The Experts below are selected from a list of 1074 Experts worldwide ranked by ideXlab platform
Xuanyi Yuan - One of the best experts on this subject based on the ideXlab platform.
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Studies on Highly Dense Pure YIG Polycrystalline Ceramics Fabricated by Tape-Casting Method
2020Co-Authors: Chong Zhao, Xiaofei Shen, Zhijun Cao, Zhiquan Cao, Zicheng Wen, Xuanyi Yuan, Yongge CaoAbstract:Abstract Pure phase Y3Fe5O12 (YIG) ceramics was successfully produced by Tape-Casting forming process and one-step solid-state reaction Method. With the sintering temperature above 1100 ºC, the pure phase YIG ceramics was synthesized with no YIP or Fe2O3 phase in XRD patterns. YIG ceramic sintering at 1400 ºC for 10 h showed a clear grain structure with an obvious grain boundary, and no pores were observed in the SEM images. YIG ceramics in this paper has a high relative density which was 99.8% and the saturation magnetization was 28.2 emu/g at room temperature. The hysteresis loss at temperatures of 230-360 K was smaller than 10 mJ/kg. The tan Se was nearly zero at 6~7 GHz and 11~12 GHz, showing that it can be used as a good material for microwave applications. In addition, the low values of tan and tan indicates that it may have a good electromagnetic wave absorption ability.
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Longitudinally diode-pumped planar waveguide YAG/Yb:LuAG/YAG ceramic laser at 1030.7 nm.
Optics Letters, 2016Co-Authors: Jiangfeng Zhu, Zicheng Wen, Xuanyi Yuan, Kai Liu, Fei Tang, Jiaqi Long, Wang GuoAbstract:Composite YAG/15 at. % Yb:LuAG/YAG transparent ceramic planar waveguide was fabricated by a Tape Casting Method and vacuum sintering technology. Under a 970 nm diode laser pumping, the absorbed efficiency of 85.4% was achieved, and efficient CW laser operation at 1030.7 nm was accomplished with a good beam quality with Gaussian spatial profile. A maximum output power of 288 mW was obtained under a pump power of 4.69 W, corresponding to a slope efficiency of 9% and an O-O conversion efficiency of 5%.
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fabrication and planar waveguide laser behavior of yag nd yag yag composite ceramics by Tape Casting
Journal of Alloys and Compounds, 2015Co-Authors: Fei Tang, Weidong Chen, Ge Zhang, Wenchao Wang, Xuanyi YuanAbstract:Abstract Planar waveguide laser output was successfully demonstrated on Nd:YAG sandwich composite ceramics. Tape Casting Method combined with vacuum sintering technology was used to fabricate this sample. The core layer was 0.1 mm thickness with Nd doping concentration of 2 at.%. Clean morphology of microstructure was observed with average grain size of 10 μm. The sample exhibited high optical transmittance of above 80% at the wavelength of 632 nm. With the quasi-monolithic Fabry–Perot cavity configuration, the maximum slope efficiency of 63% was achieved in continuous wave (C.W.) operation mode, with a maximum output power of 840 mW and threshold absorbed pump power of about 0.16 W.
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Fabrication and planar waveguide laser behavior of YAG/Nd:YAG/YAG composite ceramics by Tape Casting
Journal of Alloys and Compounds, 2015Co-Authors: Fei Tang, Xuanyi Yuan, Yongge Cao, Weidong Chen, Ge Zhang, Wenchao Wang, Haifeng Lin, Zhen DaiAbstract:Abstract Planar waveguide laser output was successfully demonstrated on Nd:YAG sandwich composite ceramics. Tape Casting Method combined with vacuum sintering technology was used to fabricate this sample. The core layer was 0.1 mm thickness with Nd doping concentration of 2 at.%. Clean morphology of microstructure was observed with average grain size of 10 μm. The sample exhibited high optical transmittance of above 80% at the wavelength of 632 nm. With the quasi-monolithic Fabry–Perot cavity configuration, the maximum slope efficiency of 63% was achieved in continuous wave (C.W.) operation mode, with a maximum output power of 840 mW and threshold absorbed pump power of about 0.16 W.
Hugh Robertson - One of the best experts on this subject based on the ideXlab platform.
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Pyrolysis of poly-methyl methacrylate (PMMA) binder in thermoelectric green Tapes made by the Tape Casting Method
Journal of the European Ceramic Society, 2000Co-Authors: Loey A. Salam, Richard D. Matthews, Hugh RobertsonAbstract:Abstract The pyrolysis of poly-methyl methacrylate (PMMA) binder in thermoelectric green Tapes, are analysed through differential thermal analysis (DTA), thermogravimetric analysis (TGA). These analyses confirmed that the main mechanism of the PMMA binder decomposition is the depolymerization or the unzipping mechanism. The best pyrolysis procedure was found to be in air to a maximum temperature of 410°C with 1.30–2 h hold out time. Some small amount of binder residue was found to remain in Tapes after the pyrolysis procedure. This was suspected to be due to an interaction between the thermoelectric powder and the PMMA binder. Despite this small residue, the thermoelectric Tape was sintered successfully to almost 95% of its theoretical density, in vacuum at 1200°C after 4 h.
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Optimisation of thermoelectric green Tape characteristics made by the Tape Casting Method
Materials Chemistry and Physics, 2000Co-Authors: Loey A. Salam, Richard D. Matthews, Hugh RobertsonAbstract:The variables of the Tape Casting process were optimised to produce green Tapes made out of thermoelectric material powders, with sufficient strength to be handled during the post-processing stage. Most of the mechanisms and analysis concerning the organic additions to the powder, to create a flexible green Tape, have been explored. The types of organic additives used in the formulation of the slurry, the effect of the ratio of the organic additives on the final physical characteristics of the green Tapes are given. The manufacture of Tapes characterised by the powder size, slurry viscosity, apparent and bulk densities, tensile strength, and adhesion properties is outlined. All these parameters were optimised for the specific task of fabricating a thermoelectric generator, as a monolithic block, made out of multi-layers of different materials.
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Fabrication of iron disilicide (FeSi2) thermoelectric generator by the Tape Casting Method
Materials & Design, 1999Co-Authors: Loey A. Salam, Richard D. Matthews, Hugh RobertsonAbstract:Abstract The Tape Casting process has been applied to fabricate a thermoelectric generator consisting of a multi-layers of semiconducting FeSi 2 and insulating ceramic material layers. The production process of the thermoelectric generator is described in terms of powder production, green Tapes manufacturing and lamination, pyrolysis, sintering and the annealing procedures for the laminated structure. A selection of some ceramic alloys which matched the required criteria to be used with the FeSi 2 semiconductor is also described. The performance of a thermoelectric generator made by the Tape Casting Method, is compared to those made by conventional fabrication techniques.
Fei Tang - One of the best experts on this subject based on the ideXlab platform.
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Longitudinally diode-pumped planar waveguide YAG/Yb:LuAG/YAG ceramic laser at 1030.7 nm.
Optics Letters, 2016Co-Authors: Jiangfeng Zhu, Zicheng Wen, Xuanyi Yuan, Kai Liu, Fei Tang, Jiaqi Long, Wang GuoAbstract:Composite YAG/15 at. % Yb:LuAG/YAG transparent ceramic planar waveguide was fabricated by a Tape Casting Method and vacuum sintering technology. Under a 970 nm diode laser pumping, the absorbed efficiency of 85.4% was achieved, and efficient CW laser operation at 1030.7 nm was accomplished with a good beam quality with Gaussian spatial profile. A maximum output power of 288 mW was obtained under a pump power of 4.69 W, corresponding to a slope efficiency of 9% and an O-O conversion efficiency of 5%.
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fabrication and planar waveguide laser behavior of yag nd yag yag composite ceramics by Tape Casting
Journal of Alloys and Compounds, 2015Co-Authors: Fei Tang, Weidong Chen, Ge Zhang, Wenchao Wang, Xuanyi YuanAbstract:Abstract Planar waveguide laser output was successfully demonstrated on Nd:YAG sandwich composite ceramics. Tape Casting Method combined with vacuum sintering technology was used to fabricate this sample. The core layer was 0.1 mm thickness with Nd doping concentration of 2 at.%. Clean morphology of microstructure was observed with average grain size of 10 μm. The sample exhibited high optical transmittance of above 80% at the wavelength of 632 nm. With the quasi-monolithic Fabry–Perot cavity configuration, the maximum slope efficiency of 63% was achieved in continuous wave (C.W.) operation mode, with a maximum output power of 840 mW and threshold absorbed pump power of about 0.16 W.
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Fabrication and planar waveguide laser behavior of YAG/Nd:YAG/YAG composite ceramics by Tape Casting
Journal of Alloys and Compounds, 2015Co-Authors: Fei Tang, Xuanyi Yuan, Yongge Cao, Weidong Chen, Ge Zhang, Wenchao Wang, Haifeng Lin, Zhen DaiAbstract:Abstract Planar waveguide laser output was successfully demonstrated on Nd:YAG sandwich composite ceramics. Tape Casting Method combined with vacuum sintering technology was used to fabricate this sample. The core layer was 0.1 mm thickness with Nd doping concentration of 2 at.%. Clean morphology of microstructure was observed with average grain size of 10 μm. The sample exhibited high optical transmittance of above 80% at the wavelength of 632 nm. With the quasi-monolithic Fabry–Perot cavity configuration, the maximum slope efficiency of 63% was achieved in continuous wave (C.W.) operation mode, with a maximum output power of 840 mW and threshold absorbed pump power of about 0.16 W.
Xihong Hao - One of the best experts on this subject based on the ideXlab platform.
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Ultra-high energy-storage density and fast discharge speed of (Pb0.98−xLa0.02Srx)(Zr0.9Sn0.1)0.995O3 antiferroelectric ceramics prepared via the Tape-Casting Method
Journal of Materials Chemistry A, 2019Co-Authors: Xiaohui Liu, Xihong HaoAbstract:Inspired by the increasing demand for high energy-storage capacitors in electronic and electrical systems, the development of dielectrics with high energy-storage performance has attracted much attention recently. Here, a record-high recoverable energy-storage density of 11.18 J cm−3 and a high energy efficiency of 82.2% are realized in (Pb0.98–xLa0.02Srx)(Zr0.9Sn0.1)0.995O3 (PLSZS) antiferroelectric ceramics prepared using the Tape-Casting Method. Sr2+-doping and the Tape-Casting Method give rise to a colossal increase in breakdown strength and switching of the electric field between the antiferroelectric and ferroelectric phase, which are responsible for the excellent energy-storage properties. Furthermore, with respect to the discharge performance, the antiferroelectric PLSZS ceramics exhibit a high discharge energy density of 8.6 J cm−3, and fast discharge speed where 90% of the stored energy could be released in 185 ns. This study opens up a promising and feasible route for designing high energy-storage materials via an appropriate element doping and fabricating Method, and more importantly, gives PLSZS antiferroelectric ceramics an unexpected role with potential for application in high-power pulsed capacitors.
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Ultra-high energy-storage density and fast discharge speed of (Pb₀.₉₈₋ₓLa₀.₀₂Srₓ)(Zr₀.₉Sn₀.₁)₀.₉₉₅O₃ antiferroelectric ceramics prepared via the Tape-Casting Method
Journal of Materials Chemistry, 2019Co-Authors: Xiaohui Liu, Xihong HaoAbstract:Inspired by the increasing demand for high energy-storage capacitors in electronic and electrical systems, the development of dielectrics with high energy-storage performance has attracted much attention recently. Here, a record-high recoverable energy-storage density of 11.18 J cm⁻³ and a high energy efficiency of 82.2% are realized in (Pb₀.₉₈–ₓLa₀.₀₂Srₓ)(Zr₀.₉Sn₀.₁)₀.₉₉₅O₃ (PLSZS) antiferroelectric ceramics prepared using the Tape-Casting Method. Sr²⁺-doping and the Tape-Casting Method give rise to a colossal increase in breakdown strength and switching of the electric field between the antiferroelectric and ferroelectric phase, which are responsible for the excellent energy-storage properties. Furthermore, with respect to the discharge performance, the antiferroelectric PLSZS ceramics exhibit a high discharge energy density of 8.6 J cm⁻³, and fast discharge speed where 90% of the stored energy could be released in 185 ns. This study opens up a promising and feasible route for designing high energy-storage materials via an appropriate element doping and fabricating Method, and more importantly, gives PLSZS antiferroelectric ceramics an unexpected role with potential for application in high-power pulsed capacitors.
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ultra high energy storage density and fast discharge speed of pb ₓla srₓ zr sn o antiferroelectric ceramics prepared via the Tape Casting Method
Journal of Materials Chemistry, 2019Co-Authors: Xiaohui Liu, Xihong HaoAbstract:Inspired by the increasing demand for high energy-storage capacitors in electronic and electrical systems, the development of dielectrics with high energy-storage performance has attracted much attention recently. Here, a record-high recoverable energy-storage density of 11.18 J cm⁻³ and a high energy efficiency of 82.2% are realized in (Pb₀.₉₈–ₓLa₀.₀₂Srₓ)(Zr₀.₉Sn₀.₁)₀.₉₉₅O₃ (PLSZS) antiferroelectric ceramics prepared using the Tape-Casting Method. Sr²⁺-doping and the Tape-Casting Method give rise to a colossal increase in breakdown strength and switching of the electric field between the antiferroelectric and ferroelectric phase, which are responsible for the excellent energy-storage properties. Furthermore, with respect to the discharge performance, the antiferroelectric PLSZS ceramics exhibit a high discharge energy density of 8.6 J cm⁻³, and fast discharge speed where 90% of the stored energy could be released in 185 ns. This study opens up a promising and feasible route for designing high energy-storage materials via an appropriate element doping and fabricating Method, and more importantly, gives PLSZS antiferroelectric ceramics an unexpected role with potential for application in high-power pulsed capacitors.
Chusheng Chen - One of the best experts on this subject based on the ideXlab platform.
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A 3D Cu current collector with a biporous structure derived by a phase inversion Tape Casting Method for stable Li metal anodes
Journal of Materials Chemistry A, 2019Co-Authors: Li-min Wang, Chusheng Chen, Zhong-feng Tang, Jie Lin, Chunhua ChenAbstract:Li metal has been considered to be the optimal anode material for the next generation high-density batteries due to its very high specific capacity and lowest electrochemical potential. However, various challenges, such as dendrite growth, volume change and low coulombic efficiency, have limited the practical applications of Li metal anodes. Herein, we report a 3D porous Cu current collector with a unique biporous and bicontinuous structure fabricated via a phase inversion Tape Casting Method. It has two types of pores: “finger-like” pores, serving as microchannels for efficient electrolyte and Li ion diffusion, and random small pores, serving as “cages” to accommodate Li deposits. Moreover, the high areal current density can be dissipated remarkably because of the large surface area, resulting in a stable solid electrolyte interphase and dendrite-free anode. The as-prepared porous Cu current collector maintains stable performance and ultra-low voltage hysteresis for over 2000 h in symmetric cells and maintains a CE of 97.6% for 200 cycles in half cells. The porous Cu@Li//LiFePO4 full cells also present excellent cycling and rate performances. In addition, the phase inversion Method is very suitable for mass production, indicating great potential for practical applications of Li metal anodes.
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Phase inversion Tape Casting and oxygen permeation properties of supported planar Zr0.84Y0.16O1.92–La0.8Sr0.2Cr0.5Fe0.5O3 − δ composite membrane
Solid State Ionics, 2016Co-Authors: Yu Zhang, Jianfeng Gao, Rong-hua Yuan, Chusheng ChenAbstract:Abstract The Zr 0.84 Y 0.16 O 1.92 (YSZ)–La 0.8 Sr 0.2 Cr 0.5 Fe 0.5 O 3 − δ (LSCrF) composite membrane was prepared using the phase inversion Tape Casting Method. Two slurries, one composed of YSZ and LSCrF powder, and the other composed also graphite, were used for preparation of the membrane. They were co-Tape cast onto a Mylar sheet, and then immersed in a water bath for solidification into a green Tape through phase inversion mechanism. After sintering at 1450 °C in the air, the green Tape was converted into a ceramic membrane. The sintered membrane possessed an asymmetric structure: a dense layer of thickness ~ 30 μm and a finger-like porous support of thickness ~ 1 mm. The membrane was further modified by applying a porous YSZ–LSCrF layer on its surfaces at the dense layer side and depositing Sm 0.2 Ce 0.8 O 2 nano-particles on the inner surfaces of the support. The oxygen permeability of the as-prepared membrane was measured by exposing its dense layer side to air and the support side to CO at elevated temperatures. The membrane exhibited desired oxygen permeability under the given measurement conditions. An oxygen permeation flux as large as 2.4 ml·cm − 2 ·min − 1 (STP) was observed at 900 °C, which is comparable to the hollow fiber membrane of the same composition. Owing to its desired oxygen permeability and good stability, the supported planar YSZ–LSCrF membrane developed in the present study holds promise for applications in chemical reactors integrating oxygen separation and oxygen-consuming chemical reactions such as partial oxidation of methane (POM). The phase inversion Tape Casting Method explored in the present study can be applied to the preparation of other ceramic membranes.
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facile one step forming of nio and yttrium stabilized zirconia composite anodes with straight open pores for planar solid oxide fuel cell using phase inversion Tape Casting Method
Journal of Power Sources, 2015Co-Authors: Hua Huang, Jie Lin, Yunlong Wang, Shaorong Wang, Changrong Xia, Chusheng ChenAbstract:Abstract The anode of NiO and yttria-stabilized zirconia (YSZ) with straight open pores is prepared by phase-inversion Tape Casting Method. In the as-prepared green Tape, its top and middle layers are derived from a slurry of NiO and YSZ, while the bottom layer from a slurry of graphite. The graphite layer is eliminated by calcination at elevated temperatures, leaving the finger-like porous layer exposed to the gas phase. A cell supported on the as-prepared anode substrate exhibits satisfactory electrochemical performances with a maximum power density of 780 mW cm−2 at 800 °C. The cell dose not show a convex-up curvature in I–V plots at high current density as often observed for most anode-supported cells, indicating the absence of concentration polarization which is in turn attributed to the open pore structure of the phase-inversion derived anode. The phase inversion Tape Casting technique explored in the present study involves almost the same equipments as and similar procedures to the conventional Tape Casting, and after further optimization it may become a simple and effective technique for mass production of anodes for SOFCs.
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phase inversion Tape Casting preparation and significant performance enhancement of ce0 9gd0 1o1 95 la0 6sr0 4co0 2fe0 8o3 δ dual phase asymmetric membrane for oxygen separation
Materials Letters, 2014Co-Authors: Hua Huang, Shiyang Cheng, Chusheng Chen, Jianfeng Gao, Jianxin YiAbstract:Abstract The dual-phase Ce 0.9 Gd 0.1 O 1.95 –La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3− δ asymmetric membrane was prepared via a phase-inversion Tape-Casting Method. The membrane consisted of a thicker porous support layer and a thinner dense layer. When the dense side of the membrane was coated with a La 0.6 Sr 0.4 CoO 3− δ catalytic activation layer, the oxygen permeation flux was markedly increased by a factor of 4.1–5.6, reaching 0.45 mL cm −2 min −1 at 900 °C. The flux increase can be attributed to enhanced surface oxygen exhange kinetics.
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asymmetric membrane for oxygen separation
2014Co-Authors: Hua Huang, Shiyang Cheng, Chusheng Chen, Jianfeng Gao, Jianxin YiAbstract:The dual-phase Ce0.9Gd0.1O1.95–La0.6Sr0.4Co0.2Fe0.8O3� δ asymmetric membrane was prepared via a phase-inversion Tape-Casting Method. The membrane consisted of a thicker porous support layer and a thinner dense layer. When the dense side of the membrane was coated with a La0.6Sr0.4CoO3� δ catalytic activation layer, the oxygen permeation flux was markedly increased by a factor of 4.1–5.6, reaching 0.45 mL cm � 2 min � 1 at 900 1C. The flux increase can be attributed to enhanced surface oxygen exhange kinetics.
