检索结果-南通市图书馆

STRUCTURE OF TERNARY COMPOUND LaNi2Si2

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 1985年第1期 27-29页

作者： liang jingkui and Zhao JingtaiInstitute of Physics, Academia Sinica

The LaNiSialloy was prepared in a water-cooled copper crucible in an are melting furnace With a non-self-consume W electrode under an argon atmosphere. The pure components （La, 99.5%; Ni, 99.9%; Si, 99.99%） were used as raw materials. The alloy bulk was hongenized. The fine powder sample was used for X-ray diffraction after annealed in an evacuated silica tube at 400℃ in order to eliminate stresses.

关键词： Ni La Si STRUCTURE OF TERNARY COMPOUND LaNi2Si2

CRYSTAL STRUCTURE AND SUPERCONDUCTIVITY OF Ba_(2)YCu_(3)O_(9-x) COMPOUND

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1987年第10期4卷 453-456页

作者： CHE Guangcan liang jingkui CHEN Wei XIE Sishen YANG Qiansheng CHEN Genghua NI Youngming LIU Guirong Institute of Physics Academia SinicaBeijing

The crystal structure and superconductivity of the compound Ba_(2)YCu_(3)O_(9-x) are orted in this *** compound has an orthorhombic distorted perovskite structure cell with a=3.892Å,b=3.824Åand c=11.64Å.The temperatur... 详细信息

关键词： compound distorted perovskite

稀土富过渡族金属化合物的形成条件、晶体结构和磁性能(Ⅱ)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国稀土学报 2012年第4期30卷 513-524页

作者：骆军梁敬魁饶光辉北京凝聚态物理国家实验室(筹) 中国科学院物理研究所北京100190

稀土(R)富过渡族金属(T)化合物是探索新型稀土永磁材料的主要研究对象,其磁性能与晶体结构密切相关。本文系统综述了我们近年来针对二元化合物不存在的情况下,通过第三组元M的稳定作用,合成和稳定具有CaCu5型衍生结构的化合物Rm-nT5m+2n... 详细信息

稀土(R)富过渡族金属(T)化合物是探索新型稀土永磁材料的主要研究对象,其磁性能与晶体结构密切相关。本文系统综述了我们近年来针对二元化合物不存在的情况下,通过第三组元M的稳定作用,合成和稳定具有CaCu5型衍生结构的化合物Rm-nT5m+2n(包括R(T,M)7,R2(T,M)17,R3(T,M)29和R(T,M)12),具有NaZn13型结构的化合物R(T,M)13,以及m层RT5和n层RT3B2组合的化合物Rm+nT5m+3nB2n等方面的主要研究结果。重点讨论了这些化合物的晶体结构、形成条件和磁性能,阐述了加入M对化合物的稳定作用机制,及M的晶体学占位对磁性能的影响。研究结果表明:M的加入不仅能够起到稳定化合物的作用,往往还可以显著改善化合物的磁性能。

关键词：稀土富过渡族金属化合物晶体结构相稳定磁性能

维普期刊数据库

同方期刊数据库

Solid Solution Sm_(1+x)Ba_(2-x)Cu_3O_y and Effect of Quench Temperature on SmBa_2Cu_3O_y

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1994年第4期10卷 269-272页

作者： Xianran XING Zhiyu QIAO Wenxia YUAN and Shoukun WEI (University of Science and Technology Beijing, Beijing, 100083, China)(To whom correspondence should be addressed)Xiaolong CHEN, Guanghui RAO and jingkui liang (Institute of Physics, Chinese Academy o Univ of Science and Technology Beijing China

By X-ray powder diffraction technique and oxygen content analysis, a solid solution Sm1+xBa2-xCu3Oy has been determined in the range 0≤x≤0.4. When x<0.25. the Sm1+xBa2-xCu3Oy presents orthorhombic symmetry, and the orthorhombic-tetragonaJ transition ocCurs at x = 0.25. With the increase of x, TC decreases and finally breaks. The correlation between ox ygen content and phase structure at different quench temperatures related to Sm Ba2Cu3Oy has been investigated as well

关键词： x)Ba x)Cu3Oy and Effect of Quench Temperature on SmBa2Cu3Oy Cu Solid Solution Sm

维普期刊数据库

PHASE EQUILIBRIA IN LaNi5-xGax（x≤4） SYSTEM AND THEIR HYDROGEN ABSORPTION PROPERTIES

在线全文

学校读者我要写书评

暂无评论

A Monthly Journal of Science 1984年第1期 29-34页

作者：解思深梁敬魁 Institute of Physics Academia Sinica Beijing

Compounds of the type RM5 （R is rare earth element, M transition metal） as hydrogen absorption materials have aroused enormous interest. Now, the majority of research work in this field is focused on the new types of hydrogen absorption materials, the improvement of the existing materials’ properties and on the investigation of the absorption mechanism.

关键词： PHASE EQUILIBRIA IN LaNi SYSTEM AND THEIR HYDROGEN ABSORPTION PROPERTIES x)Ga_x Ga

THE STRUCTURE OF NiGa4 CRYSTAL——A NEW VACANCY CONTROLLED y-BRASS PHASE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science in China,Ser.A 1983年第12期 1305-1313页

作者：梁敬魁解思深 Institute of Physics Academia Sinica Beijing

The strueture of NiGa4 crystal has been determined by means of X-ray powder diffraction method. NiGa4 crystal belongs to body-centered cubic system with space group T3-I23. The lattice parameter at room temperature is a=8.4295. There are 8 formula weights per unit cell. The equivalent positions and atomic parameters occupied by 8Ni and 32Ga atoms are as follows:8Ni occupy 8（c） position, x（Ni）=0.3345,8Ga（1） occupy 8（c） position, x: （Ga.）=0.1668,12Ga（2） occupy 12（d） position, x2（Ga）=0.3524,12Ga（3） occupy 12（e） position, x3（Ga）=*** real composition of NiGa4 alloy phase deviates from ideal stoichiometric formula to the rich Ni side. NiGa4 crystal structure is a new deformation γ-brass structure controlled by vacancies in crystal. It is discussed that the average valence-electronic number perfundamental structure unit is an important factor controlling γ-brass structure.

关键词： THE STRUCTURE OF NiGa4 CRYSTAL A NEW VACANCY CONTROLLED y-BRASS PHASE Ga Ni

PARTIAL PHASE DIAGRAM OF Ti-Mn BINARY SYSTEM AND ITS RELATION WITH CHARACTERISTICS OF HYDROGEN STORAGE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1987年第20期32卷 1378-1381页

作者：梁敬魁饶光辉 Institute of Physics Academia Sinica Beijing

Hydrogen energy is an ideal secondary source of energy. With the development and use of hydrogen energy, more and more attention is paid to the studies on the materials for storage of hydrogen. Ti-Mn alloy is considered to be one of the most potential materials for storage of hydrogen. Gamo et al. studied systematically the characteristics of hydrogen storage of Laves phase in the Ti-Mn system. They indicated that the most sui-

关键词： systematically RELATION annealing melting manganese consuming annealed heating camera substitution

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

粉末衍射图形拟合修正晶体结构

结构化学 1985年第4期 241-260页

作者：梁敬魁中国科学院物理研究所中国科学院福建物质结构研究所

本文根据文献的有关资料,综述了粉末衍射图形拟合修正晶体结构的方法。介绍了这一方法的基本理论与所用的衍射线的峰形函数、线宽函数和择优取向修正函数;叙述了中子衍射和X射线衍射的不同实验方法,并比较其优缺点;讨论了这一方法的应... 详细信息

本文根据文献的有关资料,综述了粉末衍射图形拟合修正晶体结构的方法。介绍了这一方法的基本理论与所用的衍射线的峰形函数、线宽函数和择优取向修正函数;叙述了中子衍射和X射线衍射的不同实验方法,并比较其优缺点;讨论了这一方法的应用范围和有关问题。

关键词：拟合数学分析晶体结构结晶构造固体结构衍射线衍射强度洛仑兹函数峰形衍射角绕射角半高宽射线衍射粉末衍射择优取向织构

THE Pr-Fe-B TERNARY SYSTEM

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science in China,Ser.A 1987年第6期 607-619页

作者：田静华黄毅英梁敬魁 Institute of Physics Academia Sinica Beijing

The Pr-Fe-B ternary system has been investigated by means of X-ray diffraction and differential thermal analysis. The room temperature section of this ternary system with B≤48 at.%, the Pr-Fe binary phase diagram, the vertical section of the Pr-Fe-B ternary system with 6 at.% of boron （Pr<60 at.%） and several vertical sections of pseudo-binary systems Fe—Pr2Fe14B—Pr, Pr2 Fe17—Pr2Fe14B—Pr2Fe7B6 and Fe-Pr2Fe7B6, which are related to the phase Pr2Fe14B, have been determined. The hard magnetic phase Pr2Fe14B is the product of peritectic reaction of L + γ- Fe Pr2Fe14B. It melts noncongruently at 1145℃ and the corresponding liquidus point is about 1298℃. Eutectic reactions between Pr2Fe14B and Pr, Pr2Fe14B and Pr2Fe17, and Pr2Fe14B and Pr2Fe7B6 take place at 676℃, 1085℃ and 1100℃ respectively.

关键词： Fe Pr Nd THE Pr-Fe-B TERNARY SYSTEM