Article
Chemistry, Multidisciplinary
Yumin Zhang, Xinya Feng, Fei Li, Dechao Meng, Ting Zheng, Jiagang Wu
Summary: Reducing mechanical losses and suppressing self-heating are critical characteristics for high-power piezoelectric applications. A novel hardening method called grain boundary diffusion was used to develop Pb-free potassium sodium niobate ceramics, leading to a significant increase in the mechanical quality factor (Q(m)) and a high piezoelectric coefficient (d(33)). The established properties are associated with the formation of the core-shell microstructure and the full gradient composition distribution, providing a new paradigm for the design of functional materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Changhao Zhao, Shuang Gao, Tiannan Yang, Michael Scherer, Jan Schultheiss, Dennis Meier, Xiaoli Tan, Hans-Joachim Kleebe, Long-Qing Chen, Jurij Koruza, Juergen Roedel
Summary: The study presents a novel approach for electroceramics by utilizing precipitates to pin domain walls, improving piezoelectric properties and enhancing mechanical quality factor. This new method reduces hysteresis in electrostrain while slightly increasing the piezoelectric coefficient and electromechanical coupling factor. The process can be smoothly implemented in industrial production and easily optimized in laboratory settings for various ferroelectric systems.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Yihan Ma, Mo Zhao, Dongyan Zhang, Zhimin Li, Maolin Zhang, Li Jin, Yangxi Yan
Summary: In this study, quaternary piezoelectric ceramics were prepared using a traditional solid-state route and showed improved mechanical quality factor and reduced loss. The addition of an appropriate amount of PMT allowed for the homogeneous incorporation of Mg2+ ions into the crystal lattice and the formation of defect dipoles, leading to enhanced performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Yang Li, Marcell Borbely, Andrew Bell
Summary: The study on 0.71Pb(Mg1/3Nb2/3)O-3-0.29PbTiO(3) doped with 2.5% Sm on the A-site shows a significant increase in piezoelectric performance, a reduction in conductivity, and a decrease in oxygen vacancy concentration. The nonlinearity of permittivity with respect to field amplitude increases significantly with Sm doping, with both reversible and irreversible contributions also increasing significantly.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Inorganic & Nuclear
Yutong Wu, Yuan Cheng, Shangyi Guan, Xiang Wang, Wei Shi, Hongfei Xu, Rong Lang, Jie Xing, Jianguo Zhu, Qiang Chen
Summary: This study presents a new approach to enhance the piezoelectric constant and mechanical quality factor of KNN-based ceramics through a donor-acceptor codoping strategy. The donor dopant Ho3+ improves the piezoelectric constant by refining the domain size, while the acceptor dopant (Cu1/3Nb2/3)(4+) enhances the mechanical quality factor by forming defect dipoles.
INORGANIC CHEMISTRY
(2023)
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
Materials Science, Ceramics
Myang Hwan Lee, Hae In Choi, Da Jeong Kim, Ji Su Kim, Tae Kwon Song
Summary: Hard piezoelectric properties were investigated in lead-free BiFeO3-BaTiO3 (BF- BT) ceramics. Rhombohedral (R) phase ceramics of (1 - x)BF-xBT (x = 0.20-0.30) were prepared. The x = 0.20 ceramic showed the best hard piezoelectric properties, with the highest Q(m) = 403 and the highest T-C = 607°C. In contrast, the x = 0.30 ceramic showed soft piezoelectric properties, with d(3)(3) = 301 pC/N and k(p) = 0.33, and T-C = 510°C. The BF-BT system in the R-phase-rich region has good hard piezoelectric properties for transducer applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Qijun Wang, Xuefan Zhou, Lin Tang, Muhammad Habib, Yan Zhang, Dou Zhang
Summary: BiScO3-PbTiO3-based ceramics have great potential for high-temperature piezoelectric applications, but their high dielectric loss and low mechanical quality factor must be optimized. By systematically investigating a ceramic system with varying Ni and Nb doping levels, improvements in phase structure and lattice distortion were achieved, leading to enhanced piezoelectric properties and temperature stability.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Analytical
So-Won Kim, Hee-Chul Lee
Summary: In this study, novel materials for an ultrasonic vibrator were developed by optimizing the properties of piezoelectric materials. The ceramic shape was optimized using finite element analysis software, resulting in high coupling factors and mechanical quality factors. The fabricated ultrasonic vibrator achieved maximum amplitude at a frequency of 1.06 MHz.
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
Wenbin Tang, Yuequn Wang, Guanglei Xiang, Xuefeng Zhao, Zhiyong Pan, Yiping Wang, Ying Yang, Yaojin Wang, Guoliang Yuan
Summary: In this study, Fe2O3-doped high-power piezoelectric ceramics PZMNZT-0.15Fe were prepared, which showed excellent electrical properties with a piezoelectric coefficient of 315 pC/N, mechanical quality factor of 1738, and an output vibration velocity of 0.90 m/s, 2.25 times higher than commercial PZT4 ceramic. This work reveals the competitiveness of PZMNZT-0.15Fe ceramic for high-power applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Mengmeng Hao, Guifen Fan, Wei Cai, Chuang Zhou, Fangfang Zeng, Jianjia Zhang, Yanjiong Wang, Xin Chen, Xiaohong Wang, Wenzhong Lv
Summary: Textured Pb97.5%Ba2.5% [(Zn1/3Nb2/3) ((1-x))-Ti-x]O-3 ceramics were successfully achieved using BaTiO3 template, with Ti4+ content influencing the texture degree significantly. A minimum of 9% Ti4+ content is required for texture growth, with optimized properties reached at around 9%. The research provides insights into texture growth and aids in the design of multi-functional devices.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Ziling Wang, Huangfu Geng, Hongyuan Xiao, Yiping Guo
Summary: This study demonstrates that Bi(Ni2/3Nb1/3)O-3 (BNN) effectively suppresses the valence fluctuation of Fe ions in 0.69BF-0.31BT ceramics, resulting in high Curie temperatures and excellent piezoelectric performance. These ceramics have potential as candidates for sensor and actuator applications over a broad temperature range.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Yangxi Yan, Yan Chen, Zhimin Li, Dongyan Zhang, Maolin Zhang, Li Jin, Mo Zhao
Summary: CuF2-doped PIN-PHT ceramics were prepared at lower temperatures, resulting in materials with improved piezoelectric properties and mechanical quality factors. The addition of CuF2 reduced the lattice size and enhanced the piezoelectric response. Samples with an appropriate doping content exhibited excellent performance at room temperature and Curie temperature.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Pengbin Wang, Qinghu Guo, Fei Li, Fangquan Xia, Hua Hao, Huajun Sun, Hanxing Liu, Shujun Zhang
Summary: This study presents a strategy to address the trade-off between large piezoelectric responses and broad service temperature range in ferroelectric ceramics. By utilizing the synergistic contribution of morphotropic phase boundary and enhanced local structural heterogeneity, the researchers achieved excellent piezoelectric coefficient and high Curie temperature in the Sm modified 0.25PIN-0.325PZ-0.425PT ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)