Article
Multidisciplinary Sciences
Jinfeng Liu, Xiangyu Gao, Haonan Jin, Kaile Ren, Jingyu Guo, Liao Qiao, Chaorui Qiu, Wei Chen, Yuhang He, Shuxiang Dong, Zhuo Xu, Fei Li
Summary: This study proposes an orderly stacked structure to achieve all nonzero piezoelectric coefficients and generate artificially coupled multi-vibration modes with ultrahigh strains. A miniature ultrasonic motor based on this structure exhibits a high velocity per volume and a significantly improved moving resolution.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Hongjiang Li, Hao Chen, Xu Li, Jie Xing, Wenbin Liu, Zhi Tan, Mingyue Mo, Ning Chen, Manjing Tang, Jianguo Zhu
Summary: A composite material composed of 0.957(K0.48Na0.52)Nb0.94Ta0.06O3-0.04(Bi0.5Na0.5)ZrO3-0.003BiFeO3 (KNNT-BNZ-BFO) matrix and K4CuNb8O23 (KCN) phase was developed using a two-step ball-milling method. The composite material exhibited a high mechanical quality factor (Q(m)) and a decrease in remnant polarization and dielectric constant, as well as an increase in resistivity. This hardening effect can be attributed to the mechanical clamping effect and domain wall pegging at the KNNT-BNZ-BFO/KCN interface.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Yunting Cheng, Wenchou Fan, Hao Chen, Lixu Xie, Jie Xing, Zhi Tan, Jianguo Zhu
Summary: Potassium sodium niobate (KNN) ceramics are the most promising lead-free piezoelectric ceramics to replace lead zirconate titanate (PZT) ceramics. They have been widely studied for their application prospects in various electronic devices. The aim is to increase Qm while maintaining high piezoelectric activity in ultrasonic devices. The study shows that a KNN-based ceramic with high d33 and Qm can be prepared using a conventional solid-state technique. The formation of defect dipoles helps stabilize the ferroelectric order and hinder polarization rotation.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Zhenyong Cen, Fuzhi Cao, Meiyi Feng, Ziting Li, Ze Xu, Gengguang Luo, Nengneng Luo, Kaizhong Xie, Longtu Li, Xiaohui Wang
Summary: Piezoelectric strain and temperature stability of KNN-based ceramics sintered in reducing atmosphere are simultaneously improved through defects design of Mn doping. MnO and MnO2 impact the defects in KNN-based ceramics. Switchable defect dipoles in the ceramics enhance the reversibility of the non-180° domains switching and significantly improve the piezoelectric strain. The stable defect dipoles preserve the reversibility of the non-180° domains switching at high temperature, achieving large piezoelectric strain and excellent temperature stability.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Larissa Wahl, Juliana Gabriele Maier, Samuel Schmiedeke, The-An Pham, Tobias Fey, Kyle Grant Webber, Nahum Travitzky, Neamul Hayet Khansur
Summary: The small-signal dielectric and piezoelectric coefficients of paper-derived sodium potassium niobate (KNN) were compared with conventionally prepared samples. The results showed similar functional properties and crystal structure between the two, but a decrease in the temperature-dependent inter-ferroelectric phase transition temperature was observed in the paper-derived KNN, possibly due to structural and microstructural defects. Optimizing suspension chemistry and sintering conditions is crucial to enhance the functional response of paper-derived KNN. Paper-derived ceramic processing is a cost-effective technology that can be used to fabricate other electroceramics with various porosities, sizes, and complex geometries.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Salman Ali Khan, Tauseef Ahmed, Muhammad Habib, Fazli Akram, Jihee Bae, Tae Kwon Song, Dong Hwan Lim, Soon-Jong Jeong, Myong-Ho Kim, Soonil Lee
Summary: Introducing BNSTNZ into BF35BT ceramics resulted in a shift from normal-ferroelectric to relaxor-ferroelectric phase, leading to high dynamic piezoelectric coefficient and relatively high static piezoelectric coefficient at the optimum composition. This composition shows great potential for high-temperature piezoelectric applications due to its enhanced field-induced strain response.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Nanoscience & Nanotechnology
Wugang Wang, Zhengran Chen, Zhiyong Zhou, Yaoguo Li, Ruihong Liang
Summary: High-temperature poling, a poling method based on acceptor doping, is implemented to achieve a balance between the piezoelectric coefficient d33 and mechanical quality factor Qm of perovskite oxide ceramics. Compared to traditional poling, high-temperature poling significantly increases the piezoelectric coefficient d33 and mechanical quality factor Qm. This study provides insights into the design of high-power piezoelectric ceramics with high d33 and Qm.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Anjiang Li, Yuesong Li, Ronglian Li, Qi Sun, Yuanyu Wang
Summary: High piezoelectric-magnetic coupling was achieved in a (1-x)(K0.5Na0.5)NbO3-xFe2O3 piezoelectric ceramic by combining solution synthesis and a conventional solid-reaction method. This ceramic exhibited higher remanent magnetization and remanent polarization compared to reported perovskite-type multiferroelectric ceramics, and also possessed higher piezoelectric constants than KNN due to the formation of smaller domains at the nanoscale.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Min Li, Jin Luo, Tao Zhang, Yunfei Liu, Yinong Lyu
Summary: In this study, (0.95-x)K0.48Na0.52NbO3-0.05SrTiO(3)-xCaZrO(3) piezoelectric ceramics were prepared and their microstructures, phase structures, and ferroelectric, dielectric, and strain properties were investigated. The crystal structure of the ceramics changed from orthogonal-tetragonal coexistence to tetragonal-orthogonal coexistence by improving the transition temperature with increasing CaZrO3 doping. These materials exhibited a high electric field-induced strain and excellent ferroelectric and dielectric properties, making them promising candidates for lead-free ceramics in the future.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Hong Tao, Jie Yin, Chunlin Zhao, Jiagang Wu
Summary: This study reveals the frequency-dependent domain response, dwell-time dependence of domain radius, and voltage-dependent domain switching in KNN-based ceramics, further illustrating the contribution of relaxor behavior to high piezoelectricity. An improved temperature stability is observed at 30-60 degrees C for relaxor R-T phase, providing a new perspective in the mechanism of high-performance lead-free piezoelectrics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Yining Xie, Jie Xing, Zhi Tan, Lixu Xie, Yuan Cheng, Xiaojun Wu, Ruilin Han, Qiang Chen, Jianguo Zhu
Summary: Research has been conducted to enhance the piezoelectricity of KNN ceramics as a more eco-friendly alternative to PZT. However, high-performance KNN ceramics often suffer from low mechanical quality factors, leading to excessive dielectric loss. This study successfully improves the mechanical quality factor of KNN ceramics by constructing phase boundaries and inducing oxygen vacancies, resulting in ceramics with high Qm, high piezoelectric performance, and outstanding temperature stability.
CERAMICS INTERNATIONAL
(2022)
Article
Instruments & Instrumentation
Omar El Khatib, Meinhard Kuna, Sergey Kozinov
Summary: This study investigates the thermal effects on the fracture behavior of ferroelectric ceramics, analyzing potential failure modes of ferroelectric devices under extreme electromechanical conditions.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Mechanics
Weidong Yang, Mingjia Liu, Siyu Chen, Wenbin Kang, Junwei Chen, Yan Li
Summary: This work proposes a self-sensing actuating composite structure for constructing an electrostatic torsional actuator. The composite nanobeams, modeled based on strain gradient theory, are capable of self-adjusting the pull-in tilting angle of the micro-actuator considering size dependency and damage. Theoretical and numerical results show good agreement and validate the accuracy of the proposed model. By introducing piezoelectric layers into laminated torsional structures, the working state and damage of the device can be sensed and driven by piezoelectric effect, enabling the adjustment and prediction of stability to avoid pull-in instability. This work contributes to the structural optimization of electromechanical devices.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Zu'an Ding, Zhaojun Yang, Chuanhai Chen, Weizheng Chen, Hu Chen, Zhifeng Liu
Summary: This study proposes a highly versatile and robust ISLDMC controller to effectively address challenges such as the complex dynamic model of the spindle loading system and difficulty in obtaining parameters. By using dynamic correction coefficients and introducing the state equation, the controller's robustness and performance are enhanced, improving tracking characteristics. Experimental results demonstrate that ISLDMC outperforms other controllers in force tracking, anti-disturbance, and linear compensation capabilities, highlighting its excellent performance and characteristics.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Construction & Building Technology
Jun Deng, Xiaoda Li, Miaochang Zhu, Khuram Rashid, Qiang Wang
Summary: This study applied an electromechanical impedance (EMI) method based on piezoelectric ceramic to detect damage at the CFRP-concrete interface, and found that two damage indices obtained from the EMI method can clearly capture the process of damage development. Compared to the wave-based method, the EMI method is more sensitive to incipient concrete and debonding damage, confirming its practicality for on-site applications.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
