JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yanfei Wang,Weiran Zhang,Jinping Du,Duan Li,Rongjun Liu
It is urgent to develop thermal barrier coating (TBC) topcoat materials with ultra-low thermal conductivities for next-generation gas turbine engines. A novel pyrochlore-based single-phased ceramic, tuned by codoping of lanthanum zirconate, (La 1-x Y x ) 2 (Zr 1-y Ce y ) 2 O 7 , has been synthesized from the solid state reaction method. The thermal conductivity of (La 1-x Y x ) 2 (Zr 1-y Ce y ) 2 O 7 not only exhibits a temperature-independent trend but also reaches as low as 0.93 W·m −1 ·K −1 , a value that is lowest of fully dense crystalline solids in open literature, attributing to the following two combined effects. The first is the strong scattering of phonons by small-sized Y 3+ cations occupying the oversized atomic cages formed by the distinctive pyrochlore structure. The second is the lattice softening effects arising from larger-sized Ce 4+ substituting Zr 4+ cations. The above two effects act in concert and thus form a glasslike and ultra-low thermal conductivity of (La 1-x Y x ) 2 (Zr 1-y Ce y ) 2 O 7 solid solutions, which is ideal for next-generation TBC topcoat applications.
研究领域:
材料科学
·
工程热物理
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DOI
高影响因子
SOLID STATE SCIENCES
·
2024
·
IF 3.4
Renzhong Xue,Xiaosong Liu,Kun Yang,Tao Li,Haiyang Dai,Jing Chen
In this study, Na 1/3 Cd 1/3 (Bi 1-x Y x ) 1/3 Cu 3 Ti 4 O 12 (NCBYCTO, x = 0−0.20) ceramics were successfully prepared via solid state method. Their microstructure along with the optical, dielectric, and non-Ohmic properties were investigated systemically. It was shown that Y 3+ doping caused the decrease in cation vacancy concentration and the increase in optical energy band. With the increase of Y 3+ content, ceramics exhibited a more stable structure, while their average grain size increased from 6.80 μm to 9.12 μm and then decreased to 2.17 μm with the dopant amount. The relative density increased from 94.7 % for the undoped specimen to 95.6 % for the specimen with x = 0.20. The giant dielectric constant (ɛ′ = 44200) at a relatively low dielectric loss (tanδ = 0.048) at 10 kHz was obtained in the specimen with x = 0.08, being more than three times that of undoped sample and demonstrating the outstanding frequency stability in the range of 40−10 6 Hz. The giant dielectric constant below 10 6 Hz originated from Maxwell–Wagner relaxation related to the insulating grain boundaries (GBs) and followed the internal barrier layer capacitor model. Besides that, Y 3+ doping improved the nonlinearity properties of NCBYCTO ceramics. The specimen with x = 0.20 had the largest nonlinearity coefficient α (∼9.60) and breakdown field strength E b (∼7.15 kV/cm). At last, the nonlinear J-E characteristics were closely related to the GB conductivity activation energy.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Zuodong Liu,Chengwei Zhang,Qiyue Pan,Guo Zhang,Tingting Xiong,Rui Liu,Yongsheng Yu,Peng Liu,Qiangshan Jing
Er, Y:CaF 2 particles were synthesized using the chemical precipitation method, and as-synthesized particles were calcined at different temperatures. Fourier-transform infrared spectra confirmed the elimination of residual nitrates from Er, Y:CaF 2 phosphors calcined at 600 °C. Measurements revealed that the calcined Er, Y:CaF 2 phosphors displayed a single cubic-fluorite crystal structure with regular polygon shapes. We investigated the sensitivity effects of introducing non-active Y 3+ ions as buffers on the luminescence characteristics of Er, Y:CaF 2 phosphors under 488 nm and 980 nm excitation. Two emission bands were detected in luminescence spectra. For phosphors under 980 nm excitation, a three-photon UC mechanism is identified to be involved in the generation of green and red emissions. The findings provide insights into enhancing the 2 H 11/2 / 4 S 3/2 → 4 I 15/2 transitions in Er, Y:CaF 2 phosphors by introducing Y 3+ ions as buffers.
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高影响因子
Catalysts
·
2026
·Vol. 16
·期 4
·364
·
IF 4.5
Lihui Wang,Shao Zhang,Mingming Wang,Zhigang Wang,Xiaoyao Tan
The high-temperature proton ceramic membranes with simultaneous separation of hydrogen and oxygen exhibit promising applications in the catalytic conversion field. However, their separation performance often relies on external electrical circuits, which limits practical application. To overcome this limitation, doping strategies have emerged as a viable approach to develop triple-conducting (H+/e−/O2−) membranes for simultaneous hydrogen and oxygen separation in non-electrochemical mode. In this study, honeycomb-structured hollow fiber membranes were fabricated, and the effects of varying Fe3+and Y3+doping concentrations on hydrogen and oxygen permeation fluxes were systematically investigated. At the Fe3+doping level of 0.2 mol, the oxygen permeation flux of 0.692 mL min−1cm−2in BaCe0.6Zr0.2Fe0.2O3−δ(BCZF) was achieved at 1000 °C, while the hydrogen permeation flux was 0.201 mL min−1cm−2. The BaCe0.55Fe0.05Zr0.2Y0.2O3−δ(Fe-BCZY) hollow fiber membrane can enhance the hydrogen permeation flux by 75% at 1000 °C. Furthermore, during the simultaneous permeation of hydrogen and oxygen, a 1.7-fold enhancement in hydrogen permeation performance was achieved for the Fe-BZCY hollow fiber membrane at 1000 °C, and with oxygen permeation flux of 1.76 mL min−1cm−2at the same temperature. More significantly, a hydrogen permeation flux of 0.34 mL min−1cm−2can be achieved at 700 °C under simultaneous hydrogen and oxygen permeation, which is favorable for the application of membrane reactors in catalytic reactions.
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DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yifei Cao,Haoyu Li,Xinyu Zheng,Siqing Wang,Chunming Zhou,Shiwei Chen,Peng Yang,Tianyuan Zhou,Hao Chen,Le Zhang
Zr 4+ ion doping is an effective method to enhance the optical and mechanical qualities of Y 2 O 3 transparent ceramics. In most previous studies, slowing down densification and inhibiting grain growth of Y 2 O 3 ceramic are generally recognized as the primary function of Zr 4+ additive during sintering. In this work, an interesting simultaneous precipitation phenomenon of Zr 4+ and Y 3+ ions was discovered and it directly led to the refinement of precursors and Y 2 O 3 powders. Consequently, the acting mechanisms of Zr additive should be demonstrated as the synergistic effect of refining precursor, producing oxygen interstitial and promoting solute-drag. Microstructure evolution and optical quality of Zr doped Y 2 O 3 ceramics were further investigated in detail. By doping 3.0 at.% Zr 4+ ions, Y 2 O 3 transparent ceramics with a transmittance as high as 82.3% at 1064 nm could be realized, after sintering at 1775 °C for 8h in vacuum. In general, this essential synergistic effect should be adequately considered in the preparation of heterogeneous ion doped transparent ceramics using the co-precipitation method.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Lingfeng Shi,Ziwei Liu,Ke Li,Yanbin Ning,Shengwei Dong,Shenglu Geng,Mengjie Zhang,Yulin Ma,Geping Yin,Zhenjiang Yu,Shuaifeng Lou,Hua Huo
O3-NaNi 1/3 Fe 1/3 Mn 1/3 O 2 cathodes are promising candidates for sodium-ion batteries benefited of the high theoretical capacity. However, the inherently poor electronic conductivity limits rate performance and aggravates O3-P3 phase transition, further weakens phase transition reversibility and results in structural degradation. Herein, a localized electronic regulation strategy inspired by yttrium iron garnet (YIG) is employed to address the issue of sluggish electron transport. Specifically, Y 3+ ions are utilized to partially substitute Ni 2+ to rearrange the electronic configuration of Fe 3 d orbitals, which could trigger a transition from high-spin state ( t 2 g 3 e g 2 ) to low-spin state ( t 2 g 5 e g 0 ) as well as narrow the band gap due to the asymmetric splitting of the t 2 g ∗ band near the Fermi level. Moreover, the large ionic radius tends to construct a concentration gradient of Y 3+ , thereby generating a long-range built-in electric field. Benefiting from the improved electrical conductivity, Y0.25-NFM performs 64 mAh g −1 reversible capacity at 20 C, also the enhanced reversible phase transitions assist Y0.25-NFM maintains 80.9% of initial capacity at 1 C for 500 cycles (44.7% for baseline NFM). The thorough understanding of the dual regulatory effects for Y 3+ doping on short & long-range electronic interactions provides a novel strategy to construct outstanding layered oxide cathodes for advanced SIBs.
研究领域:
材料科学
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电化学
·
储能技术
·
固态物理
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Shuang Zou,Yi-li Zhang,Li-li Du,Wei-jia Song,Qi-qun Lei,Xu-qiao Hu,Peng-fei Wang,Min Zhu,Zhe Gong,Zhuo Li
Due to its outstanding ecological compatibility, abundant resource reserves, and inherent high safety, aqueous zinc-ion batteries (AZIBs) have become a highly promising candidate system in the field of large-scale energy storage. However, the uncontrollable dendrite growth and corrosion side reactions at the zinc anode severely limit its cycle life and practical application. To overcome these bottlenecks, the present work employs rare earth yttrium ions (Y 3+ ) as a structural regulator in the electrolyte. This innovative mechanism was revealed through experimental analysis and theoretical calculation: Y 3+ reconfigures the [Zn (H 2 O) 6 ] 2+ solvation shell, drives the ordered desolvation of Zn 2+ , and simultaneously inhibits dendrite nucleation, the hydrogen evolution reaction (HER), and interfacial by-product formation. This strategy significantly improves the interface stability. At 1 mAh·cm −2 , the symmetric cell achieved a 99.1% coulombic efficiency (CE) for zinc deposition/extraction and an ultra-long cycle life of 260 h. The performance of the full cell using vanadium-based cathode material (NVO) has achieved a synergistic improvement. Specifically, at a current density of 1 A·g −1 , its capacity retention rate reached 96.8% (an increase of 14.5% compared to the ZSO electrolyte) after 300 cycles of testing. Meanwhile, the specific capacity remained stable at 273 mAh·g −1 throughout the entire cycle, demonstrating excellent cycle stability and capacity retention ability. This study aims to explore the potential role of the “cationic competitive solvation” mechanism in improving the cycle stability of AZIBs, with the hope of providing a possible solution to related problems.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yingxin Li,Wei Qian,Yinqun Hua,Yunxia Ye,Fengze Dai,Jie Cai
Thermal barrier coatings with excellent thermal performance and corrosion resistance are essential for improving the performance of aero-engines. In this paper, (Y 3-x Yb x )(Al 5-x Sc x )O 12 (x = 0, 0.1, 0.2, 0.3) thermal barrier coating materials were synthesized by a combination of sol-gel method and ball milling refinement method. The thermal properties of the (Y 3-x Yb x )(Al 5-x Sc x )O 12 ceramics were significantly improved by increasing Yb and Sc doping content. Among designed ceramics, (Y 2.8 Yb 0.2 )(Al 4.8 Sc 0.2 )O 12 (YS-YAG) showed the lowest thermal conductivity (1.58 Wm −1 K −1 , at 800 °C) and the highest thermal expansion coefficient (10.7 × 10 −6 K −1 , at 1000 °C). In addition, calcium-magnesium- aluminum -silicate (CMAS) corrosion resistance of YS-YAG was further investigated. It was observed that YS-YAG ceramic effectively prevented CMAS corrosion due to its chemical inertness to CMAS as well as its unique and complex structure. Due to the excellent thermal properties and CMAS corrosion resistance, YS-YAG is considered to be prospective material for thermal barrier coatings.
研究领域:
材料科学
·
航空工程
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DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 17
·5718-5724
·
IF 7.367
Lei Lei,Shengjun Zhang,Han Xia,Ying Tian,Junjie Zhang,Shiqing Xu
Developing multicolor-emitting materials has significant value in many research fields such as displays, bioimaging, and information storage. The widely adopted strategies to realize multicolor emission are tuning the material composition, phase, and size. Herein, the emission color was continuously controlled from yellow to pink by simply changing the excitation wavelength from 254 nm to 365 nm for Tb3+/Eu3+ co-doped Gd2O2S NCs. The Gd2O2S NCs with different morphologies, including nanoplate with various sizes and flower-like, were successfully prepared by seed-mediated, Na+/Y3+ co-doped, and S concentration-tuned methods. The results indicated that Na+ ions greatly promote the growth of Gd2O2S NCs and Y3+ ions have an impact on their shape. Moreover, the PL intensity of the 2%Eu-doped flower-like Na/Y:Gd2O2S (F-NYG) NCs decreased by about 24.7%, 6.8%, and 5.1% under 254 nm, 316 nm, and 348 nm excitation, respectively; this is due to less non-radiative relaxation paths above the excited state of Eu3+:5D0 at longer excitation wavelength, which result in a decreased degree of the PL intensity reduction.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
生物成像
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）