Superconductor Science & Technology
In this paper we report the transport properties of c-axis-oriented superconducting La(1.44)Nd(0.4)Sr(0.16)CuO(4) films on LaSrAlO(4) substrates with different thicknesses in various magnetic fields parallel and perpendicular to the c axis of the films. It is found that with decreasing film thickness there is a crossover from the parallel shift to fan-shape broadening in the resistive transitions. Moreover, for both field configurations, the flux pinning potential U(0)(H) of the film shifts upward with an order of magnitude with increasing in-plane compressive strain. These results indicate that the compressive epitaxial strain and strain-induced destabilization of the static charge stripes are important aspects for the promotion of superconducting transition temperature as well as the flux pinning potential.
关键词:
high-temperature superconductors;crystal thin-films;flux motion;la2-xsrxcuo4;strain;insulator;dependence;behavior
陈松
,
胡昌义
,
郭俊梅
,
杨家明
稀有金属材料与工程
研究了Ir/Re喷管制备过程中的Ir/Mo互扩散问题.在电子探针测量的基础上,根据扩散理论和Ir-Mo相图数据,建立并推导Ir/Mo扩散模型和解.计算得到Ir3Mo相中的互扩散系数为:D=9.0×10-9exp(-1.46 eV/kT)(cm2/s),Ir基固溶体中的互扩散系数为:D=5.0×10-10exp(-1.1eV/kT)(cm2/s).确定喷管中Ir/Mo互扩散的特点,给出估算Ir3Mo相层厚的方法.确定Re在Ir3Mo相中的扩散主要是受Ir控制.
关键词:
Ir
,
Mo
,
Re
,
扩散
李云凯
,
王勇
,
李树奎
,
韩文波
复合材料学报
doi:10.3321/j.issn:1000-3851.2003.06.009
利用有限元分析方法,对PSZ/Mo功能梯度材料进行了优化设计,确定了最佳形状因子、层数和每一层的厚度.在此基础上,用热压烧结方法制备了六层结构的PSZ/Mo功能梯度材料.利用自制的FGM热性能测试仪,对制备的试样进行了热震性能实验,通过该实验条件下应力场和温度场的有限元计算,阐述了PSZ/Mo功能梯度材料优良抗热震性的原因.
关键词:
优化设计
,
有限元
,
PSZ/Mo功能梯度材料
LIANG Guoxian WANG Erde HUO Wencan Harbin Institute of Technology
,
Harbin
,
China Post Box 435
,
Harbin Institute of Technology
,
Harbin 150006
,
China
金属学报(英文版)
Ni_(100-x)Mo_x(x=20,30,38)alloys have been synthesized by mechanical alloying.The structure evolution of powders in mechanical alloying process has been monitored by X-ray diffraction,scanning electron microscopy and transmission electron microscopy analyses.The results show that the Ni_(62)Mo_(38)sample becomes partially amorphous after high energy ball milling,while the Ni_(80)Mo_(20)and Ni_(70)Mo_(30)become non-equilibrium nanocrystals.
关键词:
mechanical alloying
,
null
,
null
,
null
李雪
,
卢公昊
,
王淼
,
高田润
材料与冶金学报
doi:10.14186/j.cnki.1671-6620.2015.02.011
利用Al-Si混合粉末包覆金属Mo,并在Ar气氛围中,900℃进行高温扩散反应,在金属Mo表面制备Mo(Si,Al)2化合物层.在空气中12 00℃的条件下进行的高温氧化试验表明,化合物Mo(Si,Al)2具有优异的抗氧化性,样品外表面生成了致密的氧化铝层,从而阻止样品内部被进一步氧化.另外,氧化试验后在基体Mo和Mo (Si,Al)2层界面处还观察到Mo5(Si,Al)3层和Mo3 Al8层.
关键词:
金属Mo
,
Mo(Si,Al)2
,
粉末包覆法
,
高温抗氧化性
秦俊岭
,
易葵
,
邵建达
功能材料与器件学报
doi:10.3969/j.issn.1007-4252.2006.02.001
用磁控溅射法制备了Mo/Si薄膜,用AFM和XRD分别研究了Mo原子的溅射能量不同时,Mo/Si薄膜表面形貌和晶相的变化.通过比较发现,随着Mo原子溅射能量的增大,Mo/Si薄膜表面粗糙度增加,Mo和Si的特征X射线衍射峰也越来越强,并且Mo膜层和Si膜层之间生成了MoSi2.Mo原子的溅射能量是诱导非晶Si结晶和MoSi2生成的主要原因.
关键词:
Mo/Si
,
MoSi2
,
溅射能量
