JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Wang Haitao,Liu Xiang,Gu Xin,Wang Yao,Wang Zhenyu,Chen Zihao,Liang Xiaolu,Luo Yuping,Tan Songlin
Y 2 O 3 : MgO (YMO) composite materials exhibit outstanding optical and thermal stability, and are widely used in optics, catalysis, ceramics and other fields. Attaining high-performance YMO materials hinges upon the use of high purity finely ground raw materials, precise component ratios, and uniform distribution. In this study, YMO composite nanoparticles with a volume ratio of 50:50 were synthesized using oxidizer (magnesium nitrate hexahydrate and yttrium nitrate hexahydrate) and fuel (citric acid). Optimizing the particle size and specific surface area of the nanoparticle was achieved by adjusting the oxidizer to fuel ratio ( O/F ) in the precursor (the molar ratio ranges from 0.18 to 0.33), and the optimal O/F was obtained. When the molar ratio is at 0.28, nanoparticles with particle size of 14 nm and specific surface area of 44 m 2 /g are synthesized. Furthermore, this study revealed that nanoparticles synthesized at different molar ratios of O/F produce different agglomeration degree after calcination at 800 °C, with the agglomeration factor (AF) gradually decreasing as the molar ratio of citric acid to nitrate increases; the results show that AF is at least 2.0 when O/F = 0.28.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 8
·11637-11643
·
IF 4.527
Ying Wang,Jun Wang,Meng Ni,Peng Liu,Jian Zhang,Kuo Yang Lee,Hsing-I Hsiang,Zhili Dong,Dingyuan Tang
Y 2 O 3 transparent ceramics were fabricated by using vacuum sintering followed by hot isostatic pressing (HIPing). After HIP, large pores were eliminated, but a certain amount of nano-sized pores survived. Air annealing is required to bleach the as-HIPed ceramics. However, the annealing temperatures affected the transparency by affecting the evolution of the residual nano-pores. A high annealing temperature of ≥1600 °C resulted in obvious pore growth and loss of transparency of the samples. Pressure-less thermal expansion and shrinkage behaviors of the as-HIPed Y 2 O 3 ceramics were studied in detail. The high annealing temperature (1600 °C) could lead to obvious swelling of both the pore sizes and the dimensions of the samples. It implies that the swelling of pores is not only from the diffusion and aggregation of the existing smaller pores, but may also from the thermal expansion of the high-pressure precipitated insoluble gas.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yongjia Liang,Jianliang Zuo,Zhaohao Cai,Weican Huang,Jing Lin,Zili Liu
The ability to effectively control furan ring opening is the key to transforming furfural into 1,5-pentanediol. Herein, a series of Co-based catalysts modified with rare-earth metals (Y, Pr, La, and Ce) were synthesized. It was found that Y-modified Co-based catalyst with a Co/Y molar ratio of 3.5/0.5 exhibited the highest selectivity for 1,5-pentanediol (53.7%) at 150 °C and 4 MPa H2 in isopropanol (time = 5 h). Coordination between Co and Y in the catalyst resulted in more CoOx and oxygen vacancies, which are vital factors for cleaving the C–O bond of the furan ring. In addition, highly dispersed small-sized Co0 particles on the catalyst surface could boost the dissociation of H2 molecules, which attacked the carbonyl group in the furan ring of furfural to afford 1,5-pentanediol. Density functional theory calculations revealed that the presence of CoOx/Y2O3 oxide interfaces promoted adsorption of furfural (especially via the furan ring) and hydrogenolysis during the hydrogenation process. Modifying a Co-based catalyst with rare-earth metals offers a novel approach for producing 1,5-pentanediol from furfural.
研究领域:
催化化学
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材料科学
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能源化学
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Qiufeng Liu,Kaihang Sun,Kun Lu,Xingwei Xie,Longzhou Zhang,Young Dok Kim,Zhongyi Liu,Zhikun Peng
Metal-support interaction (MSI) is an efficient strategy to modulate the distribution of active metal with different electronic states over the oxide-supported metal catalysts. However, the intrinsic correlation between the intensity of MSI and the electronic structure of supported metals remains inadequate. In this work, the intensity of MSI over the Cu/Y 2 O 3 catalyst was tuned by the calcination temperature, which regulated the distribution of Cu 0 , Cu + and Cu 2+ species. The Cu/Y 2 O 3 catalyst with the highest amount of Cu + exhibits the superior performance of reverse water–gas shift reaction. Due to the enhanced H 2 activation and promoted charge transfer at the interfacial Cu + /Y 2 O 3 site based on the experimental characterizations, the CO formation rate reached 220 mmol CO g cat −1 h −1 at 500 °C. The present work provides an efficient way to regulate the supported metal species with the specific electronic state.
研究领域:
催化化学
·
材料科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Ming Qiang,Kai Li,Jia Tong,Bingheng Sun,Yanna Tian,Ge Zhang,Xiaomeng Yin,Jintai Fan,Long Zhang
YM nanocomposite ceramics, featuring high transmittance and low emissivity in the 3-5 μm range, is considered a promising candidate for infrared window applications. Powder synthesis and ceramic sintering are currently key areas of research. In this study, a glycine-nitrate combustion method combined with air pre-sintering and hot isostatic pressing was employed to successfully prepare nanopowders with an average grain size of ∼20 nm and dense nanocomposite ceramics with an average grain size of ∼170 nm. This method allows for the fabrication of samples with various sizes and shapes. The effects of glycine as fuel on powder and ceramic properties were investigated. At a glycine-to-nitrate ratio (N/G) of 0.7, the YM ceramics exhibited a transmittance above 80% and an emissivity approach 2% at 600 °C in the 3-5 μm range. Besides, for the first time, the differences and influencing factors in emissivity were comparatively analyzed. The ceramic also demonstrated a flexural strength of 300-500 MPa at room temperature. Finally, the transmittance, emissivity, and imaging performance of the YM composite ceramics were systematically compared with those of conventional infrared window materials. These findings are rarely reported and provide a valuable reference for future research and application of infrared window materials.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Baojun Han,Yang Yang,Hao Deng,Yaowu Chen,Chubin Yang
Yttrium oxide (Y 2 O 3 ) nanoparticles were added to the electrolyte during the preparation of a plasma-electrolytic-oxidation (PEO) coating on the AZ91 Mg alloy. The effects of the Y 2 O 3 nanoparticles on the microstructure, phase components, chemical compositions, and mechanical properties of the PEO coating were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and microhardness tests. Furthermore, the corrosion resistance of the PEO coating was evaluated by pote ntiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The results indicated that the Y 2 O 3 nanoparticles had been incorporated into the PEO coating and that the number of micropores and cracks in the coating was dramatically decreased. The microhardness of the PEO coating was more than 10 times higher than that of the AZ91 Mg substrate, and the corrosion current density decreased by approximately three orders of magnitude when 3 g/L of Y 2 O 3 nanoparticles was added to the corresponding electrolyte.
研究领域:
材料科学
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表面工程
·
生物医用材料
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腐蚀与防护
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纳米复合涂层
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Xiaokai Li,Xiaojian Mao,Minghui Feng,Junxi Xie,Benxue Jiang,Long Zhang
ZrO 2 is considered an efficient sintering additive for transparent Y 2 O 3 ceramics. However, the doping of tetravalent Zr 4+ ions leads to a dark brown color of the ceramic after vacuum sintering. In this study, the optical properties of vacuum-sintered and air-annealed ceramics were characterized using transmittance spectra and a Commission International de l’Eclairage (CIE) diagram. The corresponding defects are investigated by electron paramagnetic resonance (EPR) spectra. The band gap of the vacuum-sintered samples is 2.72 eV, which is much smaller than that of the annealed sample. The results reveal that the V O + (F + center) and Zr 3+ defects form transition energy levels near the top of the valence band and at the bottom of the conduction band , respectively. The color-related absorption is mainly attributed to the electronic transfer from the Zr 3+ level to the conduction band and from the F + center to the Zr 3+ level.
研究领域:
材料科学
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无机非金属材料
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光学材料
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陶瓷材料
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固体物理
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ying Zhou,Xinghua Shi,Zhenhua Ge,Jing Feng
In this current study, Sm 3 TaO 7 was used as the second phase to fabricate a composite ceramic with 7 wt.% Y 2 O 3 –ZrO 2 (7YSZ). Effective phonon scattering was achieved by controlling the content of the second phase Sm 3 TaO 7 , which significantly reduced the thermal conductivity . The results show that Sm 3 TaO 7 /7YSZ ceramics have a minimum thermal conductivity of 0.81 W m −1 K −1 at 900 °C. The minimum thermal conductivity of the composite was 50% lower than that of 7YSZ. The maximum thermal expansion coefficient was obtained for 5 wt.% Sm 3 TaO 7 /7YSZ ceramics (12.1 × 10 −6 K −1 , 1200 °C), which was much higher than that for 7YSZ (∼10.0 × 10 −6 K −1 ). The hardness and Young's modulus of 5 wt.% Sm 3 TaO 7 /7YSZ ceramics were much lower than those of 7YSZ, which is clearly attributable to the low modulus and hardness of Sm 3 TaO 7 . Our experimental results showed that the 5 wt.% Sm 3 TaO 7 /7YSZ ceramics are excellent thermal barrier coating materials.
研究领域:
材料科学
·
热力学
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Canglong Wang,Zhaocang Meng,Jianke Tian,Yiwen Liu,Yafeng Shu,Haibo Wu,Lei Yang
Given the wide prospects for SiC ceramic with high thermal conductivity, high-throughput screening of SiC containing BeO-Y 2 O 3 -Al 2 O 3 -MgO additives has been implemented by the experimental and multiscale simulation investigation. About 16 groups of SiC prepared by SPS are composed of 4H-SiC, 6H-SiC, 3C-SiC, BeO and yttrium aluminum garnet phases, and exhibit equiaxed and columnar microstructures. It was verified by the density functional theory simulation that these dopants (Be, O, Mg, Al and Y) can migrate spontaneously towards the Σ13 (150) [001] GB. The ceramics with thermal conductivity higher than 120 W/(m·K) were screened out. Especially, the annealed SiC with 5%BeO-10 % additive exhibits the maximum thermal conductivity of 206.5 W/(m·K). The Vickers hardness about 16.89 GPa can be predicted by the macro finite element model simulation, which is accorded with the experimental result. This work provides an economically feasible project for the large-scale production of SiC ceramics with high thermal conductivity.
研究领域:
材料科学
·
计算材料学
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2012
·Vol. 12
·期 3
·2767-2773
·
IF 1.563
Zou Xing,Liu Jie,Peng Yingjie,Xu Bo,Yu Xibin
Uniform Y2O3 nanorods, nanosheets, nanotubes and nanoshperes were controllably synthesized via an urea-based homogeneous precipitation and hydrothermal synthesis through choosing appropriate yttrium sources, the water/ethanol ratio of mixed solvents and precipitators.
The nanopheres and nanotubes were obtained through homogeneous precipitation method using soluble yttrium nitrate as the yttrium source. The nanosheets and nanorods were obtained via a facile hydrothermal synthetic method using yttrium chloride and yttrium acetate as the yttrium source. During
these experiments Urea and NaOH were used as precipitators and added in correct order. We also studied the spectroscopic properties of Y2O3:Eu3+ phosphor. The Eu3+ ion mainly shows its characteristic red (611 nm, 5D0 →
7F2) emissions in all kinds of morphologies Y2O3:Eu3+ phosphor, but emission intensity are different. It can be explain from the viewpoint of their different absorption properties closely related to their micro-morphologies.
研究领域:
材料科学
·
光学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Fangqing Liu,Xiaoyi Lu,Chenglong Shi,Di Wang,Tingting Cui,Zhipeng Sun
Developing high-efficiency non-precious metal-based catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a major task for Zinc-air batteries (ZABs). Cobalt-based catalysts have been regarded as promising catalysts owing to the multivalence characteristic of the Co element, however, there remains the agglomeration of Co particles during the high-temperature calcination process and the strong adsorption of oxygen intermediates. Herein, the synthesis of Y 2 O 3 -La 2 O 3 co-modified Co nanoparticles embedded within the porous N-doped carbon substrate derived from a metal-organic framework precursor is reported ((Y 1 La 1 )O/Co-NC). Notably, this strategy allows Y 2 O 3 -La 2 O 3 to uniformly distribute around Co nanoparticles and to form intimate Y 2 O 3 -La 2 O 3 /Co interface sites. Benefiting from Y 2 O 3 -La 2 O 3 co-modification, the synergistic effect of the heterostructures, and abundant active sites, the optimized (Y 1 La 1 )O/Co-NC catalysts exhibit a higher half-wave potential (E 1/2 = 0.845 V) than commercial Pt/C (E 1/2 = 0.828 V). In addition, the potential gap between OER and ORR potentials is 0.78 V. As a cathode catalyst for ZABs, (Y 1 La 1 )O/Co-NC achieved a specific capacity of 955.73 mAh g −1 . Theoretical calculations have also revealed that the introduction of Y₂O₃ and La 2 O 3 promotes electron transfer and increases the electron density at Co sites. The interface effect of Y 2 O 3 -La 2 O 3 /Co optimizes the adsorption strength of oxygen intermediates, significantly reduces the reaction energy barrier, and enhances oxygen electrocatalysis. This study offers significant insights into the strategy of employing rare earth metals to boost the performance of cobalt-based catalysts in ZABs.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 9
·4304-4308
·
IF 3.784
Shuixian Yang,Jianmin Li,Hao Guo,Xiaojian Mao,Run Tian,Jian Zhang,Shiwei Wang
In this study, highly transparent aluminate oxynitride (AlON) ceramics were prepared via the reactive sintering of Al 2 O 3 and AlN powders using a Y 2 O 3 -MgAl 2 O 4 -H 3 BO 3 ternary sintering additive. The ternary doping process resulted in the efficient preparation of transparent AlON ceramics with small grains and high transmittance as compared to the binary doping (Y 2 O 3 -MgAl 2 O 4 ) process. The addition of 0.1 wt.% Y 2 O 3 -0.4 wt.% MgAl 2 O 4 -0.12 wt.% H 3 BO 3 resulted in the formation of a 4-mm-thick AlON ceramic with high transmittance (81% at 600 nm) and low haze (3.46%). This is the best performance in terms of the thickness and transmittance reported for AlON transparent ceramics prepared by the reactive sintering method.
研究领域:
材料科学
·
陶瓷
·
光学材料
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高影响因子
危险品化学品经营许可证（带存储）