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Optical Switching of Robust Ferroelectric Polarization on Epitaxial Hf0.5Zr0.5O2Integrated with BaTiO3 认领 引用
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作者 Wenjing Dong Huan Tan +6 位作者 Jingye Zou Alberto Quintana Tingfeng Song César Magén Claudio Cazorla Florencio Sánchez Ignasi Fina 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第7期540-554,共15页
Optical switching of ferroelectric polarization is of interest for wireless and energy-efficient control of logic states.So far,this phenomenon has been widely demonstrated only in ferroelectric perovskites,while stud... Optical switching of ferroelectric polarization is of interest for wireless and energy-efficient control of logic states.So far,this phenomenon has been widely demonstrated only in ferroelectric perovskites,while studies on other emerging ferroelectrics remain limited.In this regard,the paradigmatic example of a technologically relevant ferroelectric material is HfO2.However,HfO2has a very wide bandgap,limiting light absorption.So far,the proposed strategies to enhance light absorption in HfO2-based systems are detrimental to ferroelectric properties,i.e.,bandgap lowering or on-purpose defect introduction,which reduce switchable polarization and increase the presence of leakage currents.Here,we show that good ferroelectric properties,i.e.,sizeable polarization(up to 15μC cm-2),low leakage current(under 10-6A cm-2),high endurance(up to 108 cycles)and fast switching(<50 ns),can be achieved in epitaxial Hf0.5Zr0.5O2films through an alternative strategy,BaTiO3capping.While ferroelectric properties are remarkable,we demonstrate that the presence of BaTiO3allows light absorption and the concomitant electric field generation,as supported by density functional theory calculations,which enables optical switching of polarization in Hf0.5Zr0.5O2under 405 nm illumination.It is observed that optical switching is more efficient in films with thicker BaTiO3capping layer.The high polarizability of BaTiO3contributes to minimizing degradation in the ferroelectric response of the system.The results presented here indicate that appropriate designs can be followed to obtain optical switching of polarization in ferroelectric HfO2while preserving main functional properties. 展开更多
关键词 HfO2 Hafnium oxide Multilayers Hf0.5Zr0.5O2 Ferroelectric Optoelectric
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基于Cu和TiN盖层的Hf0.5Zr0.5O2薄膜铁电性能比较研究 认领 引用
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作者 王岛 张岩 +2 位作者 邹正淼 王佳丽 陆旭兵 《湘潭大学学报(自然科学版)》 CAS 2019年第5期127-135,共9页
该文采用原子层沉积在Si/SiO2/TiN基底上制备了20 nm Hf0.5Zr0.5O2(HZO)薄膜,并分别以TiN和Cu为盖层构筑了HZO铁电电容器.掠入射X射线衍射测试表明,TiN和Cu作为盖层的HZO薄膜都具有明显的正交相.系统比较研究了Cu和TiN盖层对HZO薄膜的... 该文采用原子层沉积在Si/SiO2/TiN基底上制备了20 nm Hf0.5Zr0.5O2(HZO)薄膜,并分别以TiN和Cu为盖层构筑了HZO铁电电容器.掠入射X射线衍射测试表明,TiN和Cu作为盖层的HZO薄膜都具有明显的正交相.系统比较研究了Cu和TiN盖层对HZO薄膜的铁电、漏电和可靠性的影响.极化-电压测试表明,TiN和Cu为盖层的HZO薄膜在±4 V扫描电压下,剩余极化强度(2Pr)值分别为40.4μC/cm^2和21.2μC/cm^2.相应的矫顽电压分别为+1.7 V和+2.0 V.极化疲劳与保持特性测试表明,在经过2.3×10^8循环次数后,以TiN和Cu为盖层的HZO薄膜的2 P r值分别衰减了39.7%和45.6%.经过1.3×10^4 s保持测试,TiN和Cu盖层的HZO薄膜的2 P r值从初始34.4μC/cm^2和17.1μC/cm^2分别下降到了22.6μC/cm^2和1.6μC/cm^2.上述结果说明,金属盖层是影响HZO铁电性的一个非常重要的因素.盖层的功函数、热膨胀系数、界面缺陷和界面介电层都是导致HZO薄膜铁电性差异的可能机制.该文工作对于进一步理解HZO铁电性起源和影响机制提供了有意义的借鉴,将有助于发展未来高性能的HZO铁电存储器和负电容晶体管. 展开更多
关键词 Hf0.5Zr0.5O2薄膜 铁电性能 金属盖层 原子层沉积
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Enhancing ferroelectric properties of Hf0.5Zr0.5O2 thin films using the HfN/TiN and W/TiN bi-layer bottom electrodes 认领 引用 被引量:1
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作者 Han Sol Park Joong Chan Shin +7 位作者 Kyung Do Kim Seong Jae Shin Jae Hee Song Seung Kyu Ryoo In Soo Lee Suk Hyun Lee Hyunwoo Nam Cheol Seong Hwang 《Journal of Materiomics》 SCIE CSCD 2025年第6期252-262,共11页
This study clarifies the influence of single-layer(TiN,HfN,W)and bi-layer(HfN/TiN,W/TiN)bottom electrodes(BEs)on the ferroelectric performance and reliability of the 10-nm-thick Hf0.5Zr0.5O2(HZO)thin films.A ... This study clarifies the influence of single-layer(TiN,HfN,W)and bi-layer(HfN/TiN,W/TiN)bottom electrodes(BEs)on the ferroelectric performance and reliability of the 10-nm-thick Hf0.5Zr0.5O2(HZO)thin films.A smaller thermal expansion coefficient in HfN or W imposes higher in-plane tensile stress on the HZO thin films,facilitating the polar orthorhombic(o-)phase fraction and enhancing remanent polarization(Pr).However,thicker interfacial layers formed when HfN or W single-layer BE and HZO contacted directly,leading to excessive leakage current and degraded ferroelectric performance.These excessive interfacial layers were effectively suppressed by inserting a thin(5 nm-20 nm)TiN layer on the HfN or W BEs.As a result,the HZO thin films on the HfN/TiN and W/TiN bi-layer BEs decrease the HZO grain size,facilitating the o-phase formation(increasing Pr)and lowering the film's coercive field.However,the higher surface roughness of the W/TiN bi-layer BEs induced excessive leakage current and reliability degradation.In contrast,the HfN BEs with a 10-or 20-nm-thick upper TiN layer lower the surface roughness of the BEs,thereby eliminating the adverse effects.As a result,the HfN 40 nm/TiN 10 nm/HZO/TiN stack exhibited enhanced ferroelectric performance up to 109switching cycles with a lower cycling field of 2.7 MV/cm than the TiN 50 nm/HZO/TiN stack with a cycling field of 3.7 MV/cm. 展开更多
关键词 Ferroelectric Hf0.5Zr0.5O2 Coefficient of thermal expansion Tensile stress Bi-layer bottom electrode
Co/Ce0.5Zr0.5O2催化剂的制备及甲烷部分氧化制合成气 认领 引用 被引量:16
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作者 余长林 胡久彪 +2 位作者 翁维正 周晓春 陈喜蓉 《燃料化学学报》 CSCD 北大核心 2012年第4期418-423,共6页
利用共沉淀法制备了具有介孔结构的Ce0.5Zr0.5O2固溶体载体,然后浸渍不同质量分数(10%、20%、30%)的活性组分钴,制备了系列Co/Ce0.5Zr0.5O2催化剂。利用N2物理吸附(BET)、X射线粉末衍射(XRD)、H2-程序升温还原(H2-TPR)、扫描电子显微镜(... 利用共沉淀法制备了具有介孔结构的Ce0.5Zr0.5O2固溶体载体,然后浸渍不同质量分数(10%、20%、30%)的活性组分钴,制备了系列Co/Ce0.5Zr0.5O2催化剂。利用N2物理吸附(BET)、X射线粉末衍射(XRD)、H2-程序升温还原(H2-TPR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、程序升温氧化(TPO)和热重(TG)等手段对制备和反应后的催化剂进行了表征,研究了它们对甲烷部分氧化制合成气反应的催化性能。研究结果表明,铈锆固溶体负载的钴比较容易被还原,该系列催化剂具有较高的活性和对H2及CO的选择性,且随Co含量的增加,催化剂的活性和对H2和CO的选择性得到提高的同时,也增强了催化剂的抗积炭性能。 展开更多
关键词 Ce0.5Zr0.5O2固溶体 甲烷部分氧化 合成气
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Ce-Zr-O固溶体的制备和表征 认领 引用 被引量:27
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作者 罗孟飞 林瑞 +2 位作者 陈敏 袁贤鑫 郑小明 《中国稀土学报》 CAS 北大核心 2000年第1期35-37,共3页
采用硝酸盐直接分解法、共沉淀法、苹果酸溶胶 凝胶法和柠檬酸溶胶 凝胶法制备了Ce Zr O复合氧化物并进行了表征。溶胶 凝胶法制得的Ce Zr O为立方的Ce0 .5Zr0 .5O2 复合氧化物 (其中少量具有立方性质的t″相 ) ,而直接分解和共沉淀法... 采用硝酸盐直接分解法、共沉淀法、苹果酸溶胶 凝胶法和柠檬酸溶胶 凝胶法制备了Ce Zr O复合氧化物并进行了表征。溶胶 凝胶法制得的Ce Zr O为立方的Ce0 .5Zr0 .5O2 复合氧化物 (其中少量具有立方性质的t″相 ) ,而直接分解和共沉淀法制得的是由立方Ce0 .8Zr0 .2 O2 和四方Ce0 .2 Zr0 .8O2 固溶体组成的复合氧化物。不同制备方法制得的样品由于物相组成不同 ,还原性能也有较大差别。差热分析和X射线衍射分析结果表明 ,凝胶在燃烧的同时生成了Ce0 .5Zr0 .5O2 固溶体。 展开更多
关键词 固溶体 稀土元素 铈锆氧复合物 催化
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锆钛复合氧化物的制备及用作Pt三效催化剂载体的性能 认领 引用 被引量:15
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作者 喻瑶 林涛 +3 位作者 张丽娟 郭家秀 龚茂初 陈耀强 《无机材料学报》 SCIE EI CAS 北大核心 2008年第1期71-76,共6页
用共沉淀法制备了Zr0.5Ti0.5O_2复合氧化物,考察了沉淀时的pH值、温度及焙烧温度对样品织构性能的影响.分别用BET、XRD、NH_3-TPD对样品的织构、结构性能和表面酸性进行了表征.将经过不同温度焙烧后的样品作为载体制备成Pt/Zr_(0.... 用共沉淀法制备了Zr0.5Ti0.5O_2复合氧化物,考察了沉淀时的pH值、温度及焙烧温度对样品织构性能的影响.分别用BET、XRD、NH_3-TPD对样品的织构、结构性能和表面酸性进行了表征.将经过不同温度焙烧后的样品作为载体制备成Pt/Zr0.5Ti0.5O_2催化剂,考察了催化剂对C_3H_8、CO、NO的催化性能,并与传统的以La-Al_2O_3为载体的Pt/La-Al_2O_3汽车尾气三效催化剂进行了比较.结果表明:当沉淀时的pH=11、温度为25℃、焙烧温度为550℃时,所制得的样品具有较好的织构性能(比表面积为195m^2·g-1、孔容为0.28mL·g-1)、较强的表面酸性和较宽的酸度分布;用该样品制备的汽车尾气三效催化剂与传统的以La-Al_2O_3作载体的Pt/La-Al_2O_3催化剂相比,具有更好的HC和CO催化性能和优异的NO转化性能. 展开更多
关键词 Zr0.5Ti0.5O2复合氧化物 汽车尾气三效催化剂 性能
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Zr_xTi_xAl1-2xO_2的制备及其在三效催化剂上的应用 认领 引用 被引量:10
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作者 喻瑶 龚茂初 +3 位作者 郭家秀 林涛 袁书华 陈耀强 《无机化学学报》 SCIE CAS 北大核心 2007年第8期1453-1456,共4页
Zr0.5Ti0.5O2(ZT) and Zr0.25Ti0.25Al0.5O2(ZTA) mixed oxides were prepared by co-precipitation method and characterized by low temperature adsorption-desorption,XRD and NH3-TPD. The activity of Pt/Zr0.5Ti0.5O2 and Pt/ Z... Zr0.5Ti0.5O2(ZT) and Zr0.25Ti0.25Al0.5O2(ZTA) mixed oxides were prepared by co-precipitation method and characterized by low temperature adsorption-desorption,XRD and NH3-TPD. The activity of Pt/Zr0.5Ti0.5O2 and Pt/ Zr0.5Ti0.5Al0.5O2 catalysts was evaluated using the simulated gases. The results show that ZTA samples exhibit higher specific surface area,larger pore volume and proper surface acidic amount and acidity in comparison with ZT. The results of the catalytic test indicate that Pt/ZT and Pt/ZTA catalysts exhibit excellent low-temperature catalytic activity and lower light-off temperatures of hydrocarbon,carbon monoxide and nitrogen oxides,especially better conversion for nitrogen oxides (NOx). The addition of Al2O3 into ZT enhanced the anti-aging property of Pt/ ZTA catalysts due to the excellent textural,structural,surface acidity and thermal stability. 展开更多
关键词 XRD TPD Zr0.25Ti0.25Al0.5O2氧化物 Pt 三效催化剂(TWC)
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K-Ce0.5Zr0.5O_2催化碳颗粒物燃烧性能 认领 引用 被引量:9
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作者 朱玲 王学中 +1 位作者 於俊杰 郝郑平 《物理化学学报》 SCIE CAS 北大核心 2005年第8期840-845,共6页
用等体积浸渍法制备了不同K负载量的xKNO3-Ce0.5Zr0.5O2系列催化剂,用程序升温氧化反应(TPO)考察催化剂对碳颗粒物(soot)燃烧的催化活性.并采用XRD、BET、FT-IR、XPS等技术对KNO3负载催化剂进行表征.结果表明KNO3负载量对催化剂的比表... 用等体积浸渍法制备了不同K负载量的xKNO3-Ce0.5Zr0.5O2系列催化剂,用程序升温氧化反应(TPO)考察催化剂对碳颗粒物(soot)燃烧的催化活性.并采用XRD、BET、FT-IR、XPS等技术对KNO3负载催化剂进行表征.结果表明KNO3负载量对催化剂的比表面、表面化学环境有显著的影响;KNO3能使催化剂对soot的催化燃烧活性有较大提高,且存在最佳负载量,当x=0.5时,催化剂的活性最好,碳颗粒物的起燃温度(T)i和峰顶温度(Tp)分别为290℃和360℃.在反应过程中,KNO3熔融状态的形成和K2CO3的生成,使催化活性明显提高. 展开更多
关键词 K-Ce0.5Zr0.5O2 碳颗粒物 催化氧化
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Structure and catalytic property of CeO_2-ZrO_2-Fe_2O_3 mixed oxide catalysts for diesel soot combustion: Effect of preparation method 认领 引用 被引量:8
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作者 顾振华 桑秀丽 +1 位作者 王华 李孔斋 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第9期817-823,共7页
A series of Ceo.sFeo.30Zr0.20O2 catalysts were prepared by different methods (co-precipitations method, citric acid sol-gel method, impregnation method, physical mixed method, and hydrotherrnal method) and character... A series of Ceo.sFeo.30Zr0.20O2 catalysts were prepared by different methods (co-precipitations method, citric acid sol-gel method, impregnation method, physical mixed method, and hydrotherrnal method) and characterized by X-ray diffraction (XRD), Raman spectroscopy, Brunauer-Emmett-Teller (BET) and H2-TPR measurements. Potential of the catalysts in the soot oxidation was evaluated in a temperature-programmed oxidation (TPO) apparatus. The results showed that all the Fe3+ and Zr4+ were incor- porated into ceria lattice to form a pure Ce-Fe-Zr-O solid solution for the co-precipitation sample, but two kinds of Fe phases ex- isted in the Ce-Fe-Zr-O catalysts prepared by other methods: Fe3+ incorporated into CeO2 lattice and dispersed Fe2O3 clusters. The free Fe2O3 clusters could improve the activity of catalysts for soot oxidation comparing with the pure Ce-Fe-Zr-O solid solution owing to the synergetic effect between free Fe2O3 and surface oxygen vacancies. In addition, the activity of catalysts strongly relied on the surface reducibility of free Fe2O3 particles. Holding both abundant free Fe2O3 particles and high oxygen vacancy concentration, the hydrothermal Ce0.5Fe0.3Zr0.202 catalyst presented the lowest Ti (251℃, ignition temperature of soot oxidation) and Tm (310 ℃, maximum oxidation rate temperature) for soot combustion (with tight-contact between soot and catalysts) among the five samples. Even after aging at 800 ℃ for 10 h, the Ti and Tm were still relatively low, at 273 and 361 ℃, respectively, indicating high catalytic stability. 展开更多
关键词 Ce0.5Fe0.30Zr0.20O2 mixed oxides soot combustion solid solution interaction hydrothermal method rare earths
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Preparation of Mesoporous Ce0.5Zr0.5O_2 Mixed Oxide by Hydrothermal Templating Method 认领 引用 被引量:3
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作者 古映莹 冯圣生 +2 位作者 李金林 顾向奎 王曼娟 《Journal of Rare Earths》 SCIE EI CAS 2007年第6期710-714,共5页
Mesoporous Ce0.5Zr0.5O2 mixed oxide with high specific surface area was synthesized under basic condition in the presence of non-ionic surfactant PEG-4000. The effect of synthesis conditions, such as synthesis tempera... Mesoporous Ce0.5Zr0.5O2 mixed oxide with high specific surface area was synthesized under basic condition in the presence of non-ionic surfactant PEG-4000. The effect of synthesis conditions, such as synthesis temperature and the molar ratio of PEG-4000/([ Ce] + [ Zr] ), on specific surface area were investigated. The products were characterized by transmission electron microscopy, powder X-ray diffraction, and nitrogen adsorption-desorption measurements, respectively. The results showed that synthesis temperature and the molar ratio of PEG-4000/([ Ce] + [ Zr] ) had great influence on specific surface area. Under the optimum synthesis conditions, the prepared Ce0.5Zr0.5O2 mixed oxide presented cubic fluorite-type structure and possessed high surface area of 148.6 m2·g^-1 with wormlike pores. 展开更多
关键词 mesoporous Ce0.5Zr0.5O2 mixed oxide PEG-4000 rare earths
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Characterization and Preparation of Ce-Zr-O Solid Solution 认领 引用 被引量:2
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作者 罗孟飞 周碧 +3 位作者 林瑞 陈敏 袁贤鑫 郑小明 《Journal of Rare Earths》 SCIE EI CAS 2000年第4期275-278,共4页
Ce Zr O solid solution was prepared by four different methods, i.e., decomposition of nitrate, coprecipiation, hydroxysuainic acid sol gel as well as citrate sol gel, and characterized by using X ray powder diffractio... Ce Zr O solid solution was prepared by four different methods, i.e., decomposition of nitrate, coprecipiation, hydroxysuainic acid sol gel as well as citrate sol gel, and characterized by using X ray powder diffraction, Raman and temperature programmed reduction. The phase composition and the reduction properties of Ce Zr O depend on the preparation method. A cubic Ce 0.5 Zr 0.5 O 2 solid solution can be obtained by using the sol gel method. The Ce Zr O solid solution prepared by using decomposition or coprecipiation was composed of cubic Ce 0.8 Zr 0.2 O 2 and tetragonal Ce 0.2 Zr 0.8 O 2 solid solution. The Ce Zr O solid solution prepared with different methods shows the different reduction properties owing to different phase composition. Results of differential thermal analysis and XRD show that Ce 0.5 Zr 0.5 O 2 solid solution is formed during the decomposition or combustion of the gel. 展开更多
关键词 rare earths Ce 0.5 Zr 0.5 O 2 solid solution X ray powder diffraction Raman temperature programmed reduction
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CuO在Ce0.5Zr0.5O_2上的分散状态及其CO氧化性能的研究 认领 引用 被引量:4
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作者 蒋晓原 周仁贤 +2 位作者 陈煜 楼莉萍 郑小明 《浙江大学学报(理学版)》 CAS 2001年第6期653-658,共6页
以硝酸铈和硝酸锆为原料 ,采用共沉淀法制备了不同摩尔比 (0 ,0 .1,0 .2~ 0 .9,1.0 )的Cem Zr1-m O2 样品 .并以 Ce0 .5Zr0 .5O2 为载体 ,采用浸渍法负载不同含量的 Cu O,在色谱流动法上考察其对CO的氧化活性 .并用 XRD,TPR和 BET等技... 以硝酸铈和硝酸锆为原料 ,采用共沉淀法制备了不同摩尔比 (0 ,0 .1,0 .2~ 0 .9,1.0 )的Cem Zr1-m O2 样品 .并以 Ce0 .5Zr0 .5O2 为载体 ,采用浸渍法负载不同含量的 Cu O,在色谱流动法上考察其对CO的氧化活性 .并用 XRD,TPR和 BET等技术对 Cu O/ Ce0 .5Zr0 .5O2 各样品进行了表征 .结果表明 ,当Cu O负载量为 5 .0 %时 ,其 CO的氧化活性最高 .XRD测定表明其氧化活性的高低与铜物种在 Ce0 .5Zr0 .5O2 上的分散状态有关 .TPR结果亦显示活性的高低与 Ce0 .5Zr0 .5O2 上分散较好的铜物种的 α还原峰及分散较差的γ还原峰的峰温及形状有关 . 展开更多
关键词 Ce-mZr1-mO2复合氧化物 CuO/ Ce0.5Zr0.5O2催化剂 分散状态 CO氧化活性
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铈锆固溶体的水热晶化及抛光性能 认领 引用 被引量:2
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作者 周新木 徐招弟 +3 位作者 李永绣 辜子英 胡平贵 彭德院 《南昌大学学报(理科版)》 CAS 北大核心 2006年第2期162-165,共4页
以混合氢氧化物固体粉末为前驱体,在一定水热处理温度和时间条件下制备了纳米级的CexZr1-xO2固溶体。XRD分析表明:焙烧前后的固溶体均与面心立方的CeO2的特征峰相符合,说明固溶体属于立方晶系;TEM分析表明:600℃焙烧后的粉体与焙烧前相... 以混合氢氧化物固体粉末为前驱体,在一定水热处理温度和时间条件下制备了纳米级的CexZr1-xO2固溶体。XRD分析表明:焙烧前后的固溶体均与面心立方的CeO2的特征峰相符合,说明固溶体属于立方晶系;TEM分析表明:600℃焙烧后的粉体与焙烧前相比,晶界明显,晶型呈立方形;在一定水热处理时间条件下,不同的处理温度对样品的失重率影响较大,在180℃以下时,前驱体晶化不完全,且出现单斜相和四方相的ZrO2,这为水热法制备CexZr1-xO2固溶体的晶化机理研究提供一定的借鉴。经800℃焙烧1.5 h的粉体对光学玻璃有较好的抛光性能。相对高温制备样品其焙烧温度低200℃以上,并省去了后期处理过程。 展开更多
关键词 Ce0.5Zr0.5O2 固溶体 水热晶化 抛光性能
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Fabrication and Magnetic Properties of Composite Ni0.5Zn0.5Fe_2O_4/Pb(Zr0.52Ti0.48)O_3 Nanofibers by Electrospinning 认领 引用 被引量:1
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作者 SHEN Xiangqian ZHENG Jincai +1 位作者 MENG Xianfeng LlANG Qingrong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第3期384-387,共4页
One-dimensional and quasi-one-dimensional nanostructure materials are promising building blocks for electromagnetic devices and nanosystems.In this work,the composite Ni0.5Zn0.5Fe2O4(NZFO)/Pb(Zr0.52Ti0.48)O3(PZT)nanof... One-dimensional and quasi-one-dimensional nanostructure materials are promising building blocks for electromagnetic devices and nanosystems.In this work,the composite Ni0.5Zn0.5Fe2O4(NZFO)/Pb(Zr0.52Ti0.48)O3(PZT)nanofibers with average diameters about 65 nm are prepared by electrospinning from poly(vinyl pyrrolidone)(PVP)and metal salts.The precursor composite NZFO/PZT/PVP nanofibers and the subsequent calcined NZFO/PZT nanofibers are investigated by Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),scanning electron microscopy(SEM).The magnetic properties for nanofibers are measured by vibrating sample magnetometer(VSM).The NZFO/PZT nanofibers obtained at calcination temperature of 900°C for 2 h consist of the ferromagnetic spinel NZFO and ferroelectric perovskite PZT phases,which are constructed from about 37 nm NZFO and 17 nm PZT grains.The saturation magnetization of these NZFO/PZT nanofibers increases with increasing calcination temperature and contents of NZFO in the composite. 展开更多
关键词 nanofiber Ni0.5Zn0.5Fe2O4 Pb(Zr0.52Ti0.48)O3 composite electrospinning
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贫燃条件Ag-Rh/CeO_2-ZrO_2-Al_2O_3协同催化C_3H_6选择性还原NO的原位红外研究 认领 引用 被引量:1
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作者 张栖 刘有发 +5 位作者 钟标城 付名利 吴军良 黄碧纯 梁红 叶代启 《环境科学学报》 CAS 北大核心 2010年第10期2022-2029,共8页
将Ag-Rh浸渍到共沉淀法合成的Ce-Zr-Al上,制备出Ag(0.04)-Rh(x)/Ce0.5Zr0.5O2-75%Al2O3系列催化剂,采用BET比表面积、X射线衍射光谱(XRD)和原位漫反射傅里叶变换红外光谱(DRIFTS)对催化剂进行表征,并探讨催化剂在贫燃条件下选择性还原N... 将Ag-Rh浸渍到共沉淀法合成的Ce-Zr-Al上,制备出Ag(0.04)-Rh(x)/Ce0.5Zr0.5O2-75%Al2O3系列催化剂,采用BET比表面积、X射线衍射光谱(XRD)和原位漫反射傅里叶变换红外光谱(DRIFTS)对催化剂进行表征,并探讨催化剂在贫燃条件下选择性还原NO的活性和反应机理.结果表明,Ag-Rh双组分催化剂的活性较单组分Ag、Rh催化剂的高.Rh负载量为0.7%(质量分数)时,NO转化率达最佳(90.3%),且反应的起燃温度低、活性温度范围宽(300~500℃).DRIFTS结果显示,Rh的添加不仅有利于催化剂表面NO的吸附,而且能促进Ag催化生成关键反应中间体—CO—NH—,进而显著提高NO的转化率. 展开更多
关键词 贫燃条件 Ag-Rh/Ce0.5Zr0.5O2-75%Al2O3催化剂 NO C3H6 原位漫反射傅里叶变换红外光谱
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制备方法对(Ce0.6Zr0.4O_2)0.5(Al_2O_3)0.5储氧材料性能的影响 认领 引用 被引量:1
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作者 田久英 卢菊生 +1 位作者 吴宏 沐来龙 《稀土》 CAS CSCD 北大核心 2012年第4期23-28,共6页
分别利用氨水共沉淀法和柠檬酸溶胶-凝胶法制备稀土储氧材料(Ce0.6Zr0.4O2)0.5(Al2O3)0.5,并用XRD、BET、H2-TPR、SEM和EDX等手段研究制备方法对(Ce0.6Zr0.4O2)0.5(Al2O3)0.5的晶相结构、比表面积、平均孔径、孔容、储氧性能、还原性能... 分别利用氨水共沉淀法和柠檬酸溶胶-凝胶法制备稀土储氧材料(Ce0.6Zr0.4O2)0.5(Al2O3)0.5,并用XRD、BET、H2-TPR、SEM和EDX等手段研究制备方法对(Ce0.6Zr0.4O2)0.5(Al2O3)0.5的晶相结构、比表面积、平均孔径、孔容、储氧性能、还原性能、样品各组分含量以及颗粒形貌的影响。结果表明两种方法制备样品均为立方晶相的CeO2-ZrO2-Al2O3固溶体,无Al2O3的晶相。但与氨水共沉淀法比较,柠檬酸溶胶-凝胶法制备样品的比表面积、孔容较大,储氧性、还原性和热稳定性能较高。SEM和EDX测试结果表明,氨水共沉淀法制备样品有明显的聚集现象,而柠檬酸溶胶-凝胶法制备样品的颗粒粒径小,分布均匀,且原子组成更接近理论值。 展开更多
关键词 制备方法 (Ce0.6Zr0.4O2)0.5(Al2O3)0.5 储氧材料 氨水共沉淀法 柠檬酸溶胶-凝胶法
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LiMn2O4与Li1.5Al0.5Ge1.5(PO4)3/Li7La3Zr2O12的复合正极材料制备及性能研究 认领 引用 被引量:1
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作者 蓝凌霄 吴秋满 +2 位作者 王云婷 吴希 梁兴华 《装备制造技术》 2019年第5期57-60,共4页
正极材料在锂离子电池服役过程中的电化学稳定性是目前研究的热点之一,研究锰酸锂复合正极材料,探索改善正极材料电化学稳定性的工艺与方法。采用高温固相法制备LiMn2O4和NISICON结构的Li1.5Al0.5Ge1.5(PO4)3、石榴石结构的Li7La3Zr2O12... 正极材料在锂离子电池服役过程中的电化学稳定性是目前研究的热点之一,研究锰酸锂复合正极材料,探索改善正极材料电化学稳定性的工艺与方法。采用高温固相法制备LiMn2O4和NISICON结构的Li1.5Al0.5Ge1.5(PO4)3、石榴石结构的Li7La3Zr2O12,将LiMn2O4和Li1.5Al0.5Ge1.5(PO4)3/Li7La3Zr2O12以9∶1的比例混合制备复合正极材料。利用X射线衍射仪分析其物理性能,组装成扣式电池,通过恒流充放电测试、循环伏安测试、阻抗测试等进行电化学性能分析。结果表明,LiMn2O4/Li1.5Al0.5Ge1.5(PO4)3复合正极材料和LiMn2O4/Li7La3Zr2O12复合正极材料依然为尖晶石结构,材料结晶度良好。其中,LiMn2O4/Li1.5Al0.5Ge1.5(PO4)3复合正极材料衍射峰相对尖锐,峰强较大。充放电测试表明,LiMn2O4/Li1.5Al0.5Ge1.5(PO4)3复合正极材料的放电比容量比LiMn2O4/Li7La3Zr2O12复合正极材料的放电比容量高,化学反应的可逆性更佳。所以,LiMn2O4/Li1.5Al0.5Ge1.5(PO4)3复合正极材料的性能优于LiMn2O4/Li7La3Zr2O12复合正极材料。 展开更多
关键词 LiMn2O4 Li1.5Al0.5Ge1.5(PO4)3 Li7La3Zr2O12 复合正极材料 电化学性能
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CuO/m-Ce0.5Zr0.5O_2催化剂和富氢条件下CO氧化性能的研究 认领 引用
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作者 滕美玲 罗来涛 陈祎 《稀土》 CAS 北大核心 2009年第5期39-43,共5页
采用多元醇法合成了介孔Ce0.5Zr0.5O2(m-Ce0.5Zr0.5O2)复合氧化物,研究了m-Ce0.5Zr0.5O2和焙烧温度对Cu基催化剂富氢条件下CO氧化性能的影响,并运用XRD、TPR、TPD、比表面和孔径测定等技术对载体及催化剂进行了表征。结果表明,多元醇法... 采用多元醇法合成了介孔Ce0.5Zr0.5O2(m-Ce0.5Zr0.5O2)复合氧化物,研究了m-Ce0.5Zr0.5O2和焙烧温度对Cu基催化剂富氢条件下CO氧化性能的影响,并运用XRD、TPR、TPD、比表面和孔径测定等技术对载体及催化剂进行了表征。结果表明,多元醇法合成的m-Ce0.5Zr0.5O2具有较大比表面积和均一的立方萤石结构。与CuO/Ce0.5Zr0.5O2催化剂相比,CuO/m-Ce0.5Zr0.5O2催化剂具有较好的催化活性,归因于该催化剂具有较大的比表面积和高分散的CuO。焙烧温度对CuO/m-Ce0.5Zr0.5O2催化剂的性能有较大的影响,其中以673K焙烧所制备的催化剂活性最好。 展开更多
关键词 多元醇法 介孔Ce0.5Zr0.5O2 CuO催化剂 CO氧化
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Hf0.5Zr0.5O2超薄薄膜铁电性及其晶相演变 认领 引用
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作者 何业法 徐华义 +2 位作者 邬海龙 周海芳 赖云锋 《福州大学学报(自然科学版)》 CAS 北大核心 2022年第5期616-620,共5页
制备不同厚度的Hf0.5Zr0.5O2(HZO)薄膜,并使用不同退火温度对其进行热处理.在最优热处理条件下,所制备薄膜的两倍剩余极化强度可达约40μC·cm-2,矫顽场强低至约±1.15 MV·cm-1,其响应速度明显优于传统铁... 制备不同厚度的Hf0.5Zr0.5O2(HZO)薄膜,并使用不同退火温度对其进行热处理.在最优热处理条件下,所制备薄膜的两倍剩余极化强度可达约40μC·cm-2,矫顽场强低至约±1.15 MV·cm-1,其响应速度明显优于传统铁电材料.结果表明,HZO薄膜正交相与其铁电性有较大关系,过高的退火温度会导致四方相向单斜相转变,从而降低其铁电性.实验所得结果可为高性能HZO铁电器件的研究与制备提供一定参考. 展开更多
关键词 铪锆氧 铁电薄膜 剩余极化强度 退火温度 正交相
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Effects of Carrier on CuO/TiO_2 and CuO/Ti0.5Zr0.5O_2 Catalysts in the NO+CO Reaction 认领 引用 被引量:1
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作者 GuangHuiDING XiaoYuanJIANG XiaoMingZHENG 《Chinese Chemical Letters》 SCIE CAS 2005年第2期275-278,共4页
Using TiO2 and Ti0.5Zr0.5O2 as carriers, the CuO/TiO2 and CuO/Ti0.5Zr0.5O2 catalystswere prepared by the impregnation method with Cu(NO3)2 as active component. The catalyticactivities in NO+CO reaction were investigat... Using TiO2 and Ti0.5Zr0.5O2 as carriers, the CuO/TiO2 and CuO/Ti0.5Zr0.5O2 catalystswere prepared by the impregnation method with Cu(NO3)2 as active component. The catalyticactivities in NO+CO reaction were investigated using a microreactor-GC system, and structure andreducibility of catalysts were characterized by means of physical adsorption, TPR, XRD, NO-TPDtechnologies. It was found that the activity of CuO/Ti0.5Zr0.5O2 catalyst was higher than that ofCuO/TiO2, probably due to the large specific surface area of Ti0.5Zr0.5O2 that played an importantrole in NO+CO reaction. 展开更多
关键词 Ti0.5Zr0.5O2 solid solution supported CuO catalysts NO+CO reaction.
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