JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Feng Mao,Xiaoxin Zhang,Qingzhi Yan
The application scope of advanced ceramics is significantly limited due to their inherent brittleness, making the enhancement of fracture toughness a critical area of research. Although the incorporation of SiC whiskers (SiCw) has been shown to effectively improve fracture toughness, a high content of whiskers complicates the densification process. Herein, we discovered that the addition of SiCw can react in-situ with sintering additives, enabling SiC ceramics to achieve densification while incorporating a substantial quantity of whiskers. We systematically investigated the effects of stacking faults in SiC whiskers on the densification and microstructure of ceramics. SiCw with stacking faults reacted with sintering additives, leading to improved densification and refined grains. In contrast, whiskers without stacking faults maintained a rod-like structure within the ceramic matrix, resulting in whisker debonding and pull-out. When 40 vol.% SiCw was added, the optimized flexural strength and fracture toughness can reach 885 MPa and 8.94 MPa·m 0.5 , respectively.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Hao Liang,Weitong Lin,Qiming Wang,Wei Zhang,Shixue Guan,Jiawei Zhang,Ji-Jung Kai,Duanwei He,Fang Peng
Cubic boron nitride (cBN), a typical superhard material, has garnered significant interest for both fundamental scientific research and technical applications. Here, nanostructured cBN with high-density nanotwins and stacking faults was synthesized by rapid quenching using hexagonal boron nitride (hBN) as the starting material at a moderate temperature (2200 K) and low pressure (13 GPa). This synthetic nanostructured cBN exhibits high Vickers hardness (78 GPa), high fracture toughness (11.8 MPa·m 1/2 ), and extremely high oxidization temperature (1565 K). We propose that the refined grain structure and excellent mechanical properties of the cBN synthesized in this study is attributed mainly to dislocation slips and (111) mechanical nanotwins that dominate this phase transformation.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Beini Gong,Yonghong Lu,Pingxiao Wu,Zhujian Huang,Yajie Zhu,Zhi Dang,Nengwu Zhu,Guining Lu,Junyi Huang
For enhanced photocatalytic performance of visible light responsive CdZnS, a series of Cd 0.5 Zn 0.5 S solid solutions were fabricated by different methods. It was found that the semiconductor obtained through the precipitation-hydrothermal method (CZS-PH) exhibited the highest photocatalytic hydrogen production rate of 2154 μmol h −1 g −1 . The enhanced photocatalytic hydrogen production of CZS-PH was probably due to stacking fault formation as well as narrow bandgap, a large surface area and a small crystallite size . Based on this, carbon nanotubes modified with Cu 2+ (CNTs (Cu)) were used as a cocatalyst for CZS-PH. The addition of CNTs (Cu) enhanced notably the absorption of the composites for visible light. The highest photocatalytic hydrogen production rate of the Cd 0.5 Zn 0.5 S-CNTs (Cu) composite was 2995 μmol h −1 g −1 with 1.0 wt.% of CNTs (Cu). The improvement of the photocatalytic activity by loading of CNTs (Cu) was not due to alteration of bandgap energy or surface area, and was probably attributed to suppression of the electron-hole recombination by the CNTs, with Cu 2+ anchored in the interface optimizing the photogenerated electron transfer pathway between the semiconductor and CNTs. We report here the successful combination of homojunction and heterojunction in CdZnS semiconductor, which resulted in promotion of charge separation and enhanced photocatalytic activity.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Zhidong Wei,Jiawei Yan,Yuchen Zhang,Jiasheng Chi,Huoshuai Huang,Junying Liu,Jianli Mi,Linlin Ma,Wenjian Fang,Wenfeng Shangguan,Zhen Huang
Modulation of the built-in electric field was one of the effective strategies to enhance the separation of photogenerated carriers. Herein, corner-cut nano-cubic Al: SrTiO 3 was synthesized via the stoichiometric SrCl 2 molten salt regulation strategy. Notably, a rare phenomenon of stacking fault effect in SrTiO 3 , induced by Al 2 O 3 phase transition doping, was discovered. This phenomenon could serve as an effective approach for modulating the built-in electric field within Al:SrTiO 3 , and the photocarrier lifetime could be prolonged to exceed 2500 ps after investigated by the femtosecond ultrafast spectroscopy, which could be ascribed to the hole capture by Al 3+ through TiO 6 polarizability regulation. Consequently, compared to samples without stacking fault effect, the optimized Al: SrTiO 3 photocatalysts demonstrated an enhanced STH efficiency increasing from 0.15 % to 0.5 %. This work revealed the phenomenon of stacking fault effect in nano-photocatalysts and proposed insights into the mechanisms of the built-in electric field regulation through microstructure polarization.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Yuang Li,Yingli Zhu,Gangtao Luo,Pingan Chen,Mengke Qiao,Fu Chen,Xiangcheng Li
Polymer-derived SiBCN ceramics (PDCs-SiBCN) have emerged as promising candidates for high-performance electromagnetic wave absorption applications. However, their strong electromagnetic loss, attributed to high crystalline phase content, simultaneously causes impedance mismatch and a narrow absorption bandwidth. To address this challenge, this study proposes an innovative stacking faults (SFs) defect engineering strategy, which can achieve high dielectric loss at low crystallinity. Specifically, SiC whiskers with high-density SFs were catalytically grown using an Fe-mediated liquid-solid interface during polyborosilazane pyrolysis. These SFs serve as effective polarization centers, significantly enhancing dielectric loss capability. By optimizing Fe content, fewer crystalline phases and high SFs density were achieved in SiBCN, thereby realizing impedance matching and strong dielectric loss. Consequently, the unique microstructure expanded the effective absorption bandwidth of SiBCN from 4.82 to 6.36 GHz at 2.1 mm thickness, demonstrating record-breaking broadband absorption performance among PDCs. This Fe-mediated SFs defect engineering provides a strategic pathway to resolve the long-standing conflict between “impedance matching and strong dielectric loss” in PDCs.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
电磁波吸收
·
缺陷工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·Vol. 21
·期 43
·e03591
·
IF 12.1
Jinyang Li,Wenye Deng,Yan Xue,Ni Ai,Kai Ding,Pengjun Zhao,Yongmei Gao,Aimin Chang,Yongxin Xie
Owing to its wide bandgap, LaAlO 3 has garnered extensive attention in the field of high-temperature negative temperature coefficient (NTC) thermistors. However, its poor thermal stability and excessively high B value limit the working temperature range. In this work, introducing O 2p and Ni 3d hybrid energy levels into the bandgap is proposed via Ni doping and inducing stacking faults in the crystal structure to narrow the bandgap and enhance aging performance. Density functional theory (DFT) calculations indicate that the hybrid energy levels within the bandgap reduce the energy required for electron transitions. As a result, LaAlO 3 exhibits a lower B value of 1565 K, with the lower limit of the temperature range extending to −100 °C. Structural analysis reveals that as the Ni content increases, the crystal structure transitions from the R-3c phase to the Pm-3m phase at room temperature, with stacking faults predominantly observed in Ni-enriched regions. The introduction of these stacking faults causes oxygen vacancies to shift from a disordered to an ordered arrangement, forming a stable percolation network. This network inhibits the random diffusion of oxygen vacancies, thereby reducing aging instability from 33% to 4%. This work demonstrates the feasibility of improving NTC performance through stacking fault engineering.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Xiao Wang,Zhihao Wu,Yi Sun,Qiang Shen
As one of the most commonly used binary alloys , the effect of intermetallic compounds (IMCs) of Al-Cu alloys in powder metallurgy on their structure and properties is instructive for tailoring Al-Cu alloys for different applications. In this investigation, a series of Al-Cu-Ag alloys with varying Cu compositions were fabricated via hot pressing. TEM analysis identified CuAl 2 as the primary intermetallic compounds , with Ag existing in forms including Ag 2 Al, elemental Ag, and an Ag-(Cu) solid solution . The modulation of Cu content influenced the state of Ag and the mechanical behaviors of the Al-Cu-Ag alloy. Particularly, the high Al/Cu alloy, benefiting from a synergistic effect comprising stacking faults, nanoscale precipitates, and solid solutions, exhibited outstanding mechanical properties. Conversely, the Al-50Cu-3Ag alloys displayed significant brittleness , attributed to the adverse impact of large-scale intermetallic compounds and increased grain size due to the formation of CuAl 2 . The incorporation of nanoparticles effectively mitigated the grain size in high Al/Cu alloys. This study elucidates the correlation between the evolution of intermetallic compounds and composition in Al-Cu alloys, offering novel insights into the reinforcement of both Al-based and Cu-based alloys.
研究领域:
材料科学
·
金属学与热处理
·
粉末冶金
·
结构材料
·
合金设计
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Haimin Liu,Mengmeng Jin,Da Zhan,Jinming Wang,Xiaoyi Cai,Yongting Qiu,Linfei Lai
Structure modulation of transition metal phosphides at the atomic scale can significantly modify their catalytic properties. Herein, stacking faults abundant Ni 2 P/Co 2 P electrocatalysts with outstanding bifunctional oxygen evolution and hydrogen evolution property have been prepared. The stacking faults are formed by slow dissolution of Ni substrate by Mo 6+ and further redeposition of Ni 2+ during the growth of Co(OH)F crystals. Unprecedentedly, the distinct mechanistic etching-redeposition pathway dictated by the stacking faults, heterostructures and crystal lattice deformation leads to lattice expansion of Co 2 P and enables preferred reactants adsorption. Electrolysis cell employing Ni 2 P/Co 2 P electrocatalysts as a bifunctional catalyst for both the cathode and the anode delivers a current density of 10 mA cm −2 at a cell voltage of 1.57 V, which is comparable to the integrated Pt/C and IrO 2 counterparts. The exceptional electrocatalytic performance of Co 2 P/Ni 2 P-x%Mo indicates the redeposition mechanism a new methodology to modulate the structure and surface reactivity of electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Han Pang,Zebin Yu,Xuanning Qin,Ben Fan,Ronghua Jiang,Shuang Li,Yanping Hou,Wenjun Tang,Mi Wang,Zhikai Shi
Stress engineering can improve catalytic performance by straining the catalyst lattice. An electrocatalyst , Co 3 S 4 /Ni 3 S 2 -10%Mo@NC, was prepared with abundant lattice distortion to boost oxygen evolution reaction (OER). With the assistance of the intramolecular steric hindrance effect of metal–organic frameworks, slow dissolution by MoO 4 2- of the Ni substrate and recrystallization of Ni 2+ was observed in the process of Co(OH)F crystal growth with mild temperature and short time reaction. The lattice expansion and stacking faults created defects inside the Co 3 S 4 crystal, improved the material conductivity, optimized the valence band electron distribution of the material, and promoted the rapid conversion of the reaction intermediates. The presence of reactive intermediates of the OER under catalytic conditions was investigated using operando Raman spectroscopy . The electrocatalysts exhibited super high performance, a current density of 10 mA cm −2 at an overpotential of 164 mV and 100 mA cm −2 at 223 mV, which were comparable to those of integrated RuO 2 . Our work for the first time demonstrates that the dissolution–recrystallization triggered by strain engineering is a good modulation approach to adjust the structure and surface activity of catalyst, suggesting promising industrial application.
研究领域:
材料科学
·
电化学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Catalysis
·
2019
·Vol. 2
·期 12
·1107-1114
·
IF 0
Li Zhe,Fu Jian-Yu,Feng Yi,Dong Cun-Ku,Liu Hui,Du Xi-Wen
Finding highly active and low-cost catalysts is a crucial endeavour to harvest clean hydrogen via electrochemical water splitting. Currently, the best catalyst for the hydrogen evolution reaction is based on metallic platinum whose high price severely restricts large-scale application. Here we report a silver catalyst with superior activity and durability in an acid medium that outperforms commercial platinum on carbon, especially under high applied voltages. We adopt a physical technique—laser ablation in liquid—to generate a high density of stacking faults in silver nanoparticles. We find that the stacking faults can cause a low coordination number and high tensile strain, which jointly improve the adsorption energy and transform the non-active silver into a highly active catalyst. In light of the high activity, conductivity, durability and low price, the silver catalyst can serve as a promising alternative to commercial platinum on carbon for industrial application.
研究领域:
催化
·
电化学
·
材料科学
·
能源材料
✓ 已验证
DOI
Nanomaterials
·
2024
·Vol. 14
·期 20
·1629
·
IF 4.4
Penghui Lei,Qing Chang,Mingkun Xiao,Chao Ye,Pan Qi,Fangjie Shi,Yuhua Hang,Qianwu Li,Qing Peng
A new type of SiCf/TiC-Ti3SiC2composite was prepared by the Spark Plasma Sintering (SPS) method in this work. The phase transformation and interface cracking of this composite under ion irradiation (single Xe, Xe + He, and Xe + He + H ions) and subsequent annealing were analyzed using transmission electron microscopy (TEM), mainly focusing on the interface regions. Xe ion irradiation resulted in the formation of high-density stacking faults in the TiC coatings and the complete amorphization of SiC fibers. The implanted H ions exacerbated interface coarsening. After annealing at 900 °C for 2 h, the interface in the Xe + He + H ion-irradiated samples was seriously damaged, resulting in the formation of large bubbles and cracks. This damage occurred because the H atoms reduced the surface free energy, thereby promoting the nucleation and growth of bubbles. Due to the absorption effect of the SiCf/TiC interface on defects, the SiC fiber areas near the interface recovered back to the initial nano-polycrystalline structure after annealing.
研究领域:
材料科学
·
核材料
·
复合材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Boren Ke,Ji Zou,Weimin Wang,Wei Ji,Zhengyi Fu
ZrC-SiC-ZrB 2 ceramics were prepared via ultra-high pressure sintering under 15 GPa at 1200 °C. The densification mechanism, microstructures, and properties of the prepared ceramics were investigated. The sintered ceramics with ZrB 2 content of 15 vol % showed the improved comprehensive mechanical properties, including Vickers hardness of 26.6 GPa, Young's modulus of 469.1 GPa, and fracture toughness of 5.0 MPa·m 1/2 , which was 86.7 % higher than that of pure ZrC ceramics. In the sintered sample, the ultra-high pressure induced new microstructure, such as L-C lock in ZrC phase, stacking faults and nanotwins in SiC phase, and severe lattice distortion in ZrB 2 phase, jointly contributed to the improvement in Vickers hardness. Deflection and bridging during crack propagation were ascribed to the uniform combination of various phases.
研究领域:
材料科学
·
陶瓷工程
·
力学性能
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）