JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 11
·6863-6871
·
IF 3.094
Xiaojun Tan,Shoulei Xu,Xiangyu Wang,Fenhong Liu,Bernard A. Goodman,Dingkang Xiong,Wen Deng
Single crystals of yttria-stabilized zirconia (YSZ) doped with various concentrations of Sm 2 O 3 were synthesized by the optical floating zone method, and their structure and spectroscopic properties characterized using powder X-ray diffraction (XRD), optical absorption, and luminescence measurements. XRD showed that the cubic phase of ZrO 2 was stabilized by addition of Y 2 O 3 and a series of absorption peaks characteristic of Sm 3+ was detected by UV-visible absorption spectroscopy. Three phenomenological J-O oscillator strength parameters Ω t ( t = 2, 4, 6) were calculated to evaluate the local structure and bonding in the vicinity of the Sm 3+ for the 0.75 mol% Sm 2 O 3 : YSZ sample. These were in order of Ω 2 < Ω 4 < Ω 6 with values of Ω 2 = 5.46 × 10 −20 cm 2 , Ω 4 = 10.70 × 10 −20 cm 2 , and Ω 6 = 12.67 × 10 −20 cm 2 , and indicate a relatively high symmetry and low covalent character for the Sm-O bond at the Sm 3+ sites in the YSZ matrix. Photoluminescence spectra recorded under an excitation of 404 nm showed four emission bands centered at 571 nm, 621 nm, 652 nm, and 716 nm corresponding to the transitions 4 G 5/2 → 6 H j ( j = 5/2, 7/2, 9/2, 11/2). The transition probability, lifetime, and branching ratio obtained from the emission spectrum of the 0.75 mol% Sm 2 O 3 : YSZ crystal showed that YSZ is a potential host for Sm 3+ to achieve a reddish-orange laser output, and the Sm 3+ -modified YSZ crystals have a possible use in reddish-orange laser and lighting devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Xiaoling Ma,Zhenlin Lv,Hongbin Tan,Caixia Wang,Lingyu Li,Yixia Wang
Yttrium aluminum garnet (YAG) nano-fibers were obtained by electrospinning using aluminum and yttrium nitrates as initial materials. Coordination agent and spinning additive influences on sol spinnability were analyzed. A stable spinning precursor sol was prepared using citric acid as a coordination agent and polyvinyl butyral as a spinning additive. Linear links were formed in precursor sol ∼4 nm in diameter. Spinning voltage effect on the fiber diameter was also studied. YAG phase was obtained after the gel fibers were sintered at 800 °C. The nano-fibers with diameter of 80–200 nm were prepared at 24 kV. YAG crystal grains were linked together forming nano-fibers.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2019
·
IF 1.293
Renxin Xu,Huan Yang,Huajun Sun,Jing Zhou,Zhijun Yue,Xinhua Gao
Mg 0 . 2 Mn 0 . 8 Y x Fe 2 − x O 4 ( x = 0 . 0 0 0 , 0.025, 0.050 and 0.075) nanocrystalline is synthesized via hydrothermal technique. Single cubic spinel phase is confirmed by XRD and the formation of Mg 0 . 2 Mn 0 . 8 Y x Fe 2 − x O 4 is verified by EDS. The average size of the nanoferrites is around 80 nm, which is examined by TEM image. Y 3 + substituted Mg-Mn nanoferrites exhibit low saturation magnetization ( M s ) and coercivity ( H c ) . Especially, the nanoferrites with x = 0 . 0 7 5 show the lowest M s and H c of 46.96 emu/g and 12.04 Oe, respectively. The ferrite composites present that the resistivity and the magnetic loss are less than 4 . 5 × 1 0 7 Ω ⋅ cm and 0.7 in the range of 2–18 GHz, respectively. The low coercivity and high resistivity indicate that the addition of Y 3 + contributes to the synthesis of the excellent soft magnetic materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 8
·2760-2768
·
IF 2.787
Xue Mao,Ying Bai,Jianyong Yu,Bin Ding
Polynanocrystalline yttria-stabilized zirconia (YSZ) nanofibrous membranes with robust flexibility and heat resistant were fabricated by a combination of electrospinning and heat-treatment process. The morphology and crystallographic structure of YSZ nanofibrous membranes were revealed and regulated by varying polymer composition in precursor solutions, which resulting in an effective control of mechanical properties from brittleness to robust tensile strength of 5.04 MPa. In addition, the relationship between the precursor composition and grain size is deeply discussed during the calcination process. Meanwhile, an inverse Hall–Petch effect of nanocrystalline materials was displayed on the YSZ nanofibrous membranes, due to the abundantly existence of ribbons. Furthermore, the flexible YSZ nanofibrous membranes with excellent bending resistance of 400 times and heat resistance of 1473 K exhibit high filtration efficiency of 99.996% for NaCl particles in the size range 300–500 nm, which suggested them to be promising candidate for high-temperature filtration fields including metallurgy, steel, electric power, incineration, cement industries, etc.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Ming-Ye Yang,Jun-Wei Wang,Lin Li,Bin-Bin Dong,Xu Xin,Simeon Agathopoulos
This paper reports on the successful fabrication of γ-Y 2 Si 2 O 7 membranes with low thermal conductivity , which is an important membrane property for achieving high performance in membrane distillation process. Single-phase γ-Y 2 Si 2 O 7 powder was first synthesized by calcination of SiO 2 and Y 2 O 3 powders, with 3 wt% LiYO 2 as a sintering aid. The membrane was produced by tape-casting of a suspension of this powder. After sintering at 1300 °C for 4 h, a flat membrane was obtained, which had a thickness of 0.5 mm, 49% porosity, 0.9 μm pore diameter, and low thermal conductivity of 0.497 W/m⋅K at 32 °C, and 0.528 W/m⋅K at 100 °C. The obtained membrane presented hydrophobic features (water contact angle was 132°) after surface modification, which resulted in formation of a strongly adhered robust hydrophobic SiNCO nanoparticle layer on its surface. The resultant hydrophobic membrane was tested in water desalination experiments using a sweeping gas membrane distillation (SGMD) device. High water flux of 10.07 L⋅ m −2 ⋅ h −1 was achieved for a 20 wt% NaCl feeding solution and a temperature at the feed of 90 °C. Stable water flux and rejection rates were recorded in long-term experiments (>400 h).
研究领域:
材料科学
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膜技术
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Jun Chen,Shuang Zhao,Zhiyu Zhao,Min Liao,Shengbiao Pan,Junqin Feng,Daoyun Zhu,Wei Pang,Jiayu Lin,Zhongfei Mu
The development of phosphor-converted white light-emitting diodes (w-LEDs) is in the ascendant. However, it is a constant pursuit to find the most suitable visible light emitting phosphors. Trivalent Bi ion is a kind of activator ion with a wide range of luminescence (from ultraviolet to visible). It has important application value for the study of luminescent properties of Bi 3+ activated phosphors. The luminescent properties of blue-green-emitting Sr 2 YNbO 6 : x Bi 3+ phosphors were studied in this work. The phosphors can emit blue to blue-green light under near ultraviolet excitation from 329 to 374 nm. It is particularly important that the luminescence color can be adjusted by using different excitation wavelengths. This greatly enhances the flexibility of materials in lighting and display applications. The luminescence intensity (λ ex = 329 nm) at 498 K can still maintain 61.28% of that at 298 K. It indicates that the phosphors also have suitable luminescent thermal stability. All the results show that Bi 3+ doped Sr 2 YNbO 6 is a kind of luminescent material with potential application value in the field of w-LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 5
·3382-3390
·
IF 4.186
Chengrui Liu,Juan Jiang,Guohong Zhou,Tianjin Zhang,Song Hu,Lin Gan,Xianpeng Qin
Highly transparent cerium-doped yttria ceramics were fabricated via a pressureless sintering method with an addition of 10 at.% La 2 O 3 and 1 at.% ZrO 2 as a binary sintering additive. With an increase in the Ce doping concentration from 0 to 3 at.%, the optical absorption edge of yttria ceramics exhibited a significant red shift from 290 to 380 nm as a result of the 4f–5d transition of Ce 3+ and the charge transfer of Ce 4+ (i.e., Ce 4+ +e – →Ce 3+ ). For a 2-mm thick sample doped with 3 at.% Ce, the total ultraviolet radiation (UV) transmittance (220–400 nm) is only 1.7%, indicating a nearly complete UV absorption. Meanwhile, the specimens possess high in-line transmittance levels in both the visible and the infrared regions (i.e., >70% at 450 nm and ∼80% at 1100 nm). Additionally, the present specimens were confirmed to have good enough mechanical strength levels (∼165 MPa) and thermal conductivity (∼5 W/m·K), which are comparable or even better compared to those of previously reported transparent yttria ceramics. The results of this work indicate that cerium-doped transparent yttria ceramics are promising candidate materials for full-band UV-shielding window applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Ya-Zhe Xing,Yin-Ni Men,Xiao Feng,Ji-Hua Geng,Zhi-Rui Zou,Fu-Hua Chen
The effect of CuO addition on the microstructure and ionic conductivity of 8 mol% yttria-stabilized zirconia (8YSZ) were investigated. Undoped and 1 mol%, 1.5 mol%, 2 mol%, 2.5 mol% and 3 mol% CuO-doped 8YSZ bulks were prepared by sol-gel synthesis, cold pressing forming, and high-temperature sintering. The microstructure, phase composition , and ionic conductivity of the samples were characterized in detail to determine whether it could be used as alternative electrolyte material for the intermediate and low temperature solid oxide fuel cells. The results reveal that all samples present cubic zirconia. With increasing the CuO-doping content, the lattice parameter of the samples decreases, while the relative density of the samples increases from 66 to 85%, and the mean grain size increases from 0.90 to 2.63 μm. Furthermore, it is found that 2 mol% CuO doped 8YSZ possesses the minimum activation energy of 0.945 eV and the maximum AC ionic conductivity of 5.75 × 10 −2 S·cm −1 measured at 750 °C. The change in the ionic conductivity with the CuO-doping content is closely related to microstructural evolution and defect association in the materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Additive Manufacturing
·
2023
·
IF 11
Aiping Lin,Yang Zhang,Danjiao Zhao,Yu Wu,Shufen Wang,Jianmin Li,Lanlan Fan,Shixian Xiong,Lei Cao,Feng Gu
Flexible techniques for producing luminescent patterns with high-resolution and moderate efficiency at the microscale are potentially important for pattern display, customized anti-counterfeiting and data security. An innovative droplet-based aerosol jet printing procedure has been developed for the creation of prominently luminescent patterns of europium-doped yttrium oxide (Y 2 O 3 :Eu 3+ ) inorganic phosphors in case of a rather low calcining temperature. Microscale luminescent patterns of pomegranate-shaped Y 2 O 3 :Eu 3+ nanospheres were effectively created by synchronizing the droplet deposition behavior and the microreactions therein. The deposition temperature was crucial to the pattern development accompanying a morphological transformation from dense film to spherical nanostructures by providing an anisotropic evaporation regime. The red emission of the printed luminescent patterns was nearly identical to that of the equivalents calcined at 1000 °C, indicating the possibility for future applications in flat panel display systems.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 9
·1-10
·
IF 2.8
Wu Hao,Li Jie,Han Xuening,Li Wei,Sun Kai,Chen Yixin,Yan Yang,Chen Daming
In-substituted YIG ferrite (Y 3 Fe 5 − x In x O 12 ) materials were prepared by citrate nitrate sol–gel method. Phase formation, microstructure, and magnetic properties were investigated, and the effects of In-substitution were discussed detailed. X-ray diffraction results showed the In-substitution did not change the phase formation of YIG ferrite, but cause the lattice constants change slowly. Scanning electron microscopy showed the materials prepared by sol-gel method had small gain size, and In 3+ enhanced grain growth. The high-substituted content had pores among grain boundaries, which was an influence factor on magnetic property. With In-substituted increase, saturation magnetization ( σ ) increased from 21.77emu/g ( x = 0.0) to 26.94 emu/g (4π M S =1639.2 Gs) when x = 0.4, and then decreased to 20.27 emu/g (4π M S =1230.0 Gs, x = 0.5). Meanwhile, the coercivity ( H C ) decreased from 12.3 Oe to 12.1 Oe ( x = 0.3) and then increased to 13.6 Oe ( x = 0.5). For ferromagnetic resonance (FMR) linewidth (Δ H ), the narrow FMR value was Δ H = 62.82 Oe at x = 0.4. The anisotropy linewidth Δ H a and porosity linewidth Δ H p were mainly influence factors on linewidth of materials, and the magnetism was discussed detailed. The narrow FMR linewidth and high saturation magnetization suggested the possible use of these materials in high-frequency microwave applications.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 29
·73534-73547
·
IF 5.8
Lin Sudan,Xu Yongzhi,Fu Chen,Zhang Haifeng,Kong Qiaoping,He Haoran,Liu Siyuan,Shi Xueqing,Zhao Dandan
Recently, selective phosphorus removal from aqueous solution has been a highly desirable strategy to combat eutrophication due to the increasingly stringent phosphorous emission standards. However, conventional adsorbents pose the limitations in phosphate removal suffering from lack of selectivity and stability under complicated condition and poor separation. In this study, novel Y 2 O 3 based calcium-alginate (Y 2 O 3 /SA) beads of feasible stability and highly selectivity towards phosphate by encapsulating Y 2 O 3 nanoparticles inside calcium-alginate beads via Ca 2+ controlled gelation process was synthesized and characterized. The phosphate adsorption performance and mechanism were investigated. In general, a high selectivity among co-existing anions was found with co-existing anion concentration up to 62.5 times of the phosphate concentration. Additionally, phosphate adsorption by Y 2 O 3 /SA beads exhibited stable performance over a wide pH range between 2 and 10, while reaching the maximum adsorption capacity at pH 3 (48.54 mg-P/g). The value of point of zero charge (pH pzc ) of Y 2 O 3 /SA beads was approximately 3.45. Pseudo-second-order and Freundlich isotherm models can well accord with kinetics and isotherms data. The FTIR and XPS characterizations analyzed that inner-sphere complexes were proposed to be the major contributor of Y 2 O 3 /SA beads for phosphate removal. In conclusion, Y 2 O 3 /SA beads as the mesoporous material exhibited excellent stability and selectivity towards phosphate removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yuwei Liu,Jingbo Jia,Hongli Zheng,Changfu You,Haiming Wang
Ni-based catalysts derived from Ni-Al-Y layered double hydroxides with various amounts of yttrium were synthesized by a condensation reflux method. At the optimized Al/Y atomic ratio of 24/1, the obtained H-Ni 75 Al 24 Y 1 sample showed the highest CO 2 methanation performance. At a WHSV of 15,000 mL h -1 g -1 and a pressure of 0.1 MPa, the CO 2 conversion reached 84.1% with 100% selectivity to CH 4 at 250°C, which was much higher than that of H-Ni 75 Al 25 (75.7%) prepared by the hydrothermal method. Furthermore, the CO 2 conversion over H-Ni 75 Al 24 Y 1 sample rose to 88.7% at 300°C, which exceeded that of the Y-free counterpart (84.1%). The introduction of Y altered the amount and distribution of basic sites as revealed by CO 2 -TPD and led to smaller size and higher dispersion of Ni as proved by XRD, TEM and XPS. The H 2 -TPR result verified stronger metal-support interaction but higher amount of reducible Ni weakly interacted with the support in Ni 75 Al 24 Y 1 LDH sample compared with the Y-free counterpart. As a result, the dissociation of H 2 over Ni sites and subsequent hydrogenation became faster based on the in situ DRIFTS results. Dual pathways were proposed to illustrate the reaction mechanism of CO 2 methanation.
研究领域:
催化
·
环境化学
·
材料科学
·
化学工程
·
纳米技术
✓ 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）