JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Lili Liu,Haijie Guo,Lei Wang,Qiufeng Shi,Jianwei Qiao,Cai’e Cui,Ping Huang
Ultraviolet-A persistent luminescence (UVA PersL) materials have attracted considerable attention due to their extensive potential in applications such as photodynamic therapy, photocatalysis, and sterilization. Herein, we report a novel UVA PersL phosphor Y 3 Ga 3 MgSiO 12 :Bi 3+ (YGMSO:Bi 3+ ) with continuous photocatalytic capabilities. The PersL duration of the YGMSO:0.005Bi 3+ sample can exceed 8 h after excitation with 254 nm UV light, and the UVA PersL emission peak is located at 324 nm. Specifically, we investigated the distribution and depth of traps using thermoluminescence curves and further demonstrated that oxygen vacancy is the main defect type responsible for producing PersL by X-ray photoelectron spectroscopy. On this basis, the PersL mechanism of YGMSO:Bi 3+ is established. Furthermore, considering that the UVA PersL spectrum of YGMSO:Bi 3+ aligns with the absorption band of TiO 2 , we synthesized YGMSO:Bi 3+ /TiO 2 composite for methylene blue degradation experiments. The experimental results indicate that the material can serve as a continuous excitation source for TiO 2 , facilitating its application in continuous photocatalysis. Overall, the developed UVA PersL material YGMSO:Bi 3+ offers valuable insights for the design of UVA light sources for photocatalytic applications.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wei Zhao,Shao-Hua Luo,Yicheng Lin,Guodong Hao,Rui Huang,Pengyu Li,Ge Wang,Jun Cong,Shengxun Yan,Lixiong Qian
P2-type Fe/Mn base oxide cathodes arouse much attention in sodium-ion batteries due to their high theoretical specific capacity, economic feasibility , and environmental friendliness . However, detrimental phase transitions and irreversible oxygen release result in continuous capacity decay, thereby posing a significant challenge to the simultaneous achievement of high capacity and high stability. To address this challenge, the optimal Na 0.67 Mg 0.06 Li 0.06 Fe 0.28 Mn 0.6 O 2 (NMLFM-2) cathode material , was developed in this study, which realizes a complete solid solution process and a stable oxygen redox reaction within the voltage window of 2–4.2 V. The introduction of Mg and Li realizes the “rich-Na e ” effect, which raises the valence state of Mn, thereby stabilizing the oxygen redox reaction and reducing the Jahn-Teller effect of Mn 3+ . The elimination of the unfavorable P2 to OP4 phase transition achieves a complete solid solution reaction, enhancing the structural stability and Na + fast reaction kinetics of the material. Thus, the NMLFM-2 cathode delivered a high initial specific capacity of 160.3 mAh g −1 at 0.1C within the voltage range of 2–4.2 V, realizing an impressive cycling performance with 89.3% capacity retention after 200 cycles at 1C. This study presents a novel pathway for simultaneously achieving structural stability and reversible oxygen redox, thereby enabling the trade-off between cathode capacity and stability in Fe/Mn-based layered oxides.
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Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Xuefei Li,Zhiwei Guo,Zumin Wu,Wei Yu,Chengqing Yuan
Under boundary lubrication conditions, the instability of the water film causes severe wear in water-lubricated bearing friction pairs. To address the poor wear resistance of polymer materials for water-lubricated bearings, this study utilized freeze-casting technology to fabricate a porous silicon nitride skeleton and introduced polyurethane via vacuum impregnation, successfully preparing a silicon nitride/polyurethane water-lubricated ceramic composite. The effects of slurry solid content on the porous structure of silicon nitride and the composite's properties were investigated. The results demonstrate that solid content influences the number of ice crystal layers, thereby affecting pore spacing and wall thickness. The introduced polyurethane forms a soft-hard structure with the porous silicon nitride skeleton, providing storage capacity and wear resistance. Additionally, due to its damping and lubricating effects, polyurethane significantly reduces friction-induced vibration and the friction coefficient of the composite. The synergistic effects of these factors markedly improve the tribological performance of the composite. Under a 10 N load, the composite exhibits a 68.7 % and 76 % reduction in friction coefficient compared to pure polyurethane and industrial silicon nitride, respectively, with wear amounts decreased by 96 % and 63.3 %.
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Journal of Materials Research and Technology-JMR&T
·
2026
·
IF 7.3
Xuefei Li,Lingyun Qin,Zumin Wu,Qiren Huang,Zhiwei Guo,Xiuqin Bai,Chengqing Yuan
To address severe friction and wear of water lubricated bearings under boundary lubrication caused by the low viscosity of water, a functional composite was developed by grafting a hydrophilic layer onto Si 3 N 4 /PU and incorporating load bearing hydrogel particles. The design utilizes the hydration lubrication of the surface hydrophilic layer in the initial friction stage and the sustained hydration lubrication of exposed hydrogel particles after wear, thereby maintaining an improved hydration lubrication state throughout the entire friction process. Systematic materials tests (contact angle, compression, and reciprocating friction) were conducted to investigate the effects of hydrogel content, while bearing-level bench tests under various specific pressures were carried out with pure PU bearings as a reference to verify the practical tribological performance. The composite with 0.5 wt% hydrogel showed optimal performance. Under 40 N, its friction coefficient (0.23) and wear rate (8.5 × 10 −6 mm 3 /(N·m)) were reduced by 19% and 53.1% compared with the hydrogel-free composite. Under 0.3 MPa, the composite bearing reduced friction coefficient and wear volume by 12.1% and 65% relative to pure PU (0.19 and 0.8 mm 3 ). Notably, when specific pressure increased from 0.3 to 0.7 MPa, the composite's average friction coefficient further decreased by 59.9%, showing a continuous declining trend with increasing load, indicating excellent load-adaptive capacity. This study provides an effective approach for improving the tribological performance of water-lubricated bearing materials under boundary lubrication.
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Additive Manufacturing
·
2026
·
IF 11.3
Xinkun Liu,Xiong Gao,Jingyi Chen,Xiaotong Chen,Wenqing Wang,Zhaoliang Qu,Rujie He
PEG400 broadens the debinding temperature window by ∼100 °C, enabling stepwise resin decomposition in VPP alumina. • Early PEG decomposition constructs 3D pores for efficient gas escape, suppressing delamination and cracks. • 10 vol% PEG optimizes defect control, achieving 234 MPa flexural strength (30% improvement) and 97.1% relative density. • Debinding window engineering is a generalizable strategy for defect regulation in light-cured 3D-printed ceramics. To address the critical challenges of narrow debinding window and defect formation in vat photopolymerization (VPP) 3D-printed alumina ceramics with high resin content (as high as 50 vol%), this study introduces polyethylene glycol (PEG400) as an auxiliary organic phase. The concentrated thermal decomposition of the single-resin system, typically occurring within a sharp temperature range of 300–500 °C, was transformed into a stepwise process spanning 200–500 °C by PEG pre-decomposition. This window broadening of ∼100 °C facilitated early gas release through interconnected pore channels formed at low temperatures, thereby alleviating internal pressure and stress accumulation during main resin decomposition. Quantitative X-ray computed tomography analysis confirmed significant defect suppression, with the 10 vol% PEG group (P1) achieving the lowest average defect volume and delamination fraction. Consequently, sintered samples exhibited 30% improvement in flexural strength (234 MPa) and 97.1% relative density. These results demonstrate that broadening the debinding temperature window is an effective strategy for defect control and mechanical property enhancement in VPP ceramics. Download: Download high-res image (227KB) Download: Download full-size image In this study, a PEG-mediated debinding strategy is proposed to address the critical challenges of narrow debinding window and crack formation in conventional single-resin systems. In the traditional system, rapid gas release leads to internal pressure accumulation and defect generation, resulting in a mechanical strength of only 185 MPa. In contrast, PEG decomposition constructs a connected pore network, achieving efficient debinding in a broadened temperature window of 200–500 °C, significantly reducing defects, and ultimately increasing the mechanical strength to 234 MPa, providing a new efficient debinding pathway for high-performance ceramic 3D printing.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Jiaxuan Cui,Xi Feng,Peng Peng,Tao Chen,Taiyu Zhou,Tianming Li,Li Zhang,An Xue,Zhanming Dou,Fangping Wang,Guifen Fan,Fangfang Zeng
To address the demand for high-precision piezoelectric devices featuring high piezoelectric performance and excellent temperature stability, x Ce-PMN-35PT piezoelectric ceramics were synthesized via cerium doping. Ce ions preferentially occupy the A-site substituting for Pb 2 + , as evidenced by XRD peak shifts and Raman spectral evolution. Combined lattice variation and ionic radius data suggest a valence evolution from Ce 4+ towards Ce 3+ with increasing doping content. The results show that the ceramic with 2 mol% Ce doping exhibits superior comprehensive performance: the piezoelectric coefficient d 33 reaches 780 pC/N, the large-signal piezoelectric coefficient d 33 * is 1101 pm/V, and the unipolar electrostrain only degrades by 6.4% across the broad temperature range from 25 to 125 ℃. Through in situ XRD and Rietveld refinement, this study further elucidated the intrinsic correlation among phase structure, domain switching dynamics, and piezoelectric properties, thereby revealing the underlying mechanism by which cerium doping optimizes material performance. This work not only offers a promising material system for medium-temperature high-precision piezoelectric actuators but also presents an effective strategy for tailoring the properties of PMN-PT-based ceramics.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Zhuoqing An,Xiaolong Ni,Zhuang Ma,Yuan Gao,Jiajing Chen
To investigate the effects of La 2 O 3 and Fe 2 O 3 on the structure and high viscosity of the CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) glass system, the microstructure was analyzed using in-situ high-temperature Raman spectroscopy, and the viscosity was measured by high temperature hot-stage. A series of cluster models representing aluminosilicate systems modified by La and Fe ions were constructed, followed by geometric optimization and Raman spectral simulation via quantum chemistry ab initio calculations. The results indicates that the effects of La 2 O 3 and Fe 2 O 3 on both vibrational wavenumber and Raman scattering cross-section (RSCS) followed the order: La < (La + Fe) < Fe. The addition of La 2 O 3 and Fe 2 O 3 loose the glass network structure, and led to a progressive rise in the relative content of Q 0 , Q 1 , and Q 2 units, accompanied by a notable decrease in Q 3 and Q 4 units. Consequently, the high viscosity and viscous flow activation energy decrease with the addition of La 2 O 3 and Fe 2 O 3 , but Fe 2 O 3 has a more pronounced effect. Furthermore, based on the NBO/T for characterizing the microstructure, the relationship between viscosity and microstructure is quantitatively analyzed.
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ACTA MATERIALIA
·
2026
·
IF 10.7
Qi-Lin Zheng,Wei-Wei Yuan,Min Wen,Shengqi Chu,Min Lin,Zhensheng Hong,Jiaxin Li,Lituo Zheng,Zhigao Huang,Hu-Rong Yao
P'2-type manganese-rich layered oxides are promising cathodes for sodium-ion batteries. However, their synthesis requires unconventional rapid quenching to prevent O₂ absorption and P'2-P2 phase transformation during cooling, which compromises scalability and safety. Moreover, Jahn-Teller active ion enrichment and irreversible phase transitions during cycling impair structural stability. These synthesis challenges and inadequate electrochemical performance hinder practical applications. Herein, we report for the first time a simple solid-state synthesis of P'2-Na 0.55 Mg 0.05 Mn 0.90 O 2 (Na□MM□) cathode with a 3.78% lattice distortion through a dual-vacancy strategy. The Na□MM□ cathode delivers an ultrahigh energy density of 786 Wh·kg −1 . Na vacancies stabilize P'2 structure and enable a reversible P'2-OP4 transition, delivering 35 mA·h·g⁻¹ extra capacity. TM vacancies further synergize with Na vacancies to stabilize the TM-O framework, suppressing lattice oxygen loss and Mn³⁺ enrichment, which improves 100 cycles capacity retention by 28.7%. This work advances the synthesis and electrochemistry of P'2-type materials, offering a practical path toward application. Download: Download high-res image (286KB) Download: Download full-size image
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Reihaneh Jalali Shahrbabaki,Mahdi Feizpour,Hadi Barzegar-Bafrooei,Kaixin Song
Silicate-based microwave dielectric ceramics are increasingly important for next-generation communication systems owing to their low permittivity, high quality factor, and thermal stability. In this study, the influence of mechanical activation on the sintering behavior, structural evolution, and microwave dielectric performance of cordierite ceramics was systematically investigated, with particular emphasis on the minor and major activation conditions represented by 2 h and 32 h milling durations. The powders were subsequently sintered at 1400–1430 °C. Prolonged mechanical activation significantly accelerated densification, enabling near-full density (≥99% TD) to be achieved at 1410–1420 °C, whereas the 2 h milled powders required higher sintering temperatures (1420–1430 °C). Raman spectroscopy revealed subtle local structural variations after sintering, whereas X-ray diffraction and Williamson–Hall analyses confirmed largely comparable long-range crystallographic characteristics. Quantitative SEM-based grain-size analysis involving a statistically significant population of grains demonstrated that prolonged milling primarily reduced grain-size variability and improved microstructural uniformity, while producing only minor changes in the final average grain size. Microwave dielectric measurements showed that the dielectric response evolved from a porosity-controlled regime at lower temperatures toward a microstructure-sensitive regime near full densification. While ε r steadily increased with increasing density for all milling conditions, Q×f exhibited non-monotonic behavior. The highest Q×f value of 50,582 GHz was obtained at 1420 °C for the specimen prepared from the 2 h milled powder, despite its slightly lower density compared with the 32 h counterpart. This finding demonstrates that maximum densification and improved structural homogeneity alone are insufficient to optimize microwave dielectric performance. The optimum dielectric properties corresponded to ε r ≈ 5.35–5.57 and τ f values near −23 ppm/°C. The stability of τ f together with the preserved structural characteristics indicates that intrinsic lattice contributions remained largely unchanged, whereas the variations in Q×f were governed predominantly by processing-induced microstructural evolution, particularly the grain-boundary-related effects associated with the finer grain structure.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Zhenyu Li,Jian Li,Tengfei Kan,Shiyu Huang,Junbai Liu,Honghai Zhong,Junwu Liu,Yang Jiang
Lithium aluminosilicate (LAS) glass-ceramics with high mechanical performance were synthesized via a streamlined one-step crystallization process doping with yttrium oxide (Y 2 O 3 ). This study systematically investigated the multi-scale synergistic effects of doping (0 - 4 wt%) Y 2 O 3 on the network topology, crystallization kinetics, and macroscopic properties of the LAS system. Spectroscopic and microstructural analyses revealed that at an optimal doping level of 2 wt%, Y 3+ cations act as effective network modifiers. They coordinated with non-bridging oxygens to maximize the proportion of highly interlocking acicular β-spodumene microstructure. Consequently, the glass-ceramics crystallized at 1000 °C for 90 min exhibited superior mechanical properties, achieving a peak flexural strength of 137.5 MPa and a Vickers hardness of 848.6 HV. In addition, excessive Y 2 O 3 additions (>2 wt%) triggered a competitive reaction with the TiO 2 nucleating agents, precipitating a secondary Y 2 Ti 2 O 7 phase. This critical depletion of nucleation sites inevitably led to network depolymerization and abnormal grain coarsening, severely deteriorating the mechanical integrity. Ultimately, this work elucidates the critical compositional window for Y 2 O 3 in LAS glass-ceramics, providing a referenceable empirical foundation for designing high-strength, rigid structural materials.
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ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Fan Fan,Haodan Pan,Huajie Tang,Xinyu Zhao,Chenyue Guo,Qihao Xu,Qixiang Chen,Zhaofeng Dai,Dongliang Zhao
Sub-ambient daytime radiative cooling is a promising approach to energy challenges, but its long-term application is limited by performance losses from dust accumulation. Hydrophobic modification is ineffective at preventing dust embedding into the pores of radiative cooling materials, while traditional protective layers typically either compromise performance or are inconvenient for scalable deployment. Herein, a straightforward strategy integrating a MgO–Y 2 O 3 binary broadband scattering system with a modified SiO 2 low-adhesive protection interface is proposed. Through pore-size design and a hierarchical porous structure, this method realizes a synergy between cooling performance and anti-dust behavior. Specifically, a probability prediction model based on pore–dust particle interactions was developed to guide the optimized design, limiting the average embedding probability of fine dust to <2%. Meanwhile, the low-adhesive interface reduces the critical detachment force for dust motion to <15% of that for conventional radiative cooling coatings. This characteristic enables water-free self-cleaning functionality that can be achieved under mild wind, effectively resolving the conflict between “ideal suitability of radiative cooling for arid regions” and “water-dependent cleaning mechanisms of hydrophobic materials”. Moreover, the coating exhibited environmental durability through rigorous testing, demonstrating significant potential for scalable and practical applications.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 16
·118705
·
IF 6.3
Xingjie Su,Zepeng Cao,Qianbiao Du,Linzhao Ma,Hao Li
In this research, we successfully synthesized a novel Li 5 Mg 21 TiAl 3 O 30 ceramic via the traditional solid-state reaction. This ceramic, when sintered at 1360 °C, demonstrated favorable microwave dielectric properties (MDPs), characterized by an εᵣ of 10.73, a Q×f of 81,598 GHz (at 12.61 GHz), and a τ f of −27.65 ppm/°C. In addition, the Deep Deterministic Policy Gradient (DDPG) algorithm was employed to optimize a ceramic-based dielectric resonator antenna (DRA) intelligently. Through this approach, the antenna parameters were effectively optimized, achieving a design with a center frequency of 7.90 GHz, a low return loss (S 11 ) of –53.6 dB, and a wide bandwidth of 1050 MHz, and a radiation efficiency of 92.55%, aligning the requirements of the 6 G band. The innovative application of deep learning technology improved the DRA design optimization process, offering a new paradigm for the intelligent design of ceramic-based microwave communication devices.
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危险品化学品经营许可证（带存储）