JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2016
·Vol. 127
·期 3
·1889-1895
·
IF 1.781
Yuan Kangkang,Gan Xinzhu,Wang Xinqiang,Zhu Luyi,Zhang Guanghui,Xu Dong
The present study fully reports the decomposition of polyacetylacetonatozirconium (PAZ) in air with thermogravimetry–differential scanning calorimetry and Fourier transform infrared spectroscopy. The influence of water vapor on the decomposition of PAZ was characterized with the Fourier transform infrared spectroscopy. Crystallization and phase transformation of PAZ were studied by X-ray diffraction and Raman spectroscopy. The experimental results show that water vapor promotes the decomposition of PAZ and crystallization of zirconia compared with air. Furthermore, the effect of different amount of stabilizer Y(NO 3 ) 3 ·6H 2 O on the pyrolysis and phase stabilization of PAZ shows that NO 3
− was beneficial to the oxidation of organic components and the formation of Y 2 O 3 could stabilize tetragonal zirconia and hinder grain growth.
研究领域:
材料化学
·
无机化学
·
纳米材料
·
热分析
·
光谱学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Yueying Li,Yan Ma,Wenyuan liu,Zhoufu Wang,Hao Liu,Xitang Wang,Hengyong Wei,Shenghao Zeng,Nian Yi,Gary J. Cheng
The colored non-toxic near-infrared (NIR) reflective and infrared radiative pigments are desired in reducing the energy consumption of buildings. In this work, yttrium ferrite (YFeO 3 ) pigments with controllable crystalline structure were successfully synthesized via the method of solid-state reaction at low-heating temperature. The effects of the crystalline structure and microstructure, especially charge state distribution, on the bandgap, chromatic properties, infrared reflection and radiation performance of YFeO 3 pigments were investigated for the first time. With the calcining temperature increased, the structure of obtained pigments changed from hexagonal to orthorhombic, and the bandgap was obviously widened. The black hexagonal YFeO 3 pigments possessed small particle size, and their intensive optical absorption in the NIR range was related to the noticeable multiple reflections induced by the grain boundary. While, the brown orthorhombic YFeO 3 powdered pigments, as well as the corresponding pigmented coatings, possessed good NIR reflection characteristics, and the high solar reflectance values clearly highlight the potential of these pigments as cool pigments. In addition, the obtained YFeO 3 pigmented coatings showed high emissivity in 8–14 μm waveband (atmospheric window), indicating their potential applications in energy saving of buildings by combining NIR shielding and space cooling. The larger amount of Fe 2+ -Fe 3+ ions pairs in the orthorhombic pigments led to the enhancement of free carrier absorption, which enhanced infrared emission and contributed to the slightly decreased NIR reflectance.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2025
·Vol. 66
·期 4
·575-581
·
IF 1.1
Jianrong Hang,Zheng Jiajia,Yu Juan,Huang Pei,Wang Xiaodong
Polyimide exhibits high optical transparency, exceptional thermal properties, robust mechanical characteristics, and dimensional stability. However, conventional polyimides typically do not possess luminescent properties, which significantly restricts their applicability in the domain of optoelectronic devices. A viable approach to address this limitation involves the incorporation of fluorescent powders into polyimide films, thereby ensuring that the films maintain their practical utility while also exhibiting certain fluorescent properties. In this study, we synthesized yttrium oxide (Y 2 O 3 ), which possesses fluorescence characteristics, and incorporated it into polyimide films. The introduction of Y 2 O 3 not only imparts fluorescence to the films but also enhances their thermal stability while preserving their mechanical integrity. The glass transition temperature of the modified films is approximately 300°C, and the tensile strength exceeds 85 MPa, surpassing the industry application standards.
研究领域:
材料科学
·
光电子学
·
高分子科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2014
·Vol. 115
·期 4
·
IF 2.185
Wang Pei,He Duanwei,Xu Chao,Ren Xiangting,Lei Li,Wang Shanmin,Peng Fang,Yan Xiaozhi,Liu Dongqiong,Wang Qiming,Xiong Lun,Liu Jing
Angle-dispersive synchrotron X-ray diffraction measurements were performed on vaterite-type YBO 3 /Eu 3+ , GdBO 3 , and EuBO 3 , respectively, up to 41 GPa at room temperature using a diamond-anvil cell. Pressure-induced amorphization was observed in hexagonal GdBO 3 with a significant compression along the c -axis. Compared to the ions of the distorted GdBO 3 phase, its anions may lose their long-range order prior to the cations at high pressures. Based on the experimental pressure-volume data, the obtained bulk moduli of YBO 3 /Eu 3+ and GdBO 3 are 329 and 321 GPa, respectively, which are more than 90% larger than that of EuBO 3 (167 GPa) and are presumably attributed to Gd 3+ and Y 3+ with a high density of d valence electrons.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2014
·Vol. 17
·期 1
·21-27
·
IF 1.508
Kuo Jiang,Songbai Liu
Graphical Metastable tetragonal (t′) ZrO 2 stabilized with 4 mol% Yb 2 O 3 sinters more slowly and has a higher resistance to destabilization than YSZ with the same composition (4 mol% Y 2 O 3 ). The improved phase stability is attributed to the slower diffusion of the smaller Yb 3+ ion in t′ phase compared to the larger Y 3+ ion. In addition, the TEC of 4 mol% Yb 2 O 3 -stabilized ZrO 2 is also found to be superior to that of YSZ, suggesting practical possibility for thermal barrier coatings.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 100
·57048-57053
·
IF 3.708
Hong Liu,Ping Liu,Xiangming Su,Jie Liu,Xiaoqing Li,Hongde Luo,Zhiling Yao,Xibin Yu,Ming Zhan
Highly crystallized micro/nano-sized Y2O2S and RE (Eu3+, Yb3+/Er3+) doped samples were prepared through a one-pot mild (200–250 °C) solvothermal method. By simply adjusting the amount of initial sulfur powder, the morphology and assembled nano-structures could be well controlled. With varying concentration of sulfur powder from 0.08 M to 0.8 M, the morphology and size of the target products varied from 20 nm nanosheets, 2 μm sheet-assembled plates/flowers to 1.5 μm nano-assembled spheres. The luminescence properties of Eu3+ doped Y2O2S with different morphologies were studied. The excitation peak above 300 nm ascribed to S2−–Eu3+ charge transfer showed a blue shift of 9 nm compared with the bulk sample. When co-doped with Yb3+/Er3+, the Y2O2S:Yb3+, Er3+ nano-aggregates exhibited a tunable emission under 980 nm laser excitation, shifting from greenish-yellow to orange-yellow, with increasing Yb3+/Er3+ ratio.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2014
·
IF 2.075
Lina Liu,Surong Yue,Yongsheng Zhang,Ruifei Qin,Lishuang Liu,Dongmei Zhang,Ruirui Sun,Linfeng Chen
Core–shell structured YVO 4 :Eu 3+ @SiO 2 nanocomposite particles were synthesized using a one-pot reverse microemulsion method and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV absorption spectra , and photoluminescent spectra. The nanocomposite particles are well-dispersed and about 20 nm in average size. The synthesis method is of one-pot, simplifying the preparation of this kind of core–shell structured nanocomposites. The formation process of these nanocomposite particles is suggested and the photoluminescence properties of them are studied and compared with those of uncoated YVO 4 :Eu 3+ sample.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Dianguang Liu,Yan Gao,Jinling Liu,Yiguang Wang,Linan An
A mixture of pure monolithic ZrO 2 and Y 2 O 3 powders was flash-sintered at different holding times. The results show that flash-sintering led to a rapid phase transformation: The starting monolithic ZrO 2 completely transformed to tetragonal phase after the flash-sintering for as short as 10 s. Although dense samples with relatively uniform microstructures were obtained at a holding time of longer than 5 min, the holding time had no significant effect on grain size. Both the bulk and intrinsic grain-boundary conductivity increased with an increase in the holding time, indicating that flash-sintering created oxygen vacancies in both grains and grain boundaries that accumulated with an increase in the holding time.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 4
·867-875
·
IF 1.385
Guo Xingzhong,Song Jie,Ren Jing,Yang Fanger,Kanamori Kazuyoshi,Nakanishi Kazuki
Yttria-stabilized zirconia monoliths with well-defined macropores and high porosity have been successfully fabricated via sol–gel process accompanied by phase separation. Propylene oxide acts as an acid consumer to mediate sol–gel process, and poly (ethylene oxide) is used to induce phase separation. Ethylene glycol is applied as chelating agent, and formamide serves as drying control chemical additive to inhibit cracking during drying stage. Proper proportion of the starting compositions allows the generation of well-defined macroporous YSZ monoliths with co-continuous skeletons and porosity as high as more than 60 %. The dried gels are amorphous and crystalline of ZrO 2 precipitates after heat treatment between 400 and 1200 °C without formation of monoclinic ZrO 2 , which indicating a wide application prospects.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Qianqian Chen,Panpan Lin,Xuanyu Du,Hiroyuki Inoue,Kazuro Kizaki,Tiesong Lin,Peng He
A new low-temperature magnetic Bi 2 O 3 -CoO-Fe 2 O 3 -B 2 O 3 (BCFB) glass was designed to acquire magnetic yttrium iron garnet (YIG/YIG) joint. This paper investigated the thermal behavior of BCFB glass and its wettability on YIG. The microstructural evolution, mechanical and electromagnetic properties of YIG/YIG joint were systematically studied. CoFe 2 O 4 nuclei were gradually formed, growing up into nano-scale CoFe 2 O 4 crystals in the glass seam. Meanwhile, some CoFe 2 O 4 crystals grew up excessively by swallowing nano CoFe 2 O 4 , reaching microns. YBO 3 reaction layer was formed and grew into YBO 3 whiskers at the interface of YIG/glass with the brazing temperature increasing. The joint shear strength increased, reaching a maximum of 85.2 MPa at 775 °C under the collaborative reinforcement of well-integrated interface and glass-ceramic seam, then declined due to the aggravative reaction. The dielectric constant of YIG/YIG joints decreased with the brazing temperature increasing, varying from 18.5 to 16.6 at the frequency of 10 MHz. AFM/MFM and VSM analyses indicate that the glass seam performed magnetic property. The saturation magnetization of BCFB glass reached about 4.2 emu/g and 5.0 emu/g heat-treated at 750 °C and 775 °C, respectively, which could effectively enhance the magnetism of the glass seam.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 15
·4871-4883
·
IF 6.177
Yu Zhang,Zhoujie Liang,Guojie Zhang,Jun Liu,Ying Wang,Yuqing Zhao,Guoqiang Li,Yongkang Lv
Greenhouse effect has become one of the serious issues in the human development. Greenhouse gases are mainly composed of methane and carbon dioxide. Dry methane reforming (DMR) is an excellent technology owing to the direct utilization of greenhouse gases. However, there are severe catalyst sintering and coke deposits in the process of DMR. Therefore, it is necessary to synthesize catalysts with fantastic properties. Here, a series of cobalt catalysts modified by different transition metals (Y, Gd, and Mn) were synthesized applying the impregnation method. The Y-modified catalyst shows excellent catalytic activity and anti-coking ability. Under the reaction condition of 800 °C, the catalyst exhibits not only the highest CH4 conversion (83%) but also stable CO2 conversion (94%) after 10 h of reaction. N2 physisorption, TG, H2-TPR, XPS, XRD and TEM were applied to research the crystal phase, microstructure and texture characteristics of the catalysts. The results show that the Mn-modified catalyst exhibited a negative influence for the DMR reaction although the catalyst shows a large specific surface area. Gd- and Y-modified catalysts exhibited superior interaction between the metal and carrier, which improves the stability of active metal Co during DMR. Simultaneously, the introduction of Y maintains more number of oxygen vacancies and improves the dispersion of the active metal. The study found that both the activity and coke resistance of the catalyst can be concurrently enhanced due to the addition of Y through promoting the dispersion of the metal and the activation of CO2. Most noteworthily, after a 50 h stability test, the CH4 and CO2 conversion on the Y-modified catalyst dropped from 91% and 95% to 83% and 94%, respectively.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hao Chen,Hao Deng,Wenhao Liu,Hanyang Zuo,Lvjun Zhou,Wenbin Qiu,Yongqiang Wei,Zuxi Xia,Huaqiao Peng,Jun Tang
Obtaining higher mechanical properties , particularly the coexistence of strength and ductility, is always an important issue for high-strength and high-ductile metastable β titanium alloy , such as Ti55531. Rare earth element doping to gain reticulate structure is a possible way to break the strength-ductility trade-off considering the excellent capability of yttrium in improving the properties of titanium alloys and limiting grain growth. In this study, a new strategy was devised for the preparation of Ti55531 alloys with a reticulate structure by introducing yttrium and a tailored spark plasma sintering (SPS) procedure. Compared to the homogeneous structure, the strength of the material with a reticulate structure is prominently improved at the little expense of loss in ductility. Furthermore, the addition of yttrium can significantly increase the precipitation of α phase by affecting the local element concentration. It is hoped that this study can provide important inspiration for improving the mechanical properties of powder metallurgy fabricated titanium alloys.
研究领域:
材料科学
·
冶金工程
✓ 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）