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La_(0.67)Sr_(0.33)MnO_(3)薄膜相图的轨道弹性调控

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Science China Materials 2024年第2期67卷 619-628页

作者：高昂张庆华刘倬卉孟繁琦尚彤彤尼浩黄河意杜剑宇李欣岩于搏涛苏东金奎娟葛琛吉彦舟王博余倩张泽陈龙庆谷林南策文 Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China State Key of Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China College of Science China University of Petroleum(East China)Qingdao 266580China Materials Research Institute and Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802 USA School of Materials Science and Engineering Zhejiang UniversityHangzhou 312227China

过渡金属氧化物具有丰富的功能性,但其错综复杂的内部自由度对相图绘制和结构设计提出了挑战.本文中,我们引入了描述相图物理起源的轨道能级序(ELO),并通过对La_(0.67)Sr_(0.33)MnO_(3)(LSMO)氧化物的研究证明了其在相图预测中的有效性... 详细信息

过渡金属氧化物具有丰富的功能性,但其错综复杂的内部自由度对相图绘制和结构设计提出了挑战.本文中,我们引入了描述相图物理起源的轨道能级序(ELO),并通过对La_(0.67)Sr_(0.33)MnO_(3)(LSMO)氧化物的研究证明了其在相图预测中的有效性.结合DFT计算和实验,我们构建了氧含量和应变关联的LSMO相图,结果表明LSMO结构稳定性与ELO密切相关.据此发现了一种由ELO演化而产生的四倍氧有序相.最后,我们提出了描述轨道分裂程度的轨道弹性定律,阐明了ELO演化的起源,助力功能氧化物的设计.这项研究拓宽了材料科学领域的性能调控手段,并为从轨道角度预测相图提供了思路.

关键词： phase diagram orbital energy level orbital elasticity law structural design La_(0.67)Sr_(0.33)MnO_(3)films

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碳化硅(SiC)基材料的高温氧化和腐蚀

腐蚀科学与防护技术 2000年第2期12卷 109-113页

作者：潘牧南策文武汉工业大学材料复合新技术国家重点实验室武汉430070

评述了近年来SiC材料氧化和腐蚀研究的进展 ,分析讨论SiC腐蚀氧化机理、影响因素、气氛和融盐等的影响 ,比较了SiC材料在不同条件下的氧化腐蚀情况 ,同时指出了存在的问题 .

关键词：碳化硅氧化腐蚀

Magnetic and Photocatalytic Behaviors of Ca Mn Co-Doped BiFeO<sub>3</sub>nanofibres

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Modern Research in Catalysis 2013年第3期2卷 1-5页

作者： Yannan Feng Huanchun Wang Yang Shen Yuanhua Lin cewen nan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing China

Ca and Mn co-doped BiFeO3 ultrafine nanofibres were prepared with the purpose of improving magnetic and photocatalytic performances of the one-dimensional multiferroic material. Impurity phase introduced by both Bi fluctuation and Mn substitution can be suppressed by Ca doping and a space group transition from R3c to C222 can also be triggered by Bi-site doping. With co-substitution of Mn into iron site, the Ca0.15Bi0.85Mn0.05Fe0.95O3 nanofibres presented a larger saturation magnetization than the singly Ca doping samples, possibly due to the increased double exchange interation of Fe3+-O-Fe2+, strengthened by Ca and Mn. Photocatalytic degradation test witnessed a similar drop-and-rise performance with the magnetism.

关键词： Bismuth Ferrite nanofibre Magnetic Photocatalytic

Anisotropy of Photocatalytic Properties in nanostructured Photocatalysts

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Soft nanoscience Letters 2016年第2期6卷 11-30页

作者： Huanchun Wang Lina Qiao Haomin Xu Yuanhua Lin Yang Shen cewen nan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing China High-Tech Institute of Xi’an Xi’an China

Energy band engineering and the nature of surface/interface of a semiconductor play a significant role in searching high efficiency photocatalysts. Actually, the active facets, morphology controlling, especially the exposed facets modulation of photocatalysts during preparation are very desirable. In order to achieve high photocatalytic performance, intrinsic mechanism of such anisotropic properties should be fully considered. In this review, we mainly emphasis on the latest research developments of several extensively investigated photocatalysts and their anisotropic photocatalytic properties, as well as the correlation between effective masses anisotropy and photocatalytic properties. It will be helpful to understand the photocatalytic mechanism and promote rational development of photocatalyst for wide applications.

关键词： Anisotropy Carriers Effective Mass Photocatalytic Properties

SiC基材的抗氧化腐蚀涂层的研究现状与方向

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材料保护 1999年第10期32卷 1-3页

作者：潘牧南策文武汉工业大学材料复合新技术国家重点实验室 430070

总结了近年来ＳｉＣ基材的抗氧化腐蚀涂层的研究现状，讨论了影响涂层热震性能和抗氧化腐蚀性能的因素，提出了等离子喷涂层中的亚稳结构在服役过程中向热力学稳定结构转变产生的相变应力是影响涂层热震性能的关键因素。涂层的抗热震... 详细信息

总结了近年来ＳｉＣ基材的抗氧化腐蚀涂层的研究现状，讨论了影响涂层热震性能和抗氧化腐蚀性能的因素，提出了等离子喷涂层中的亚稳结构在服役过程中向热力学稳定结构转变产生的相变应力是影响涂层热震性能的关键因素。涂层的抗热震性能直接关系到涂层对氧化腐蚀环境的防护作用，展望了该领域内的研究方向。

关键词：涂层氧化腐蚀碳化硅耐蚀材料

Dielectric and varistor properties of rare-earth-doped ZnO and CaCu_(3)Ti_(4)O_(12) composite ceramics

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Journal of Advanced Dielectrics 2013年第1期3卷 19-22页

作者： Huafei Lu Yuanhua Lin Jiancong Yuan cewen nan Kexin Chen State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084P.R.China

To investigate the multi-functional ceramics with both high permitivity and large nonlinear cofficient,we have prepared rare-earth Tb-and-Co doped ZnO and TO_(2)rich CaCu_(3)Ti_(4)O_(12)(TCCTO)powders by chemical co-precipitation and sol-gel methods re-spectively,and then obtained the TCCTO/ZnO composite ceramics,sintered at 1100℃for 3h in *** the composite ceramics of the microstructure and phase composition indicated that the composite ceramics were composed of the main phases of ZnO and CaCu_(3)Ti_(4)O_(12)(CCTO).Our results revealed that the TCCTO/ZnO composite ceramics showed both high dielectric and good nonlinear electrical *** composite ceramic of TCCTO:ZnO=0.3 exhibited a high dielectric constant of~210(1 kHz)with a nonlinear cofficient of~*** dielectric behavior of TCCTO/ZnO composite could be explained by the mixture *** the high dielectric permittivity and tunable varistor behaviors,the composite ceramics has a potential application for the higher voltage transportation devices.

关键词： Varistors CCTO nonlinear coefficient dielectrics

FORMATION OF AIN WHISKERS BY NITRIDATION OF AI/AIN POWDERS

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Journal of Wuhan University of Technology(Materials Science) 1997年第4期12卷 53-57页

作者：戴英

The aluminum nitride whiskers were synthesized by the nitridation of Al/AlN powders in a flowing nitrogen atmosphere. The whiskers were about 0. 5祄 in diameter and 10~20祄 in length, and they were straight and had smooth surfaces. The morphology of the whiskers were studied by means of SEM and TEM. The AlN whiskers were grown via vapor-solid (VS) mechanism.

关键词： AlN whiskers VS growth mechanism Nitri-dation

镍酸镧界面层对锆钛酸铅膜–钴铁氧体陶瓷复合磁电材料性能的影响

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硅酸盐学报 2013年第10期41卷 1313-1317,1322页

作者：王婧李峥沈洋林元华南策文清华大学核能与新能源技术研究院清华大学材料学院新型陶瓷与精细工艺国家重点实验室北京100084

以化学溶液沉积法制得的LaNiO3薄膜作为Pb(Zr0.52Ti0.48)O3膜-CoFe2O4陶瓷复合材料的导电界面层,利用其优良的导电性保证磁电信号的有效输出。LaNiO3界面层的引入,使得复合材料体系的铁电性能、压电性能得到有效表达,其层面内磁电耦合... 详细信息

以化学溶液沉积法制得的LaNiO3薄膜作为Pb(Zr0.52Ti0.48)O3膜-CoFe2O4陶瓷复合材料的导电界面层,利用其优良的导电性保证磁电信号的有效输出。LaNiO3界面层的引入,使得复合材料体系的铁电性能、压电性能得到有效表达,其层面内磁电耦合系数达到58mV/(cm Oe)。继续优化制备工艺及界面层的参数,磁电耦合性能将进一步提高。

关键词：磁电复合材料金属氧化物化学溶液沉积法多铁性

Fabrication of Inorganic–Organic Composites for Dental Restorative Materials—A Review

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Journal of the Chinese Ceramic Society 2015年第4期 179-197页

作者： CUI Bencang YANG Qing LI Jing WANG Huining LIN Yuanhua SHEN Yang LI Ming DENG Xuliang nan cewen State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University Department of Periodontics Hospital of StomatologyWenzhou Medical University Peking University School and Hospital of Stomatology

The paper is to review recent developments on composite dental restorative materials in terms of filler dimensions. The mechanical properties, biocompatibility and aesthetic performance are determined by fillers morphology, contents and chemical composition. We mainly summarized the 0-, 1-, and 2-dimensional fillers of composites used in dental restoration and their effects on the performance, especially the mechanical properties, which imply desirable applications for dental composites designed with these fillers.

关键词： composites dental restorative materials inorganic fillers mechanical properties