Article
Materials Science, Multidisciplinary
Zhe Wang, Jinyan Zhao, Gang Niu, Wei Ren, Nan Zhang, Kun Zheng, Yi Quan, Lingyan Wang, Jian Zhuang, Henghui Cai, Xin Li, Genshui Wang, Ming Liu, Zhuangde Jiang, Yulong Zhao
Summary: Lead-free bismuth sodium titanite (Bi0.5Na0.5)TiO3-based piezoelectric thin films, specifically (1 - x)(Bi0.5Na0.5)TiO3-xBaZrO(3) (x = 0.02, 0.04, 0.06 and 0.07, BNT-100xBZ) were successfully fabricated using the sol-gel method. The influence of the BZ contents on the dielectric and piezoelectric properties of the thin films was investigated. The results showed that the BNT-4BZ thin films exhibited a giant macro-scale strain value and a relatively lower dielectric loss, along with a coexistence of ferroelectric phase and relaxor characteristics. These findings are of great significance for improving the strain response and reducing the dielectric loss in lead-free thin films for various piezoelectric device applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Ceramics
Zhe Wang, Jinyan Zhao, Gang Niu, Nan Zhang, Kun Zheng, Yi Quan, Lingyan Wang, Jian Zhuang, Genshui Wang, Xin Li, Henghui Cai, Ming Liu, Zhuangde Jiang, Yulong Zhao, Wei Ren
Summary: In this work, high-quality (0.94-x%)(Bi0.5Na0.5)TiO3-0.06BaTiO3-x%NaNbO3 thin films were successfully deposited on Pt/TiO2/SiO2/Si substrates by sol-gel method. The BNT-6BT-6NN thin films showed an optimized strain response, which is attributed to a synergistic reaction of active domain switching and reversible electric-field-induced phase transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Faysal Naeem, Mohsin Saleem, Hamid Jabbar, Gulraiz Tanvir, Fiza Asif, Abrar H. Baluch, Muhammad Irfan, Abdul Ghaffar, Adnan Maqbool, Tayyab Rafiq
Summary: This work successfully synthesized lead-free piezoelectric ceramics 0.74(Bi0.5Na0.5TiO3)-0.26(SrTiO3) (BNT-ST26) and niobium-substituted (Nb-BNT-ST26), and confirmed the effect of niobium substitution on the perovskite phase structure of BNT-ST26 ceramics through X-ray diffraction and Raman spectra. Electromechanical properties revealed that addition of 0.5% niobium resulted in the optimal piezoelectric performance and dielectric effect, making it suitable for high-temperature, stable, frequency-dependent, lead-free piezoelectric devices.
Article
Materials Science, Multidisciplinary
Han Wang, Qiang Li, Yuxin Jia, Arun Kumar Yadav, Benben Yan, Qi Shen, Mengyuan Li, Qifeng Quan, Huiqing Fan
Summary: The lead-free relaxor ceramics BNTBT-100xYN were designed and prepared using traditional solid-state sintering technique. The introduction of complex ions improved the temperature stability and recoverable energy density of the ceramics. The addition of composition reduced activation energy and generated oxygen vacancies, showing ergodic relaxor behavior.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Ceramics
Han Wang, Qiang Li, Arun Kumar Yadav, Yuxin Jia, Benben Yan, Qifeng Quan, Qi Shen, Lin Lei, Weijia Wang, Huiqing Fan
Summary: The introduction of AgNbO3 dopants into BNBT-100xAN ceramics significantly improved their dielectric and piezoelectric properties, allowing them to perform well under high voltage and temperature conditions. XRD patterns and Raman spectra showed successful diffusion of AN modifiers into the lattice with a pseudo-cubic symmetry structure. These results demonstrate the potential of BNBT-100xAN ceramics for strain sensors and high-temperature capacitors.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Shiqi Zheng, Qiang Li, Yanqin Chen, Arun Kumar Yadav, Weijia Wang, Huiqing Fan
Summary: Lead-free BNTBT-100xAN ceramics with added AgNbO3 were successfully fabricated and their effects on fatigue resistance, energy-storage density, temperature-stable permittivity, and conductivity mechanism were investigated. The results showed that the addition of AgNbO3 led to improved dielectric breakdown strength and energy-storage density, as well as excellent fatigue-resistant performance and temperature stability, making it suitable for applications in electronic equipment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Crystallography
Zhe Wang, Jinyan Zhao, Wei Ren
Summary: This work investigates the influence of annealing conditions on the crystalline structure, morphology, and electrical performance of BNT-5.5BZ thin films. The results show that the post-annealing treatment in an O-2 atmosphere can significantly enhance the strain response and reduce the dielectric loss of the films. This research provides new insights into improving the electrical properties of BNT-based films.
Article
Engineering, Electrical & Electronic
Hao Yan, Baijie Song, Kun Zhu, Liuxue Xu, Bo Shen, Jiwei Zhai
Summary: Lead-free thin films (BNBT-xBMT) were prepared using sol-gel method and investigated for their microstructures and properties. Results showed that addition of BMT improved relaxor behavior and stability, reduced leakage current density, and achieved high energy density.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Takao Shimizu, Miyu Hasegawa, Keisuke Ishihama, Akinori Tateyama, Wakiko Yamaoka, Risako Tsurumaru, Shintaro Yoshimura, Yusuke Sato, Hiroshi Funakubo
Summary: Strong electromechanical coupling was observed in tetragonal Pb-free films prepared on a Si substrate, with higher piezoelectric coefficients compared to epitaxial films on SrTiO3 substrates. In situ X-ray diffraction analysis confirmed domain switching under an electric field, leading to significant piezoelectric response in the Pb-free materials which are far from the morphotropic phase boundary.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
L. P. Zhang, Z. L. Lv, J. P. Cao, G. L. Zhao, W. H. Tian, J. T. Liu, J. P. Liu, Y. Chen, J. Miao, Y. Jiang
Summary: This study successfully synthesized lead-free KNN-BFO thin films with significantly enhanced ferroelectric and photoelectric properties by adding BiFeO3 to KNN films. The enhancement was mainly attributed to the suppression of leakage current and the improvement of ferroelectric domains, as well as the narrowing of bandgap caused by BiFeO3 doping.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Xinkun Liu, Ying Dai, Xinmei Pei, Wen Chen
Summary: Lead-free Sr-doped BCZT thin films were successfully prepared and their structure, electric properties and ECE were investigated. The results show that the phase transition temperatures of the films change with increasing Sr content and merge at room temperature. The BCZT-0.05Sr film exhibits a giant ECE near room temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Yu Huang, Liang Shu, Fade Hu, Lisha Liu, Zhen Zhou, Yue-Yu-Shan Cheng, Suwei Zhang, Wei Li, Qian Li, Hongliang Wang, Zhinan Dong, Liyu Wei, Chuan Luo, Jing-Feng Li
Summary: Piezoelectric micromachined ultrasonic transducers (pMUTs) have attracted widespread attention due to their important applications in medical imaging, fingerprint identification, range-finding, and gesture recognition. However, the toxicity of lead limits the use of piezoelectric Pb(Zr, Ti)O-3 (PZT) in medical-related applications. This study successfully developed lead-free (K,Na)NbO3 (KNN) based pMUTs, which achieved an ultrahigh transmitting sensitivity.
Article
Chemistry, Multidisciplinary
Fan Yang, Qiang Li, Dingwei Hou, Yuxin Jia, Weijia Wang, Huiqing Fan
Summary: In this study, lead-free relaxor ferroelectric ceramics were successfully fabricated via solid-state sintering technique, and their energy storage density and efficiency were improved. The ceramics exhibited excellent temperature stability and fatigue resistance, demonstrating their potential in energy storage.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Chao Feng, Tong Liu, Xinyu Bu, Shifeng Huang
Summary: The study investigated the effects of Fe doping on the properties of PMN-PT thin films, and found that 2% Fe-doped PMN-PT thin films annealed at 650°C exhibited optimal ferroelectric properties and excellent dielectric performance.
Article
Engineering, Electrical & Electronic
Lin Li, Changrong Zhou, Yuanlei Zheng, Yusong Du, Changlai Yuan, Lei Ma, Jingtai Zhao, Guanghui Rao
Summary: The effects of LSMO thickness on the microstructure, magnetic characteristics, dielectric behavior, and energy storage performances of BNT-6BT/LSMO composite films were investigated. Compared with pure BNT-6BT film, the composite films with polycrystalline structure showed larger dielectric constant, slimmer hysteresis loop, and lower remnant polarization. The magnetization and polarization of composite films weakened with the increase of LSMO thickness due to the influence of crystalline size and strain gradient field.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Le Zhang, Ji Zhang, Kaili Li, Chao Zhou, Yin Yao, Thiam Teck Tan, Danyang Wang, Sen Yang, Sean Li, Michael A. Carpenter
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Chemistry, Multidisciplinary
Le Zhang, Haoyu Wang, Dong Wang, Mengyao Guo, Xiaojie Lou, Danyang Wang
ADVANCED FUNCTIONAL MATERIALS
(2020)
Article
Physics, Applied
Sagar E. Shirsath, R. H. Kadam, K. M. Batoo, Danyang Wang, Sean Li
Summary: In this study, the magnetic properties of Sr0.8Ca0.2AlxCoxFe12-2xO19 hexagonal ferrites were improved through Co2+-Al3+ substitution. These ferrites show great potential as rare earth-free magnets with improved saturation magnetization, coercivity, and microwave absorption characteristics. This research highlights the possibility of using hexagonal ferrites as alternatives to rare earth-based permanent magnets.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Composites
Jin Zhang, Haoyu Wang, Philippe Blanloeuil, Guang Li, Zhao Sha, Danyang Wang, Weiwei Lei, Cyrille Boyer, Yuyan Yu, Ruoming Tian, Chun H. Wang
COMPOSITES COMMUNICATIONS
(2020)
Article
Physics, Applied
Mengyao Guo, Buwei Sun, Ming Wu, Haonan Sun, Le Zhang, Qida Liu, Danyang Wang, Xiaojie Lou
APPLIED PHYSICS LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Le Zhang, Luo Zhao, Liqiang He, Dong Wang, Yunlong Sun, Danyang Wang, Xiaojie Lou, Lixue Zhang, Michael A. Carpenter
Summary: The morphotropic phase boundary (MPB) in lead-free ferroelectrics often displays large piezoelectric responses. This study found that the composition of the quadruple point (QP) with the most flattened energy profiles in Hf-doped BaTiO3 can also exhibit abnormally low piezoelectric constants. This anomaly is attributed to the progressive influence of additional strain heterogeneity induced by Hf4+ substitution in BaTiO3. The presence of an intermediate level of strain heterogeneity can result in a large elastic softening and high piezoelectricity, while a further increase in strain heterogeneity leads to weak piezoelectric outputs.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Zhengyuan Liu, Bingcheng Luo, Labao Zhang, Boyu Hou, Danyang Wang
Summary: This study investigates the effect of photons on vortex dynamics in amorphous MoSi superconducting thin films through electrical transport measurements. The results show that photon-induced reduction in the potential barrier enhances vortex depinning, mitigating the adverse effect of film inhomogeneity on superconductivity. Understanding vortex dynamics in a-MoSi thin films under external stimuli is important for further fundamental research and optimizing future superconducting devices.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Xin Liu, Peng Tan, Xue Ma, Danyang Wang, Xinyu Jin, Yao Liu, Bin Xu, Liao Qiao, Chaorui Qiu, Bo Wang, Weigang Zhao, Chaojie Wei, Kexin Song, Haisheng Guo, Xudong Li, Sean Li, Xiaoyong Wei, Long-Qing Chen, Zhuo Xu, Fei Li, Hao Tian, Shujun Zhang
Summary: By synergistically designing the ferroelectric phase, crystal orientation, and poling technique, we developed crystals with extremely high electro-optic coefficients and eliminated light-scattering domain walls, achieving high transmittance and superior electro-optic performance.
Article
Physics, Applied
Renhong Liang, Huizhong Wang, Shu Zhan, Mao Ye, Longlong Shu, Linfeng Fei, Danyang Wang, Renkui Zheng, Shanming Ke
Summary: In this study, a new high-temperature rapid heating method for thin-film preparation is developed using an ITO/mica-based flexible transparent heater. The heater demonstrates fast thermal response, high saturation temperature, and high heating-cooling rates, making it suitable for water heating and rapid thermal annealing of ferroelectric oxide thin films.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Physical
Mohammad Moein Seyfouri, Dawei Zhang, Cesar Menendez, Daniel Sando, Qi Zhang, Claudio Cazorla, Jan Seidel, Danyang Wang
Summary: This study investigates the thickness-dependent structural phase transitions in epitaxial BFCO films and reveals the influence of crystallographic distortions on their photoresponse. The results show a shift in bandgap and absorption onset due to the changes in crystal symmetry. First-principles calculations further elucidate the impact of crystallographic symmetry on the electronic structure. This work provides a practical strategy for engineering optoelectronic properties of multiferroic oxide films through thickness-induced phase transitions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Yunlong Sun, Zibin Chen, Hao Luo, Jun Liang, Shery L. Y. Chang, Danyang Wang
Summary: In this work, the dipolar entropy change of a ferroelectric thin film has been greatly improved through engineering the nanodomain structures, resulting in a significant electrocaloric effect near room temperature. The engineered thin film also exhibits decent fatigue endurance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Yunlong Sun, Jianhao Du, Chenlu Jiang, Jun Liang, Xun Geng, Yu Wang, Danyang Wang
Summary: The electrocaloric effect (ECE) provides a promising method for solid-state cooling that is efficient and environmentally friendly. However, the investigation of the negative ECE has been lagging behind due to its elusive origin. In this study, the negative ECE behavior of conventional ferroelectric thin films, specifically 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO(3) (BNBT), was examined. It was found that the BNBT thin film exhibited a remarkable adiabatic temperature change (delta T) of -26.1 K near 160 degrees C, which was attributed to the ferroelectric phase transition from rhombohedral (R3c) to tetragonal (P4bm) in the polar nanoregions.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Yunlong Sun, Zibin Chen, Hao Luo, Jun Liang, Shery L. Y. Chang, Danyang Wang
Summary: This study successfully improved the electrocaloric performance of ferroelectric thin films through modulating the growth conditions, achieving a significant electrocaloric effect near room temperature with good fatigue endurance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Ji Zhang, Jack Yang, Grace L. Causer, Junjie Shi, Frank Klose, Jing-Kai Huang, Allen Tseng, Danyang Wang, Xiaotao Zu, Liang Qiao, Anh Pham, Sean Li
Summary: This study systematically investigates the dependency of exchange bias (EB) on interfacial spin frustration in magnetic complex oxide heterostructures and reveals a highly tunable EB field achieved by manipulating spin frustration through changes in stacking sequence.
Article
Engineering, Electrical & Electronic
Sagar E. Shirsath, Danyang Wang, Ji Zhang, Akimitsu Morisako, Sean Li, Xiaoxi Liu
ACS APPLIED ELECTRONIC MATERIALS
(2020)
