材料期刊网

SMALL ANGLE NEUTRON SCATTERING INVESTIGATION OF Ni_(50)Mo_(50) ALLOY AND ITS FRACTAL PROPERTIES

LI MeiyaShantou University , Shantou , Guangdong , ChinaCOWLAMNUniversity of Sheffield , Sheffield S3 7RH , UKCOCCOGUniversita di Sassari , via Vienna 2 , 07100 Sassari , Italy Manuscript received 10 May , 1994

金属学报(英文版)

Small angle neutron scattering(SANS) technique has been used to investigate the Ni_(50)Mo_(50) system prepared by mechanical alloying(MA). Significant changes of the scattering intensity have been observed among the samples with different milling time.Interesting fractal-like behavior of the sample system have been found and attempts have been made to determine the fractal dimensions. It is expected that the fractal dimension can be related to the different stages of MA to some extent.

关键词: mechanical alloying , null , null

Ag掺杂In2 S3薄膜的拉曼光谱研究

林斯乐 , 马靖 , 程树英

功能材料 doi:10.3969/j.issn.1001-9731.2013.18.031

利用拉曼光谱结合 XRD与 SEM测试对未掺杂与Ag掺杂的 In2 S3薄膜进行了分析研究。XRD测试结果确定了 In2 S3的物相，并表明掺杂后晶粒尺寸发生一定的变化；拉曼光谱研究表明，掺杂后232、272及300cm-13条拉曼谱线发生红移，这是由于掺杂后晶格膨胀引起的。结合部分拉曼谱线半高宽的展宽证实了掺杂后薄膜中存在间隙 Ag 原子；SEM的测试结果进一步证实Ag掺杂后In2 S3晶格存在膨胀，并说明了In2 S3薄膜的生长方式。

关键词: In2S3 薄膜 , 掺杂 , 拉曼光谱

水热法合成Ag2 S/Bi2 S3复合材料及其热电性能研究?

罗世阶 , 鲜聪 , 王伟 , 谢淑红 , 陈秋帆 , 闫艳慈 , 周小元

功能材料 doi:10.3969/j.issn.1001-9731.2016.05.045

采用水热合成法结合放电等离子烧结技术制备了Ag2 S/Bi2 S3块体热电复合材料.采用XRD、SEM和TEM对合成粉末材料的相组成和微观形貌进行分析,闪光法和塞贝克系数/电阻测量系统测试复合块材的热电性能,系统地研究了Ag2 S的含量对Ag2 S/Bi2 S3复合材料热电性能的影响.实验结果表明,水热法成功地合成了具有球形结构的Ag2 S/Bi2 S3复合粉末；块体样品的塞贝克系数都为负,说明样品为 n型半导体；适量的 Ag2 S 复合Bi2 S3不仅有效地降低了材料的热导率,同时也提高了电导率；当Bi2 S3与3％的 Ag2 S复合时样品的热电优值(ZT 值)最大,其在724 K时的ZT 值为0．23,为纯Bi2 S3样品在该温度ZT 值的2．3倍.

关键词: 热电材料 , 水热合成法 , Ag2 S/Bi2 S3 复合材料

压电位移材料电场E3和应变S3的关系

赵莎莎 , 孙清池 , 吴浩

稀有金属材料与工程

研究了PSN-PZT三元系压电陶瓷退极化电场Ed,d33极大值时的饱和电场Es与矫顽电场Ec的关系.研究结果表明,PSN-PZT三元系压电陶瓷的矫顽电场为13.6kV/cm,退极化电场Ed小于矫顽电场Ec,更小于它的饱和电场Es.

关键词: 压电应变系数d33 , 退极化电场Ed , 矫顽电场Ec , 电滞回线

First-principles study on the electronic structure and magnetic properties of metallic antiferromagnet C7H3S2N2

Journal of Magnetism and Magnetic Materials

First-principles full potential linearized augmented plane wave (FPLAPW) calculations have been performed to study the electronic structure and the magnetic properties of 3-Cyanobenzo-1,3,2-dithiazolyl,C7H3S2N2. The density of states (DOS), the total energy of the cell, and the spontaneous magnetic moment of C7H3S2N2 were all calculated. The calculations reveal that the low-temperature phase of the compound C7H3S2N2 has a stable metal-antiferromagnetic ground state, and there exists an antiferromagnetically coupled interactions between the dithiazolyl radical(1), which is in good agreement with experiment. (C) 2006 Elsevier B.V. All rights reserved.

关键词: first-principles;antiferromagnetic states;hybridization;organic;magnets;charge-transfer salts;temperature

RH用低氟型CaO+Al2O3基熔剂深脱硫工业试验

郭上型 , 王建军 , 周俐 , 李青云 , 张才贵

钢铁钒钛

采用低氟型CaO+Al2O3复合基熔剂替代传统CaO-CaF2系脱硫剂,利用RH投入法进行钢液深脱硫工业试验.20个试验炉次的结果表明,RH平均脱硫率ηS可达到53.44%,脱硫后钢液中[S]≤24×10-6.分析了钢包顶渣的改性处理以及RH脱硫终渣组成对RH脱硫的影响.在此基础上,确定了RH脱硫剂的优化组成为:CaO+BaO(60%～65%)–Al2O3 (20%～25%)-MgO (5%～7%)–CaF2(＜5%).

关键词: RH , 钢包渣改性 , 脱硫剂 , CaO+Al2O3

THEORETICAL STUDIES OF THE SPIN HAMILTONIAN PARAMETERS AND LOCAL STRUCTURE FOR THE TETRAGONAL Rh(2+) CENTER IN RHOMBOHEDRAL BaTiO(3)

Modern Physics Letters B

The spin Hamiltonian parameters and local structure for the tetragonal Rh(2+) center in rhombohedral BaTiO(3) are theoretically studied from the perturbation formulas of these parameters for a 4d(7) ion with low spin (S = 1/2) in tetragonally elongated octahedra. This center is ascribed to substitutional Rh(2+) at the Ti(4+) site in BaTiO(3). The [RhO(6)](10-) cluster suffers relative elongation (characterized by the elongation parameter rho approximate to 0.9%) along the [100] axis due to the Jahn-Teller effect. The tetragonal elongation can entirely depress the slight trigonal distortion of the original Ti(4+) site in rhombohedral BaTiO(3). The calculated spin Hamiltonian parameters based on the above Jahn-Teller elongation show good agreement with the experimental results.

关键词: Electron paramagnetic resonance;crystal and ligand fields;Rh(2+);BaTiO(3);atomic screening constants;superposition model;scf functions;ions;defect;epr;crystals;spectrum;rhodium;system

(FeCo)73.5Cu1Nb3S15.5B7纳米晶合金晶化过程的研究

支起铮 , 王继杰 , 刘伟德 , 陈文智

功能材料

采用四探针法和X射线衍射技术研究了(FeCo)73.5CuiNb3Si15.5B7合金在定速升温过程相对电阻率与结构的变化.实验发现在电阻率快速上升的温度范围与晶化的第一阶段有关,是由纳米尺寸bcc的α-Fe(Si)固溶体形成引起的.在晶化发生的第二阶段,剩余非晶相转变为硼化物(Fe3B和Fe23B6)相,电阻率有所下降.

关键词: 纳米晶合金 , 非晶合金 , 电阻率

配合物[Sm(C7H5O3)2(C4H6NO2S)]·2H2O的热化学研究

杨德俊 , 李旭 , 李强国 , 肖圣雄 , 张应军 , 黄熠

中国稀土学报

将六水氯化钐,水杨酸与硫代脯氨酸3种物质一起反应,制得了一种新的稀土三元固体配合物[Sm(C7H5O3)2(C4H6NO2S)]·2H2O(s).通过红外光谱、热重差热分析、元素分析等手段确定了其结构与组成.在常压、298.15 K下,分别测定了六水氯化钐、水杨酸、硫代脯氨酸和该配合物在混合溶剂(二甲亚砜:乙醇:3 mol·L-1HCI=1:1:1)中的溶解焓,并根据热化学原理得出了298.15 K时配合物[Sm(C7H5O3)2(C4H6NO2S)]·2H2O(s)的标准摩尔生成焓△fHθm=(-2913.73±3.10)kJ·moL-1.

关键词: 稀土配合物 , 六水氯化钐 , 硫代脯氨酸 , 水杨酸 , 热化学

弥散强化Pt-3Rh合金高温性能

苏中华 , 彭晓东 , 谢卫东 , 刘伟廷 , 杨宗伦

稀有金属材料与工程

用粉末冶金-内氧化-烧结方法制备ZrO2弥散强化Pt-3Rh合金并测试、分析其高温性能.结果表明,Pt-3Rh合金被弥散强化以后,800℃以下的膨胀系数比Pt-3Rh大,800℃以上的膨胀系数比Pt-3Rh小；高温抗拉强度和延伸率得到提高；高温晶体结构稳定性增加;用其制备的拉丝漏板高温使用寿命与Pt-3Rh合金漏板相当.

关键词: Pt-3Rh , ZrO2 , 弥散强化 , 高温性能 , 拉丝漏板