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Structure and Stability of Multi-Component Amorphous Alloy Separated into Two Phases on Nanometer Scale for Hydrogen Strage.

用于氢存储的纳米级两相多组分非晶合金的结构和稳定性。

基本信息

批准号：
62550513
负责人：
FUKUNAGA Toshiharu
金额：
$ 1.22万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550513/
关键词：
Hydrogenated Alloy Amorphous Alloy Atomic Structure 中性子散乱水素吸蔵

项目摘要

Large and small angle scattering experiments of (Ni_<1-y>Zr_y)_<1-x>V_x ternary and Y_<1-x>Al_x-D hydrogenated amorphous alloys have been studied by pulsed neutron scattering using accelator neutron sources.The chemical short range order parameters calculated from the first neighbor coordination numbers of Ni-Ni, Ni-Zr and Zr-Zr paircorrelations show positive and increase gradually with increasing Vcontent in (Ni_<1-y>Zr_y)_<1-x>V_x ternary amorphous alloy. This result means that the chemical ordering of Ni-Zr unlike atom pair correlation is enhanced by alloying V atom into Ni_<1-y>Zr_y binary system. The SANS intensity in the vicinity of Q-0.15 A^<-1> apart from that in Q<0.05 A^<-1> was newly observed in (Ni_<.67>Zr_<.33>)_<.7>V_<.33> ternary amorphous alloy, which is caused by the third element V atom. The characteristic function (r) obtained as the Fourier transform from the newly SANS intensity indicates that the concentration fluctuation with small size of about 9 A in diameter has been produced by the constituent V atom in (Ni_<.67>Zr_<.33>)_<.7>V_<.3> ternary amophous alloy. The atomic rearrangement, nano-scale fluctuation, induced by the third element may take place by the chemical frustration based on the chemical affinities among the constituent atoms.A1-Y amorphous alloys store D(H) atoms in the 6-fold octahedral site in low D(H) content and the 4-fold tetrahedral site in high D(H) content consisting of only Y atoms. Based on the observation of small angle neutron scattering intensity, it is concluded that the nanoscale concentration fluctuation of D atoms appears in A1-Y-D amorphous alloys.

用加速器中子源脉冲中子散射研究了（Ni_<1-y>Zr_y）_<1-x>V_x三元非晶合金和Y_<1-x>Al_x-D氢化非晶合金的大、小角散射实验，由Ni-Ni、Ni-Zr和Zr-Zr对关联的第一邻配位数计算得到的化学短程有序参数均为正值，且随V含量的增加而逐渐增大<1-y><1-x>。这一结果表明，V原子合金化增强了Ni-Zr异原子对关联的化学有序性<1-y>。在<-1><-1>（Ni_<.67>Zr_<.33>）_<.7>V_<.33>三元非晶合金中，除了Q<0.05 A_（？）由新SANS强度的傅里叶变换得到的特征函数r表明，（Ni_ Zr_）_ V_三元非晶态合金中的V原子产生了直径约为9A的浓度涨落<.67><.33><.7><.3>。第三种元素引起的原子重排，即纳米尺度的涨落，可能是由于组成原子之间的化学亲合力引起的化学阻挫作用而发生的。在低D（H）含量时，A1-Y非晶合金将D（H）原子储存在6重八面体位置，而在高D（H）含量时，则储存在仅由Y原子组成的4重四面体位置。基于小角中子散射强度的观测，得出了在A1-Y-D非晶合金中出现了纳米尺度的D原子浓度涨落的结论。