238442

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Citations (2)

Theoretical study on local domain pinning effect due to defect dipole alignment

Journal of Physics D Applied Physics (2018)

Chao Yang Enwei Sun Bin Yang Wenwu Cao

We have theoretically studied the domain pinning effect from the internal bias field generated by aligned dipolar defects. By ordering defect dipoles along the polarization direction, the experimentally observed 'hard' properties in ferroelectric materials, including shifted polarization–electric field (P–E) loops, biased strain-electric field (S–E) loops, suppressed piezoelectric and dielectric responses in sufficiently poled and aged ferroelectric system, can be well described by our model. As expected, the P–E loops and S–E loops become more asymmetric with the increase of defect concentration. The local domain evolution around dipolar defects under an electric field shows the physical process for the domain pinning effect, i.e. the difficulty of domain switching due to the presence of defect dipoles. Finally, the domain memory effect during heating/cooling cycle is simulated. Interestingly, domain configuration can be memorized when a ferroelectric system with dipolar defects goes through the ferro-para-ferro phase transition cycle, and the simulated time steps of domain recovery are strongly correlated with the defect dipole concentration. All theoretical results from our model are consistent with the experimental results. We can conclude that the local interaction between dipole defects and domains is the main mechanism of ferroelectric hardening.

10.1088/1361-6463/aadcd4

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Citations (28)