CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 12
·16773-16777
·
IF 5.532
Yi Ding,Zhen Li,Zimei Bai,Zhengdi Jiang,Zhenyu Chen,Xuanrui Zhang,Chao Lu,Hui Dan,Tao Duan
Rapid preparation of ceramic waste form at low temperature is of great engineering significance for immobilization of high-level radioactive waste . Herein, we demonstrated that Nd-doped zirconia ceramics can be rapidly prepared at low sintering temperature with the assistance of hydrothermal assisted sol-gel method. The effects of sintering temperature and Nd content on the phase and microstructure evolutions of the obtained ceramics were studied. With the increasing content of Nd, the phase of ZrO 2 transformed from monoclinic to cubic at first, then the pyrochlore Nd 2 Zr 2 O 7 phase appeared, and finally hexagonal neodymia solid solution structure formed. Moreover, the grain size and compactness of the obtained ceramics increased with the increment in sintering temperature. The successful accommodation of Nd within the ZrO 2 lattice was revealed by the detected increase of cell parameters. This work demonstrated that the hydrothermal assisted sol-gel process can be employed to effectively synthesize the Nd-doped zirconia ceramics as potential hosts for HLW immobilization.
研究领域:
材料科学
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核废物管理
·
陶瓷工程
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70338
·
IF 3.8
Yuanyuan Li,Hongbing Yang,Yilei Huang,Shichang Cheng,Chang-An Wang,Yanhao Dong
As a pivotal optical material, the microstructure of YAG (yttrium aluminum garnet) nanocrystalline ceramics directly determines their laser and luminescent performance. This study demonstrates that rare-earth doping at grain boundaries significantly improves sintering behavior through a dual-stage regulation mechanism: during the initial stage (relative density 65%–90%), dopants (Nd/Ce) suppress mass diffusion by stabilizing grain boundary structures; whereas in the intermediate stage (75-85% relative density), they enhance diffusion by modifying grain boundary energy states. This kinetic regulation enables Nd-doped samples to achieve 99.3% relative density at 1200°C (50°C lower than pure YAG) while maintaining grain size at 57–64 nm. The doped systems achieved the requisite thermodynamic state for successful two-step sintering at significantly lower T 1 temperatures (Nd-YAG: 1175°C, Ce-YAG: 1175°C) compared with pure YAG (1200°C). The study confirms that Nd/Ce doping achieves coordinated densification-grain growth control through grain boundary segregation, providing critical theoretical guidance for fabricating high-performance transparent ceramics, particularly for developing novel Nd/Ce:YAG laser and scintillation ceramics.
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OPTICS COMMUNICATIONS
·
2014
·
IF 1.542
Li Hu,Jinli Zhang,Qiang Yin,Peijie Li,Kai Du
Nd(bfa) 3 (TPPO) 2 , Nd(tta) 3 (TPPO) 2 and Nd(β-nta) 3 (TPPO) 2 (bfa: 4,4,4-Trifluoro-1-phenyl-1,3-butanedione, tta: 4,4,4-Trifluoro-1-(2-thienyl)-1,3-butanedione, β-nta: 4,4,4-Trifluoro-1-naphthyl-1,3-butanedione, TPPO: triphenylphosphine oxide), three kinds of Nd(III) ternary complexes, were synthesized using β-diketonates and triphenylphosphine oxide as ligands. Fluorescence properties (including excitation spectra, emission spectra , emission lifetime, quantum yield, etc.) and thermal stabilities of the complexes were studied. Nd(tta) 3 (TPPO) 2 having the sharpest emission band, highest relative emission intensity and shortest fluorescence lifetime shows that it will be a kind of promising material for applications in near infrared immunoassay, laser active medium and optical fibers .
研究领域:
化学
·
光学
·
材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zeinab Marfavi,Ruihao Yang,Lingbo Wei,Yijun Han,Quanjie Lv,Yingfan Dai,Kang Sun,Congli Yuan,Ke Tao
Day–night photocatalysts that can persistently generate reactive oxygen species (ROS) after ceasing light attracted intensive attention in diverse fields. However, current strategies of combining a photocatalyst and an energy storage material can hardly fulfill the demands, especially in size. We herein present a one-phase sub-5 nm day–night photocatalyst via simply doping Nd, Tm, or Er into YVO4:Eu3+ nanoparticles, efficiently producing ROS in both day and night modes. We demonstrate that the rare earth ions acted as a ROS generator, and Eu3+ and defects contributed to the long persistency. Furthermore, the ultrasmall size led to remarkable bacterial uptake and bactericidal efficacy. Our finding suggests an alternative mechanism of day–night photocatalysts that could be ultrasmall and thus may shed light on disinfection and other applications.
研究领域:
材料科学
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纳米技术
·
光催化
·
环境科学
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Zhenfeng Xiong,Ying Huang,Nan Li,Chaozhi Zhang,Yonghua Li,Zhuo Yang,Weidong Zhou,Kemei Zhou,Rong Zha,Changdong Sheng
Recovery of rare-earth elements (REEs), especially those of Dy and Nd, from Nd–Fe–B permanent magnets is crucial for sustainable development. Herein, an unsymmetrical pentanediamide extractant, N,N′-dimethyl-N,N′-didecyl-3-oxapentanediamide (DMDDOPDA), was synthesized and characterized for the effective extraction of Dy(III) and Nd(III). DMDDOPDA can form coordination bonds with metal ions because of the strong electron-donating abilities of the N and O atoms. The coordination sites might be inclined toward one side during the extraction. DMDDOPDA exhibited superior extraction performance in the HNO3 system than it did in the HCl system. The highest extraction efficiencies of Dy(III) and Nd(III) under optimal conditions were 99.9% and 99.5%, respectively, while their optimum stripping efficiencies were 100% and 85.3%, respectively. DMDDOPDA extraction of Dy(III) and Nd(III) in the four investigated diluents involved the formation of a neutral coordination complex. This study provides new insights into REE extraction using pentanediamide extractants.
研究领域:
化学工程
·
材料科学
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高影响因子
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
·
2017
·Vol. 21
·期 10
·665-670
·
IF 1.043
Jianyu Hua,Lixin Zang,Huimin Zhao,Ting Liu,Ming Fan,Tong Chen,Zhengyu Cao,Ye Tian,Zhiguo Zhang
This paper studies the origin of fluorescence emissions of metalloporphyrins. The absorption spectrum of neodymium-coordinated hematoporphyrin monomethyl ether (Nd-HMME) was found to have four Q bands, which is different from the accepted knowledge (two Q bands). The absorbance of Nd-HMME was comparable to the corresponding absorbance of HMME at wavelengths of 538 nm and 572 nm, but the absorbance of Nd-HMME at wavelengths of 502 nm and 622 nm was approximately 1/30 of that at 572 nm. The doping of Nd 3+ enhanced the symmetry of HMME, and led to changes in energy level properties. Moreover, Nd-HMME still exhibited two fluorescence peaks at 624 nm and 686 nm, similar to HMME, which can be explained by the observation of a weak absorption peak of Nd-HMME at 622 nm.
研究领域:
化学
·
光谱学
·
材料科学
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2011
·
IF 2.089
Yu-Feng Hu,Xiao-Ming Peng,Shan Ling,Jin-Zhu Zhang,Chuan-Wei Jin
Conductivities were measured for the ternary systems Y(NO3)3 + Ce(NO3)3 + H2O, Y(NO3)3 + Nd(NO3)3 + H2O, and Ce(NO3)3 + Nd(NO3)3 + H2O and their binary subsystems Y(NO3)3 + H2O, Ce(NO3)3 + H2O, and Nd(NO3)3 + H2O at (293.15, 298.15, and 308.15) K. The measured conductivities were used to test the generalized Young’s rule and the semi-ideal solution theory. The comparison results show that the generalized Young’s rule and the semi-ideal solution theory can yield good predictions for the conductivities of the ternary electrolyte solutions, implying that the conductivities of aqueous solutions of (1:3 + 1:3) electrolyte mixtures can be well predicted from those of their constituent binary solutions by the simple equations.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hongyu Lu,Yang Lu,Difan Lin,Jiang Zhu,Yangyang Du,Hua Zou
Luminescent materials usually suffer from thermal quenching at high temperature due to the aggravation of nonradiation relaxations. Herein, a giant enhancement of up conversion (UC) luminescence is observed in negative thermal expansion (NTE) Y 2 W 3 O 12 :Nd phosphor upon increasing the temperature from 310 to 790 K. In addition, the temperature-dependent UC emission is reversible. To penetrate into the mechanisms, the temperature-dependent luminescence intensity and lifetime are investigated for Nd doped negative and positive thermal expansion (PTE) phosphors. Based these investigation, we infer that the underlying mechanism of the giant enhancement for Y 2 W 3 O 12 :Nd phosphor are due to combined effects of phonon assisted absorptions and contraction of NTE crystals. Moreover, the observation of temperature-dependent near-infrared spectra (NIR) can support the mechanism from the other side. The present findings pave the way to overcome thermal quenching of Nd 3+ ions and explore new thermal enhancement materials sensitized by Nd 3+ ions.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Shah Noor,Xiaoshuai Yu,Chunlin Li,Lei Sun,Zibo Zhao,Yan Liu,Chun Cheng Yang,Guoyong Wang
The rational design of high-performance electrocatalysts is essential for promoting the industrialization of electrocatalytic water-splitting technology. Herein, nitrogen-defects (Nd)-enriched g-C 3 N 4 (CN)-supported cobalt single-atom catalysts (Co-Nd/CN) are fabricated as high-efficiency bifunctional electrocatalysts for water splitting. Abundant Nd improves substrate conductivity and modulates the electronic structure of Co-N x active sites simultaneously. Benefiting from abundant coordination sites, lower charge transfer dynamics, and surface reactions, the optimized Co-Nd/CN exhibits the lowest overpotentials of 172 and 310 mV vs. RHE for HER and OER, respectively, at 10 mA cm −2 . Additionally, Co-Nd/CN delivers a full-cell voltage of 1.53 V at 10 mA cm −2 for overall water splitting with a Faradaic efficiency of 87.5%. Extended durability measurements demonstrate robust catalytic stability for Co-Nd/CN over 100 h of continuous operation. This work puts forward a novel approach based on elemental doping and defect engineering for the design of effective and enduring catalysts for water splitting.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 15
·118583
·
IF 6.3
Qinghu Guo,Ting Wang,Jinglong Fan,Yimang Zhao,Xiangyu Meng,Xiaoyi Gao,Zhonghua Yao,Weiping Gong,Hanxing Liu,Hua Hao,Shujun Zhang
Electrostrictive ceramics are crucial for high-precision actuators due to their low hysteresis, fast response, and low heat dissipation. In this work, Nd 3+ was strategically employed to optimize the electrostrictive properties of x Nd-doped Pb(Ni 1/3 Nb 2/3 )O 3 -PbZrO 3 -PbTiO 3 (PNN-PZ-PT) ceramics. A phase transition from the morphotropic phase boundary to a cubic structure, accompanied by enhanced dielectric relaxor behavior was observed with increasing Nd content, which can be attributed to the disruption of long-range ordered ferroelectric domains caused by aliovalent Nd doping-induced local structural heterogeneities—thereby reducing strain hysteresis and enabling improved electrostrictive response. Notably, outstanding electrostrictive strain of 0.105% and high electrostrictive coefficient M 33 = 10.5 × 10 −16 m 2 /V 2 were obtained under a 10 kV/cm for the 3%Nd-doped PNN-PZ-PT ceramic, superior to other relaxor ferroelectric ceramics. Additionally, this composition exhibits outstanding cycling reliability with only 5% strain degradation over 10 6 electrical cycles, positioning it as a promising candidate for precision micro-actuators applications requiring ultra-stable, high-efficiency electromechanical responses.
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Nature Communications
·
2025
·Vol. 16
·期 1
·10998
·
IF 15.7
Feng Yong,Wang Jianhua,Feng Kun,Xu Bai,Xu Jiabin,Li Shuo,Lu Cheng,Fan Xing,Lin Haiping,Zhong Jun
Proton-exchange membrane water electrolysis in acidic solutions holds great promise for advancing the green-hydrogen economy but limited by using precious-metal catalysts. Here, we develop a low-cost Co 3 O 4 -based catalyst with oxygen vacancies and Nd-insertion (Nd-CoO x ). This catalyst achieves a low overpotential of 317 mV at 10 mA cm −2 for acidic oxygen evolution reaction and remains stable over 800 h. The oxygen vacancies in Nd-CoO x enhance its catalytic activity, while Nd enables the long-term stability through a flexible “breathing mode” during oxygen evolution reaction, as revealed by in-situ methods such as X-ray absorption spectroscopy and Raman spectroscopy. The presence of Nd also improves the catalytic activity with the oxide path mechanism. This favorable strategy can be extended to other lanthanides. When used as the anode, Nd-CoO x delivers good performance in water electrolysis to achieve 200 mA cm −2 at a low cell voltage of 1.69 V with low degradation over 100 h, and can reach 1 and 2 A cm −2 at 1.93 V and 2.12 V, respectively.
研究领域:
电催化
·
可再生能源
·
材料科学
·
氢气生产
·
水电解
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jin Liu,Yuyao Chen,Yue Shi,Bin Song,Jing Wang,Chong Zhang,Dan Zhang,Yuanyuan Feng
The development of hydrogen evolution reaction (HER) catalysts that combine high activity with high current density stability is an important step in promoting the scale-up preparation of green hydrogen in anion exchange membrane water electrolyzer (AEMWE). In this paper, we propose an asymmetrical “Nd−O–Ru” bridge active sites strategy in the rapid construction of rare earth metal oxides (M x O y , M = Nd, Ce) and ruthenium heterojunctions (M x O y @Ru/CNT, CNT stands for carbon nanotube) catalysts by a solvent-free microwave method. Experiments show that the catalyst exhibits excellent HER performance in alkaline media: driving 10 mA cm −2 and 1000 mA cm −2 only requires ultra-low overpotentials of 20 mV and 363 mV, and operates stably for 100 h at 1000 mA cm −2 . The combination of in situ Raman spectroscopy and theory calculations reveals that the p orbital of oxygen at the interface acts as an electronic bridge to mediate the coupling of the f orbital of Nd to the d orbital of Ru through “Nd−O–Ru” bridge enhancing the adsorption of water molecules while synergistically optimizing the free energy of hydrogen adsorption (ΔG H∗ ) and accelerating the kinetics of hydrolysis dissociation. Integrating this catalyst into the AEMWE yields current densities of 500 and 1000 mA cm −2 at voltages of 1.665 V and 1.806 V, respectively, thus offering a novel material design paradigm for industrial-scale water electrolysis. This study opens a new path for rational design of efficient energy conversion catalysts through orbital coupling engineering.
研究领域:
催化化学
·
材料科学
·
电化学
·
能量转换
·
纳米材料
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高影响因子
危险品化学品经营许可证（带存储）