Chunyan BAN
,
Wenqing GAO
,
Guiyi ZENG
,
Qixian BA
,
Hualin ZENG
材料科学技术（英文）
The magnetic properties of Fe72.5Cu1Nb2V2Si13.5B9 alloy are investigated from an amorphous to a nanocrystalline and complete crystalline state. The sample annealed at 550℃ for 0.5 h shows a homogeneous nanocrystalline structure and presents excellent soft magnetic properties. When the specimens were annealed at a temperature above 600℃, the magnetic properties are obviously deteriorated because the grain size grows up, exceeding the exchange length.
关键词:
Fe72.5Cu1Nb2V2Si13.5B9 alloy
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null
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null
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null
王建生
,
韩其勇
,
魏寿昆
,
宋波
金属学报
应用Ba蒸气平衡法,在密封Mo反应室内,用自制的TiN和BaS坩埚,进行了纯Fe液中Ba—O,Ba—S,Ba—P平衡的研究。得到反应:BaO_(s)=[Ba]+[O]的标准自由能ΔG°_(wt-％)=188500+38.3T J/mol,e_O~(Ba)=624-1.25×10~6/TBaS_(S)=[Ba]+[S]的标准自由能ΔG°_(wt-％)=469100-111T J/mol,e_S~(Ba)=826-1.64×10~6/T1873K下,反应Ba_3P_2=3[Ba]+2[P]的K_(Ba_3P_2)=7.76×10~(-18),e_(Ba)~P=0.95,ΔG°_(wt-％)=613200 J/mol。
关键词:
Ba
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O
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S
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P
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liquid iron
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thermodynamic parameters
YUE Kexiang DONG Yuanchi East China Institute of Metallurgy
,
Ma'anshan
,
China
金属学报(英文版)
The equilibrium constants between Sr-O,Ba-O and Sr-S,Ba-S in liquid iron at 1570℃ and the interaction coefficients concerning these elements have been determined as follows: K_(Sro)=1.897×10~(-7),e_O~(Sr)=-43.8 K_(BaO)=8.204×10~(-8),e_O~(Ba)=-98.0 K_(SrS)=8.356×10~(-7),e_S~(Sr)=-3.9 K_(BaS)=4.083×10~(-7),e_S~(Ba)=-3.5
关键词:
equilibrium
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null
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null
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null
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null
王一德
,
任建新
,
王立新
钢铁
概述了我国不锈钢光亮(BA)板的开发,介绍了BA板的生产工艺及主要设备,并对市场及其今后发展进行了简要分析.
关键词:
BA板
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开发
Surface Review and Letters
Adsorption and diffusion of a Ba adatom on a reconstructed Si(001) surface were studied using first principles density functional calculation. It was found that the lowest energetic configuration is that the Ba atom resides at the T3' (which is displaced along the [(1) over bar 10] direction from the T3 site by similar to 0.26 angstrom). An anisotropic diffusivity of Ba on the reconstructed surface was found. The preferred direction of diffusion was the trough between Si dimer rows.
关键词:
first principles;Ba;Si(001) surface;adsorption;x-1 surface;exchange;phase;leed;wave
赵季若
,
张凯琳
,
冯莺
,
张学健
,
秦齐富
高分子材料科学与工程
采用气-固相搅拌式方法,氯气作为引发剂,在加热的情况下合成了聚氯乙烯(PVC)、丙烯酸丁酯(BA)的氯化原位接枝共聚产物(CPVC-g-BA).用IR、1H-RNM等分析手段研究了PVC氯化原位接枝BA反应的可行性,以GPC等数据讨论了接枝共聚物的结构,并考察了反应温度、反应时间、单体用量对产物接枝率的影响:当加入20份BA,反应温度为120℃时,反应100min,接枝率达1.07%.
关键词:
氯化原位接枝共聚
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聚氯乙烯
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丙烯酸丁酯
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分子结构
杨子义
,
郝正同
,
谢泉
材料导报
采用磁控溅射法在Si(111)衬底上沉积了Ba单层膜,研究了退火温度对Ba-Si化合物生成的影响.X射线衍射表明,在真空中退火12h后出现了Ba3Si4(202)和Ba3Si4(221)衍射峰,表现出择优取向,700℃是理想的退火温度.采用第一性原理对Ba3Si4的能带结构和态密度进行了计算,结果表明它是一种金属,价带主要是由Si的3s、3p及Ba的5p、6s态电子构成,导带主要由Ba的5d及Si的3p态电子构成.
关键词:
Ba3Si4薄膜
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电子结构
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磁控溅射
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退火
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择优取向
Journal of Applied Physics
The crystal structure and superconducting properties of RuSr(2-x)Ba(x)GdCu(2)O(8) (0less than or equal toxless than or equal to0.1) have been investigated. X-ray powder diffraction (XRD) patterns show that the solid solution range is 0less than or equal toxless than or equal to0.1. The superconducting transition temperature was raised up to 35 K (zero) and 62 K (onset) for x=0.07, from 16 K (zero) and 45 K (onset) for x=0.0, and then T(C) decreases with x when x>0.07. Rietveld refinement for XRD data of RuSr(2-x)Ba(x)GdCu(2)O(8) show that the apical Cu-O(1) bond length increases with an increase of x, while the Ru-O(1) bond length decreases, This may account for the enhancement of the superconducting transition temperature. (C) 2004 American Institute of Physics.
关键词:
dc magnetization;rusr2gdcu2o8;ferromagnetism;coexistence;gd
