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Electrophoretic Deposition of TiO2/Nb2O5 Composite Electrode Thin Films for Photovoltaic Application 认领 引用 被引量：1
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作者 John Njagi Nguu Bernard Odhiambo Aduda Francis Wanjala Nyongesa Robinson Juma Musembi 《Journal of Energy and Power Engineering》 CAS 2014年第4期757-764,共8页
Nano sized powders of TiO2 （titanium dioxide） and Nb2O5 （Niobium （V） oxide） were used to fabricate TiO2/Nb2O5 composites thin films by EPD （electrophoretic deposition） technique. The metal oxide powders, toget... Nano sized powders of TiO2 （titanium dioxide） and Nb2O5 （Niobium （V） oxide） were used to fabricate TiO2/Nb2O5 composites thin films by EPD （electrophoretic deposition） technique. The metal oxide powders, together with magnesium nitrate hexahydrate pellets, were suspended in propan-2-ol inside an EPD cell. The electrodes, placed 1.2 cm apart, were partially immersed in the suspension and a DC potential applied across them. Key EPD process parameters, which include applied DC electric field, deposition time and solid concentration in suspension, were optimized through visual inspection and from UV-Vis-NIR spectrophotometer spectra. The highest （55%） transmittance was obtained for films with deposition time of 90 s, powder concentration of 0.01 g/40 mL, and 35 V DC （direct current） voltage. XRD micrographs confirmed that TiO2 and Nb2O5 particles were presented in the composite film. SEM （scanning electron microscope） micrographs of the composite electrode thin films showed that porous films of high quality with well controlled morphology were deposited by using the EPD technique. 展开更多
关键词 Electrophoretic deposition TiO2/Nb2O5 composite electrode thin films.
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V2O5/TiO2和Cs/Co3O4催化剂联合催化脱除NOx和N2O 认领 引用
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作者 苗静文 樊星 +1 位作者 刘若雯 张雅坤 《环境工程》 CAS CSCD 2026年第2期103-111,共9页
针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础... 针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础上,重点考察了在V2O5/TiO2催化剂之后串接2.0Cs/Co3O4催化剂的联合催化脱除NOx和N2O的性能,并采用N2吸脱附、XRD、XPS和O2-TPD等手段对催化剂理化特性进行表征。结果表明:V2O5/TiO2催化还原NOx时,进气中含2%H2O有利于拓宽活性温度窗口和提高N2选择性,以及抑制N2O形成。在Co3O4表面负载2.0%Cs显著提高了催化剂催化N2O分解性能,这可能与Cs的引入导致部分Co3+还原为Co2+以及催化剂表面形成了更多氧空位有关。高温(400℃)下通入2%H2O对2.0Cs/Co3O4催化N2O分解的抑制作用较弱,但同时通入2%H2O和50×10-6 NO显著抑制了2.0Cs/Co3O4催化剂的活性。采用先V2O5/TiO2后2.0Cs/Co3O4的两段式催化剂联合脱除NOx和N2O时,前端的V2O5/TiO2催化剂主要催化NOx的还原反应,N2O对脱硝过程的影响有限;在V2O5/TiO2催化剂高效脱除NOx(和NH3)的温度范围内,后端的2.0Cs/Co3O4催化剂可较为稳定地催化N2O分解;在温度400℃,进气中含2%H2O时,NOx和NH3转化率均接近100%,N2O转化率为61.3%。 展开更多
关键词 NOx还原 N2O分解 V2O5/TiO2 Cs/Co3O4 联合催化
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Preparation of Ni/Ti3O5@graphene oxide double heterojunction for enhancing hydrogen storage in MgH2 认领 引用 被引量：1
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作者 Zexuan Yang Zhendong Ma +4 位作者 Yongjin Zou Cuili Xiang Lixian Sun Yongpeng Xia Yong Shen Chua 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期579-591,共13页
Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetic... Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics.In this study,we prepared a Ni/Ti3O5@graphene oxide(GO)dual-heterojunction composite material via solvent heating,electrostatic adsorption,and calcination to improve the hydrogen storage capabilities of MgH2.Adding Ni/Ti3O5@GO to MgH2 lowered the initial dehydrogenation temperature of MgH2 to 183℃;at a dehydrogenation temperature of 275℃,6.4 wt.%of H2 escaped from the MgH2 bulk.In addition,the hydrogen storage material absorbed 1.8 wt.%H2 at 30℃ for 30 min.The calculated activation energy of dehydrogenation was 48.221±0.141 kJ·mol-1,which was significantly lower than that of the ball-milled MgH2(112.63±1.44 kJ·mol-1).Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes,resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH2.In this work,we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions. 展开更多
关键词 MGH2 Dual heterojunction Ni/Ti3O5@graphene oxide
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S型Bi6O5(OH)3(NO3)5·3H2O/BiOBr0.8I0.2异质结光催化剂的制备及其对RhB的可见光降解机理 认领 引用
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作者 李冬梅 贺帅 +5 位作者 蒋树贤 陈志翔 吴汉杰 张津明 戴自强 刘子业 《环境工程学报》 CAS CSCD 北大核心 2026年第7期2195-2208,共14页
本研究以Bi6O5(OH)3(NO3)5·3H2O(BON)、KBr及KI作为前驱体,利用水热法一步合成Bi6O5(OH)3(NO3)5·3H2O/BiOBr0.8I0.2(BON@BI)。通过改变BON与BiOBr0.8I0.2(BI)的质量比,探讨BON... 本研究以Bi6O5(OH)3(NO3)5·3H2O(BON)、KBr及KI作为前驱体,利用水热法一步合成Bi6O5(OH)3(NO3)5·3H2O/BiOBr0.8I0.2(BON@BI)。通过改变BON与BiOBr0.8I0.2(BI)的质量比,探讨BON@BI异质结的光催化活性以及对罗丹明B(RhB)的光催化降解机理。结果表明:当BON与BI的质量比为2:8时,对应的20%BON@BI可见光催化活性最强,记为BON@BIOPT,在可见光照30 min时对RhB的光降解率高达99.8%,约为BI光降解率(52.2%)的2倍。BON@BIOPT表面呈现均匀纳米片的杆状形貌,比表面积由BI的32.54 m2·g-1增至44.7 m2·g-1。BON@BIOPT的最大吸收边由BI对应的560 nm红移至580 nm,禁带宽度由BI的2.55 eV缩窄至2.43 eV。BON与BI复合形成S型异质结构,界面处形成的内建电场,有效抑制了强还原性光生电子与强氧化性光生空穴的结合并生成主要活性自由基O2·-与h+。BON@BIOPT具有良好的稳定性。经过7次重复对RhB的降解实验后,光降解效率仍高达88.6%。BON@BIOPT具有较好的抗干扰性。在不同pH以及阴离子的干扰下,降解率依然高达85%~98%。RhB的光降解过程包括N-去乙基化、断链共轭发色团、去氨基化等反应,并最终被矿化为低分子量有机物、无机盐、CO2和H2O。以上结果表明,BON@BIOPT兼具优异的光催化活性、稳定性及环境适应性,在实际水体有机污染物治理中具有良好的应用潜力。 展开更多
关键词 Bi6O5(OH)3(NO3)5·3H2O BiOBr0.8I0.2 S型异质结 内建电场 可见光催化活性 光降解特性
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Mechanistic,thermo-structural,and defect engineering strategies for V2O5/carbon hybrid cathodes toward high-performance Li-S batteries 认领 引用
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作者 Sunny Choudhary Diana C.Liza Castillo +3 位作者 Ivan Castillo Balram Tripathi Gerardo Morell Ram S.Katiyar 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第8期708-723,I0016,共16页
Lithium‑sulfur batteries(LSBs)offer high theoretical energy density but suffer rapid capacity fading caused by sluggish sulfur redox kinetics,polysulfide shuttling,and electrode passivation.Here,a thermally activated ... Lithium‑sulfur batteries(LSBs)offer high theoretical energy density but suffer rapid capacity fading caused by sluggish sulfur redox kinetics,polysulfide shuttling,and electrode passivation.Here,a thermally activated V2O5/multiwalled carbon nanotube(MWCNT)hybrid composite is engineered as a polar‑conductive host to regulate oxide‑carbon interfacial coordination and sulfur redox behavior via a dual‑encapsulation strategy.Structural analysis using X‑ray diffraction with Rietveld refinement reveals enhanced crystallographic coherence and reduced microstrain,accompanied by modulation of the V‑O coordination environment.Raman and Fourier transform infrared spectroscopy indicate controlled evolution of carbon defects and V‑O bonding,while X‑ray photoelectron spectroscopy demonstrates an increased V4+/V5+ratio after thermal activation,indicating modification of surface electronic structure.The hybrid cathode delivers an initial capacity of 1665 mAh g-1at C/20 as well as 1596 mAh g-1at C/10,retaining~770 mAh g-1after 300 cycles at C/10.Symmetric‑cell measurements and Li2S nucleation analysis further support enhanced polysulfide conversion kinetics.Postmortem analysis confirms suppressed polysulfide deposition and preservation of conductive pathways after prolonged cycling.This study establishes a structure‑defect‑interfacial kinetics correlation,demonstrating that controlled thermal modulation of a binary oxide‑carbon framework provides an effective strategy for improving Li‑S battery performance. 展开更多
关键词 Lithium-sulfur batteries V2O5-carbon hybrid cathodes Defect engineering Polysulfide conversion kinetics Interfacial charge-transfer Symmetric cell analysis Postmortem characterization
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A High-Performance Thermal Charging Cell with High Power Density and Long Runtime Enabled by Zn2+and NH4+Co-insertion 认领 引用
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作者 Zhiwei Han Shengliang Zhang +4 位作者 Helang Huang Jing Wang Hui Dou Tianran Zhang Xiaogang Zhang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第5期831-845,共15页
Zn-based thermal charging devices,utilizing the synergistic effect of ion thermoextraction and thermodiffusion,are able to efficiently convert thermal energy into electrical energy and storage in the devices,making th... Zn-based thermal charging devices,utilizing the synergistic effect of ion thermoextraction and thermodiffusion,are able to efficiently convert thermal energy into electrical energy and storage in the devices,making them a highly promising technology for low-grade heat recovery and utilization.However,the low output power density and energy conversion efficiency resulted by the slow diffusion kinetics of Zn2+hinder their development.Herein,we present a highperformance thermal charging cell design using Zn2+/NH4+hybrid ion electrolyte,which not only maintains the high output voltage of the Zn-based thermoelectric system,but also significantly enhances the output power density due to the fast diffusion kinetics of NH4+.Based on this strategy,the thermal charging cell displays a high thermopower of 12.5 mV K-1and an excellent normalized power density of 19.6 mW m-2K-2at a temperature difference of 35 K.The Carnot-relative efficiency is as high as 12.74%.Moreover,it can operate continuously for over 72 h when the temperature difference persists,achieving a balance between thermoelectric conversion and output.This work provides a simple and effective strategy for the design of high-performance thermal charging cells for low-grade heat conversion and utilization. 展开更多
关键词 Thermal charging cells Zn2+/NH4+hybrid ions Low-grade heat conversion and storage High power density Hydrated V2O5
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Dy3+掺杂BaO-Na2O-Nb2O5基玻璃陶瓷介电与储能性能 认领 引用
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作者 陈铃 王娇 +2 位作者 郭旭 杜欣润 刘少辉 《物理学报》 SCIE EI CAS CSCD 北大核心 2025年第19期345-354,共10页
电介质玻璃陶瓷材料兼具高功率密度与高能量密度,在脉冲功率器件的轻量化、小型化与集成化方面具有重要的应用前景.本研究采用高温熔融、快速冷却结合析晶工艺,成功制备了不同摩尔浓度稀土Dy3+掺杂的BaO-Na2O-Nb2O5基玻璃陶... 电介质玻璃陶瓷材料兼具高功率密度与高能量密度,在脉冲功率器件的轻量化、小型化与集成化方面具有重要的应用前景.本研究采用高温熔融、快速冷却结合析晶工艺,成功制备了不同摩尔浓度稀土Dy3+掺杂的BaO-Na2O-Nb2O5基玻璃陶瓷,并系统探究了Dy3+掺杂对玻璃陶瓷微观结构、结晶行为及介电储能性能的影响.结果表明,Dy3+掺杂对基体玻璃陶瓷的相结构无明显影响,但适量掺杂可促进钨青铜结构Ba2NaNb5O15陶瓷相的析出,同时提高玻璃陶瓷的结晶度,进而提升其介电常数.此外,Dy3+掺杂能够有效抑制晶粒生长,增强玻璃陶瓷的耐击穿场强.当Dy3+掺杂浓度为0.04 mol/mol时,玻璃陶瓷表现出优异的介电储能性能:介电常数达97,击穿场强提升至1485 kV/cm,储能密度高达8.01 J/cm3,是未掺杂玻璃陶瓷储能性能的1.87倍.本研究为优化玻璃陶瓷材料的介电储能性能提供了重要的实验依据和技术参考,对推动高性能脉冲功率器件的发展具有重要意义. 展开更多
关键词 BaO-Na2O-Nb2O5-SiO2-Al2O3-B2O3-ZrO2 储能性能 玻璃陶瓷 介电性能 稀土离子Dy3+掺杂
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Lu_2O_3/TiO_2/Nb_2O_5共稳定ZrO_2热障涂层材料研究 认领 引用
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作者 华云峰 潘伟 +3 位作者 李争显 杜继红 赵蒙 任小瑞 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2013年第8期1719-1721,共3页
采用Lu2O3/TiO2/Nb2O5作为ZrO2热障涂层材料的稳定剂,研究Lu2O3/TiO2/Nb2O5共稳定ZrO2(15%LTNSZ)热障涂层材料在900℃、40 mol%V2O5+60 mol%Na2SO4熔盐中的热腐蚀行为。结果表明:8%YSZ热障涂层材料热腐蚀2 h后,t相ZrO2全部相变为m相ZrO2... 采用Lu2O3/TiO2/Nb2O5作为ZrO2热障涂层材料的稳定剂,研究Lu2O3/TiO2/Nb2O5共稳定ZrO2(15%LTNSZ)热障涂层材料在900℃、40 mol%V2O5+60 mol%Na2SO4熔盐中的热腐蚀行为。结果表明:8%YSZ热障涂层材料热腐蚀2 h后,t相ZrO2全部相变为m相ZrO2,热腐蚀产物为尺寸较大的YVO4晶体;15%LTNSZ热障涂层材料热腐蚀20 h后,m相ZrO2的比例仅为5.5%,热腐蚀产物为尺寸较小的LuVO4晶体。与Y2O3稳定剂相比,Lu2O3/TiO2/Nb2O5稳定剂使ZrO2在40 mol%V2O5+60 mol%Na2SO4熔盐中的抗热腐蚀性能提高1个量级以上。 展开更多
关键词 Lu2O3/TiO2/Nb2O5共稳定ZrO2 热障涂层 熔盐 热腐蚀
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Elimination of 1,2-dichloroethane over(Ce,Cr)_x O_2/Nb_2O_5 catalysts: synergistic performance between oxidizing ability and acidity 认领 引用 被引量：13
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作者 Jie Wan Peng Yang +1 位作者 Xiaolin Guo Renxian Zhou 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第7期1100-1108,共9页
A series of(Ce,Cr)xO2/Nb2O5 catalysts with different(Ce,Cr)xO2 to Nb2O5 mass ratios were synthesized by the deposition-precipitation method for use in deep catalytic oxidation of 1,2-dichloroethane(DCE), which is one ... A series of(Ce,Cr)xO2/Nb2O5 catalysts with different(Ce,Cr)xO2 to Nb2O5 mass ratios were synthesized by the deposition-precipitation method for use in deep catalytic oxidation of 1,2-dichloroethane(DCE), which is one of the typical chlorinated volatile organic compound pollutants. The textural properties were characterized by X-ray diffraction, N2 adsorption/desorption isotherms, UV-Raman spectroscopy, and scanning electron microscopy. The surface acidity and the redox properties were characterized by ammonia temperature-programmed desorption and H2 temperature-programmed reduction, respectively. The results show that the addition of a proper amount of(Ce,Cr)xO2 over Nb2O5 significantly improves the intrinsic catalytic activity towards the deep oxidation of DCE, and only a very small amount of C2H3Cl is detected as the byproduct of the oxidation process. Further study reveals the existence of an obvious synergistic effect between Nb2O5, with abundant strong acid sites, and(Ce,Cr)xO2, with strong oxidation sites, as the strong acid sites of Nb2O5 promote the adsorption and dehydrochlorination of DCE, while the strong oxidation sites of(Ce,Cr)xO2 contribute to the deep oxidation of the reactant, intermediates, and byproducts. 展开更多
关键词 1,2-dichloroethane Deep oxidation Mixed oxide Nb2O5 Synergistic effect
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Preparation, characterization and photocatalytic behavior of WO_3-TiO_2/Nb_2O_5 catalysts 认领 引用 被引量：9
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作者 童海霞 陈启元 +3 位作者 胡慧萍 尹周澜 李洁 周建良 《Journal of Central South University of Technology》 2007年第6期788-792,共5页
TiO2/Nb2O5 photocatalyst loaded with WO3 （WO3-TiO2/Nb2O5） was prepared by a modified hydrolysis process, and characterized by X-ray diffractometry, transmission electron microscopy, Raman spectra and UV-Vis diffuse ... TiO2/Nb2O5 photocatalyst loaded with WO3 （WO3-TiO2/Nb2O5） was prepared by a modified hydrolysis process, and characterized by X-ray diffractometry, transmission electron microscopy, Raman spectra and UV-Vis diffuse refraction spectroscopy. The photocatalytic activity of WO3-TiO2/Nb2O5 was investigated by employing splitting of water for O2 evolution. The results indicate that WO3 loading can pronouncedly improve the photocatalytic activity of TiOjNb2O5 by using Fe^3＋ as an electron acceptor under UV irradiation. The optimum molar fraction of the loaded WO3 is 2%, and the largest speed of O2 evolution for 2% WO3-TiO2/Nb2O5 catalyst is 151.8 μmol/（L·h）. 展开更多
关键词 photocatalysis load oxygen evolution rutile TiO2 Nb2O5 WO3
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Synthesis of a novel hexagonal porous TT-Nb2O5 via solid state reaction for high-performance lithium ion battery anodes 认领 引用 被引量：9
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作者 ZHOU Yu LIU Ke +4 位作者 ZHOU Yue NI Jia-hua DOU Ai-chun SU Ming-ru LIU Yun-jian 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第12期3625-3636,共12页
Hexagonal porous Nb2O5 was synthesized for the first time via a facile solid-state reaction.The structure and electrochemical properties have been optimized through tuning heating temperature.X-ray diffraction results... Hexagonal porous Nb2O5 was synthesized for the first time via a facile solid-state reaction.The structure and electrochemical properties have been optimized through tuning heating temperature.X-ray diffraction results indicate that pseudo hexagonal Nb2O5(TT-Nb2O5)and orthorhombic Nb2O5 have been synthesized at different temperatures.Hexagonal sheet and porous structure of Nb2O5 were characterized by scanning electron microscopy and N2-adsorption-desorption isotherms.The as-prepared TT-Nb2O5(heated at 600℃)shows the best performance with a remarkable charge capacity of 178 mA∙h/g at 0.2C,which is higher than that of T-Nb2O5.Even at 20℃,TT-Nb2O5 offers unprecedented rate capability up to 86 mA∙h/g.The high rate capacity is due to pseudocapacitive Li+intercalation mechanism of TT-Nb2O5.The reported results demonstrate that Nb2O5 with good crystal structure and high specific surface area is a powerful composite design for high-rate and safe anode materials. 展开更多
关键词 lithium-ion battery Nb2O5 hexagonal porous sheet electrochemical performance
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Nb_2O_5掺杂对TiO_2陶瓷性能的影响 认领 引用 被引量：5
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作者 周文斌 唐超群 +3 位作者 薛霞 胡连峰 马新国 黄金球 《材料科学与工程学报》 CAS 北大核心 2006年第2期255-257,共3页
在Nb2O5含量X为0．1～1．5％的范围内，研究了Nb2O5掺杂对TiO2压敏陶瓷电性能的影响。发现x=0．7％的样品显示出最低的压敏电压（Eb=8．57V／mm）以及最高的相对介电常数2．385×10^4。分析认为Nb2O5掺杂的实质是Nb^5＋固溶于TiO2... 在Nb2O5含量X为0．1～1．5％的范围内，研究了Nb2O5掺杂对TiO2压敏陶瓷电性能的影响。发现x=0．7％的样品显示出最低的压敏电压（Eb=8．57V／mm）以及最高的相对介电常数2．385×10^4。分析认为Nb2O5掺杂的实质是Nb^5＋固溶于TiO2中取代Ti^4＋使晶粒半导化，但掺杂量受晶格畸变作用有一定限制。 展开更多
关键词 TiO2 Nb2O5掺杂 压敏
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Dissolution behaviors of Ta_2O_5,Nb_2O_5 and their mixture in KOH and H_2O system 认领 引用 被引量：4
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作者 王晓辉 郑诗礼 +1 位作者 徐红彬 张懿 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第10期2006-2011,共6页
The dissolution behaviors of Ta2O5,Nb2O5 and their mixture in KOH and H2O system were investigated.A L9(34) orthogonal design was used to study the effects of reaction temperature,mass ratio of KOH to Ta2O5,and reacti... The dissolution behaviors of Ta2O5,Nb2O5 and their mixture in KOH and H2O system were investigated.A L9(34) orthogonal design was used to study the effects of reaction temperature,mass ratio of KOH to Ta2O5,and reaction time on the dissolution rate of tantalum.It was found that the effect of reaction temperature on the dissolution rate of tantalum was much greater than that of the other factors.The results of factorial experiments showed that Ta2O5 was mainly transformed into insoluble potassium tantalate at low temperature(350 ℃) and transformed into soluble potassium tantalate at high temperature(450 ℃).The insoluble potassium tantalate was analyzed by XRD,which was proved to be KTaO3.Differently,almost all Nb2O5 was transformed into soluble potassium niobate at 350-450℃.As for the mixture of Ta2O5 and Nb2O5,the dissolution rate of tantalum increased and the dissolution rate of niobium decreased as an interaction existed between niobium and tantalum.And increasing the mole ratio of Nb2O5 to Ta2O5 in the mixture was beneficial to the dissolution of both Ta2O5 and Nb2O5.In addition,the mechanism of the interaction between niobium and tantalum was also investigated through phase and chemical analysis. 展开更多
关键词 Ta2O5 Nb2O5 KOH dissolution behavior mechanism solid-solution
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TiO_2添加对Bi_2O_3-ZnO-Nb_2O_5系介质材料结构和性能的影响 认领 引用 被引量：12
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作者 彭邓山 沈波 +1 位作者 张良莹 姚熹 《压电与声光》 EI CAS 北大核心 2005年第4期395-397,共3页
研究了添加不同含量的T iO2到-βB i2O3-ZnO-N b2O5(-βBZN)中,同时减少相应的B i2O3的含量对BZN介质材料结构和性能的影响。研究表明,T iO2添加到β-BZN中,材料的结构和性能都有很大的变化,主要表现在随着T iO2添加量的增加,材料的相... 研究了添加不同含量的T iO2到-βB i2O3-ZnO-N b2O5(-βBZN)中,同时减少相应的B i2O3的含量对BZN介质材料结构和性能的影响。研究表明,T iO2添加到β-BZN中,材料的结构和性能都有很大的变化,主要表现在随着T iO2添加量的增加,材料的相结构发生了变化,由低对称的单斜焦绿石结构β相转变为高对称的立方焦绿石结构α相,因而材料在微波频段下的介电性能发生了较大的变化,介电常数比纯β-BZN有了显著提高,且随着T iO2含量的增加,介电常数先增加后减少,温度系数则由正温度系数转变为负温度系数。 展开更多
关键词 Bi2O3-ZnO-Nb2O5 系陶瓷 温度系数 相结构 微波介电性能
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八氢-4,7-甲基-茚-1,2,5,6-四醇合成工艺研究 认领 引用
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作者 宋国强 周彤彤 +2 位作者 倪明 冯筱晴 唐龙 《化学研究与应用》 CAS 北大核心 2026年第8期2102-2109,共8页
以双环戊二烯为原料,双氧水为氧化剂,在M-3#阳离子交换树脂(M即负载离子类型)催化剂的催化作用下,“一步法”合成目标产物八氢-4,7-甲基-茚-1,2,5,6-四醇,提出了对该催化氧化反应的优化工艺、产物的定量分析方法、以及产品纯化方法。首... 以双环戊二烯为原料,双氧水为氧化剂,在M-3#阳离子交换树脂(M即负载离子类型)催化剂的催化作用下,“一步法”合成目标产物八氢-4,7-甲基-茚-1,2,5,6-四醇,提出了对该催化氧化反应的优化工艺、产物的定量分析方法、以及产品纯化方法。首先考察了反应温度、溶剂、催化剂类型、氧化剂浓度、氧化剂配比等工艺条件对反应的影响,结果表明,在反应温度70℃,二氯乙烷做溶剂,25%Mn-3#阳离子交换树脂(Mn即负载金属离子,3#即阳离子交换树脂型号)做催化剂,20%H₂O₂溶液,双环戊二烯与H₂O₂的摩尔比为1:3的条件下,反应12h,双环戊二烯转化率为96.12%,八氢-4,7-甲基-茚-1,2,5,6-四醇收率为95.52%。选择合适的重结晶溶剂,对八氢-4,7-甲基-茚-1,2,5,6-四醇纯化,得到纯度98.23%固体产物,通过红外光谱、液质联用仪、气相色谱仪等对纯化产物进行分析。较已有的两步法,该合成工艺具有清洁、操作简单、高效、纯度高等特点,得到的八氢-4,7-甲基-茚-1,2,5,6-四醇可替代季戊四醇应用于高端材料领域。 展开更多
关键词 双环戊二烯 八氢-4 7-甲基-茚-1 2 5 6-四醇 阳离子交换树脂催化剂 H₂O₂
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Nb_2O_5-TiO_2复合氧化物结构与光催化性能研究 认领 引用 被引量：4
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作者 何杰 杨万秀 《安徽大学学报（自然科学版）》 CAS 北大核心 2008年第5期65-69,共5页
采用共沉淀法制备Nb2O5-TiO2复合氧化物,通过XRD、LRS和UV-vis DRS等方法考察Nb/Ti原子比和焙烧温度对Nb2O5-TiO2复合氧化物结构的影响,以水体中苯酚的降解为探针反应考察复合氧化物的光催化活性.结果表明,Nb2O5-TiO2复合氧化物结构与Nb... 采用共沉淀法制备Nb2O5-TiO2复合氧化物,通过XRD、LRS和UV-vis DRS等方法考察Nb/Ti原子比和焙烧温度对Nb2O5-TiO2复合氧化物结构的影响,以水体中苯酚的降解为探针反应考察复合氧化物的光催化活性.结果表明,Nb2O5-TiO2复合氧化物结构与Nb/Ti原子比和制备温度有关.随着Nb5+进入TiO2晶格,在可见光区域形成一新的吸收带,该吸收带强度随Nb/Ti原子比和焙烧温度变化,当焙烧温度高于973 K时,可见光区域吸收带消失.低Nb/Ti原子比下,Nb5+对TiO2由锐钛矿相向金红石相转变具有抑制作用,而高的Nb/Ti原子比下Ti4+对Nb2O5晶相结构具有导向作用.复合物对水体中苯酚的光催化降解活性随着Nb/Ti原子比增加而降低. 展开更多
关键词 Nb2O5 TiO2 UV-vis-DRS 复合氧化物结构 光催化
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火焰喷淬制备BaO-TiO2和La2O3-Nb2O5玻璃微球及性能研究 认领 引用 被引量：1
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作者 张英 马晓光 +3 位作者 李晓禹 李建强 李江涛 贺刚 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2020年第2期482-486,共5页
分别以BaO、TiO2和La2O3、Nb2O5为原料采用火焰喷淬法制备了不含网络形成体的BaTi2O5(BTO)和35La2O3-65Nb2O5 (LNO)玻璃微球。结果表明,所有BTO为透明的、表面光滑、无结晶痕迹的玻璃微球,粒径分布集中在8~40μm,且具有较低的非晶形成能... 分别以BaO、TiO2和La2O3、Nb2O5为原料采用火焰喷淬法制备了不含网络形成体的BaTi2O5(BTO)和35La2O3-65Nb2O5 (LNO)玻璃微球。结果表明,所有BTO为透明的、表面光滑、无结晶痕迹的玻璃微球,粒径分布集中在8~40μm,且具有较低的非晶形成能力;而大部分的LNO为透明的、具有光滑表面的玻璃微球,粒径分布集中在10~40μm,少量粒径较大的LNO微球表面粗糙,存在微米级LaNbO4和LaNb3O9晶粒。计算结果显示,BTO和LNO玻璃微球均具有高折射率,分别为2.20和2.23,是非常有应用前景的窗口、镜头以及反光标志膜材料。 展开更多
关键词 火焰喷淬 玻璃微球 TiO2基玻璃 Nb2O5基玻璃
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Nb5+掺杂与热处理对TiO_2基材料气敏特性的影响 认领 引用 被引量：2
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作者 裴素华 孙海波 +2 位作者 王强 孙振翠 石礼伟 《无机材料学报》 SCIE EI CAS 北大核心 2004年第4期943-947,共5页
TiO2是响应三甲胺(TMA)气体最佳的金属氧化物半导体材料,为保持TiO2基TMA旁热式气敏器件具有较高灵敏度和较低空气阻值(Ra),相应降低器件加热功率RH,本文通过N2气氛高温退火、高价Nb5+掺杂和长时间烧结等方法,提高TiO2基敏感材料电导率... TiO2是响应三甲胺(TMA)气体最佳的金属氧化物半导体材料,为保持TiO2基TMA旁热式气敏器件具有较高灵敏度和较低空气阻值(Ra),相应降低器件加热功率RH,本文通过N2气氛高温退火、高价Nb5+掺杂和长时间烧结等方法,提高TiO2基敏感材料电导率获得成功。实验与理论证明:降低氧分压可增强TiO2自身半导化程度;掺入10％左右Nb2O5,Nb5+替代Ti4+形成固溶体,可使TiO2得到最佳半导化效果;采用长时间的烧结处理,促使Ti3+转化为Ti4+,进一步提高材料电导率和器件稳定性,从而为制造低阻、高灵敏度、高选择性动物食品测鲜传感器开辟了一条新途径。 展开更多
关键词 TiO2 N2退火 Nb^5+掺杂 长时效烧结
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Nb_2O_5掺杂方式对BaTiO_3基无铅PTCR陶瓷性能的影响 认领 引用 被引量：2
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作者 蒲永平 吴海东 韦继锋 《中国陶瓷》 CAS CSCD 北大核心 2011年第6期10-13,共4页
采用固相法制备了BaTiO3基无铅PTCR陶瓷,通过加入Na0.5Bi0.5TiO3作为移峰剂来提高居里点,同时采用不同方式引入施主掺杂剂Nb2O5来降低室温电阻率。对陶瓷的XRD物相分析、SEM微观形貌分析和PTCR性能测试,结果表明引入Nb2O5方式会对BaTiO... 采用固相法制备了BaTiO3基无铅PTCR陶瓷,通过加入Na0.5Bi0.5TiO3作为移峰剂来提高居里点,同时采用不同方式引入施主掺杂剂Nb2O5来降低室温电阻率。对陶瓷的XRD物相分析、SEM微观形貌分析和PTCR性能测试,结果表明引入Nb2O5方式会对BaTiO3基陶瓷的晶胞参数、微观形貌和室温电阻率产生很大影响。随着Nb2O5摩尔浓度的增加,室温电阻率先迅速减小,然后逐渐增大,而且当Nb2O5摩尔含量为0.2mol%时,室温电阻率最小。掺入0.2mol%Nb2O5和3.0mol%Na0.5Bi0.5TiO3时,BaTiO3基陶瓷的室温电阻率为3830Ω.cm,Tc为142℃,PTC突跳幅度为3个数量级。 展开更多
关键词 BaTiO3 PTCR陶瓷 室温电阻率 Nb2O5
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TiO_2-In-Nb_2O_5敏感材料响应TMA气敏特性分析 认领 引用 被引量：4
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作者 黄萍 裴素华 《材料导报》 CAS 北大核心 2006年第7期126-128,共3页
以含In的TiO2为基质,与重量比为10%的Nb2O5混合,TiO2-In-Nb2O5混合敏感材料有效解决了三甲胺(TMA)动物食品测鲜气敏器件中提高电导率和保持高灵敏度之间的矛盾。并利用XRD、SEM对该混晶体的结构、形貌及其机理进行分析,发现:该富钛混晶... 以含In的TiO2为基质,与重量比为10%的Nb2O5混合,TiO2-In-Nb2O5混合敏感材料有效解决了三甲胺(TMA)动物食品测鲜气敏器件中提高电导率和保持高灵敏度之间的矛盾。并利用XRD、SEM对该混晶体的结构、形貌及其机理进行分析,发现:该富钛混晶体中颗粒间的空隙增大、颗粒颈部变细,有效提高了响应TMA敏感特性;混合过程中所形成含铌的氧化态混晶体是缺氧态的,氧空位的增多有助于敏感材料电导率的增加。 展开更多
关键词 三甲胺 敏感材料 TiO2-In-Nb2O5 混晶体
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