材料期刊网

Principle and Process Window of Cerium Dioxide Thin Film Fabrication with Dual Plasma Deposition

L.P. Wang , B. Y Tang , X.B. Tian , YX.Leng , Q. YZhang , P.K.Chu

材料科学技术（英文）

Cerium dioxide, CeO2, is a potentially superior material in a myriad of areas, and many methods have been proposed to deposit single crystal CeO2 thin films. A novel fabrication technique utilizing dual plasma generated by metal vacuum arc (MEVVA) and radio frequency (RF) is discussed in this paper. We have recently conducted a systematic investigation to determine the optimal process window to deposit CeO2 thin films'on Si(100) substrates. The X-ray diffraction results show the existence of CeO2(100) in the as-deposited sample

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Capacitance of High-Voltage Coaxial Cable in Plasma Immersion Ion Implantation

X.B. Tian , L.P. Wang , D. T.K.Kwok , B. Y Tang , P.K.Chu

材料科学技术（英文）

Plasma immersion ion implantation (PIII) is an excellent technique for the surf see modification of complex-shaped components. Owing to pulsed operation mode of the high voltage and large slew rate, the capacitance on the high-voltage coaxial cable can be detrimental to the process and cannot be ignored. In fact, a significant portion of the rise-time/fall-time of the implantation voltage pulse and big initial current can be attributed to the coaxial cable.

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SNOEK-Ke-K■STER PEAK OF INTERNAL FRICTION IN Fe-P-N ALLOYS

Y.Y.Che , G. Y.Zeng , Y. C. Xu and J. W , Ji(College of Science , Northeastern University , Shenyang 110006 , China)

金属学报(英文版)

The internal friction and precipitate phases of the deformed Fe-P-N alloys have been investigated. It has been found that the ratio of depends on the content of P and the relation holds if the content of N is lower than 30wt.ppm and the content of P is lower than 640wt.ppm. It shows that the intercept K2 is related to the presence of the atomic pairs and clusters of P in the alloy matrix.

关键词: internal friction , null

关于K-p两体问题的相对论修正

王万章 , 张启仁 , 高春媛

原子核物理评论 doi:10.3969/j.issn.1007-4627.2005.04.033

从基本理论出发,导出并求解了含有相对论修正的K介子与质子的两体薛定谔方程.其解可看作有统计解释的波函数.计算了K p的散射长度,结果表明相对论效应是很明显的.

关键词: K-p系统 , 相对论修正 , 散射长度

Crystal structure and thermal properties of compound K(2)Zn(3)(P(2)O(7))(2)

Powder Diffraction

K(2)Zn(3)(P(2)O(7))(2) was synthesized by solid state reaction and its crystal structure was determined by ab initio method from powder X-ray diffraction (XRD) data. The title compound was determined to be orthorhombic with space group P2(1)2(1)2(1), Z=4, and lattice parameters a=12.901(8) angstrom, b=10.102(6) angstrom, and c=9.958(1) angstrom. Values of lattice parameters from 303 to 573 K were measured by temperature-dependent XRD. Thermal expansion coefficients alpha(0), lattice parameters, and cell volume at 0 K were determined to be alpha(0)(a)=1.62327X 10(-4)/K, a(0)=12.855(4) angstrom, alpha(0)(b) = 1.17921 X 10(-4)/K, b(0)=10.070(8) angstrom, alpha(0)(c)=2.62364X 10(-4)/K, c(0)=9.880(4) angstrom, and alpha(0)(V) = 6.599 X 10(-2) /K, V(0) = 1278.967(0) angstrom(3). The specific heat equation as a function of temperature was determined to be C(p)=0.77115 +0.00231 T-1241.60027T(-2)- 1.4133 X 10(-6)T(2) (J/K g), for temperatures from 198 to 710 K. The melting point estimated from the mu-DTA heating curve is 795 degrees C. (C) 2008 International Centre for Diffraction Data. [DOI: 10.1154/1.2992517]

关键词: K(2)Zn(3)(P(2)O(7))(2);structure determination;thermal expansion;coefficient;specific heat;powder-diffraction;refinement;zno

应力比对40CrMnSiMoVA钢P-da/dN-△k曲线 影响研究

李淑兰 , 杨玉芬

兵器材料科学与工程 doi:10.3969/j.issn.1004-244X.2008.03.016

在介绍40CrMnSiMoVA钢的力学性能和试验条件基础上,根据金属材料疲劳裂纹扩展的统计分析方法,求出Pa-N和P-da/dN-△k曲线,并对不同应力比条件下的试验数据进行可靠性分析和比较,探讨中值da/dN-△k曲线和99.9%可靠度dddN-△k曲线的变化规律.研究结果表明,P-da/dN-△k曲线与应力比有很强的相关性,随着应力比增强,裂纹扩展速率增加.当可靠度要求增加时,这种趋势更明显.根据研究结果,恰当地考虑40CrMnSiMoVA钢对于不同应力比的影响,便于进行概率断裂力学分析.

关键词: 断裂 , 40CrMnSiMOVA钢 , P-da/dN-△k曲线 , 应力比

KⅧ-TbLⅣ离子3s3p 3P1-3s2 1S0 的自旋禁戒跃迁

牟致栋 , 魏琦瑛

原子核物理评论 doi:10.3969/j.issn.1007-4627.2004.01.015

在对KⅧ-TbLⅣ离子3s3p 3P1能级结构的多组态相互作用理论HXR方法计算的基础上, 分析了各种效应对等电子序列离子能级结构的影响, 找出了能级沿等电子序列变化的规律性. 预测计算了K Ⅷ-Tb LⅣ离子3s3p 3P1的能级. 由此进一步计算了KⅧ-TbL Ⅳ离子自旋禁戒跃迁3s3p 3P1-3s2 1S0的谱线波长、振子强度和跃迁概率.

关键词: KⅧ-TbLⅣ离子 , 自旋禁戒跃迁 , 波长 , 振子强度和跃迁概率

La对Fe-P-N合金Snoek-Ke-K■ster峰的影响

戢景文 , 魏全金 , 张国福 , 赖祖涵 , 陈廷国

金属学报

研究了F? P—N合金加?对Snoek—Ke-Koster(SKK)峰的影响,发现与合金含La,P的原子浓度比(C_(La)/C_p)有关:对于C_(La)/C_p较大(例如4.56和2.6)的合金,La有明显增强SKK阻?效应:对于C_(La)/C_p=0.27的P过饱和合金,La对SKK峰无明显影响。

关键词: 内耗 , Snoek-Ke-Koster peak , Fe-P-La-N alloy

Phase relations and flux research for zinc oxide crystal growth in the ZnO-K(2)O-P(2)O(5) system

Journal of Alloys and Compounds

The subsolidus phase relations of the ternary system ZnO-K(2)O-P(2)O(5) were investigated by means of Xray diffraction (XRD). There are 7 binary compounds. 6 ternary compounds and 20 three-phase regions in this system. The phase diagram of the pseudo-binary system KZn(4)(PO(4))(3)-ZnO was also investigated by means of XRD and differential thermal analysis (DTA) methods. KZn(4)(PO(4))(3)-ZnO is a eutectic system with eutectic temperature about 952 degrees C and eutectic point at about 2 mol% ZnO. Only narrow composition range in the KZn(4)(PO(4))(3)-ZnO system is suitable for the growth of ZnO crystals. (C) 2008 Elsevier B.V. All rights reserved.

关键词: ZnO-K(2)O-P(2)O(5) system;ZnO semiconductor;Phase diagrams;X-ray;diffraction;single-crystals;potassium;zno;orthophosphates;monophosphate;equilibria;knowledge;(kpo3)x;na

Ga、K双掺杂P型Bi0.5Sb1.5Te3材料的制备及热电性能

段兴凯 , 胡孔刚 , 丁时锋 , 满达虎 , 张汪年 , 马明亮

稀有金属

采用真空熔炼和热压方法制备了Ga和K双掺杂Bi0.5Sb1.5Te3热电材料.XRD结果表明,Ga0.02Bi0.5Sb1.48-xKxTe3块体材料的XRD图谱与Bi0.5Sb1.5Te3的XRD图谱对应一致,但双掺杂样品的衍射峰略微向左偏移.热压块体材料中存在明显的(001)晶面择优取向.SEM形貌表明材料组织致密且有层状结构特征.Ga和K双掺杂可使Bi0.5Sb1.5Te3在室温附近的Seebeck系数有一定的提高,而双掺杂样品的电导率均得到了不同程度的提高,其中Ga0.02Bi0.5Sb1.42K0.06Te3样品的电导率得到较明显的改善.在300～500 K测量温度范围内,所有双掺杂样品的热导率高于Bi0.5Sb1.5Te3的热导率,在300 K附近双掺杂样品的ZT值得到提高,其中Ga0.02Bi0.5Sb1.42K0.06Te3样品在300 K时ZT值达到1.5.

关键词: 双掺杂 , 真空熔炼 , 热压 , 显微结构 , 热电性能