搜索

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

XAFS研究Ni-P和Ni-Ce-P超细非晶合金的退火晶化

孙剑威 王晓光 闫文胜 徐法强 刘文汉 陈昌荣 韦世强

引用本文:
Citation:

XAFS研究Ni-P和Ni-Ce-P超细非晶合金的退火晶化

孙剑威, 王晓光, 闫文胜, 徐法强, 刘文汉, 陈昌荣, 韦世强

ANNEALED CRYSTALLIZATION OF ULTRAFINE Ni-P AND Ni-Ce-P AMORPHOUS ALLOYS STUDIED BY XAFS

SUN JIAN-WEI, WANG XIAO-GUANG, YAN WEN-SHENG, XU FA-QIANG, LIU WEN-HAN, CHEN CHA NG-RONG, WEI SHI-QIANG
PDF
导出引用
  • 采用原子配位分布函数为Gaussian函数PG和指数函数PE直积的非 对称模型进行拟合计算,XAFS定量地研究化学还原法制备的Ni-P和Ni-Ce-P超细非晶合金大 无序度体系中Ni原子的局域环境结构随退火温度升高而产生的变化.结果表明Ni-P和Ni-Ce-P 原样的Ni-Ni配位的平均键长Rj、配位数N、热无序度σT、结构无 序度σS分别为0271nm,100,00060nm,0028n
    XAFS technique has been used to quantitatively determine the local structure evo lutions of ultrafine Ni-P and Ni-Ce-P amorphous alloys prepared by chemical redu ction during the annealing process.Using an asymmetric atom distribution functio n model of convolution of a Gaussian function PG and an exponential f unction PE for XAFS data analysis,we obtained that the average bond l ength Rj,coordination N,thermal disorder factor σT,and s tatic disorder factor σS for the Ni-Ni first neighbor shell are 0.27 1nm,10.0,0.0060nm and 0.028nm in the Ni-P and 0.271nm,10.6,0.0070nm and 0.030nm in the Ni-Ce-P initial samples,respectively.It indicates that the σS is rather large and about three times larger than that of σT.The Ni -P sample crystallized under the annealing temperature of 573K,while the crystal lizing temperature of Ni-Ce-P sample is about 100K higher.The result suggests th at the thermal stability of Ni-Ce-P sample is significantly increased by the add ition of 2% Ce element.After being annealed at 773K,both Ni-P and Ni-Ce-P sample s are fully crystallized as metallic Ni and an amount of crystalline Ni3P.Furthermore,we have found that the static disorder σs of Ni-Ni coordination shell is 0.011nm for the Ni-P and still larger for the Ni-Ce-P samp les annealed at 773K,despite their radial distribution functions around Ni atoms are similar to that of Ni foil.It implies that the Ni lattice obtained from the crystallized Ni-P and Ni-Ce-P amorphous alloys is significantly distorted by th e interaction of P element.
    • 基金项目: 中国科学院“百人计划”和国家自然科学基金(批准号:29673038)资助的课题.
计量
  • 文章访问数:  4218
  • PDF下载量:  640
  • 被引次数: 0
出版历程
  • 收稿日期:  2000-02-07
  • 修回日期:  2000-04-10
  • 刊出日期:  2000-05-05

XAFS研究Ni-P和Ni-Ce-P超细非晶合金的退火晶化

  • 1. (1)中国科学技术大学国家同步辐射实验室,合肥 230029; (2)中国科学技术大学国家同步辐射实验室,合肥 230029;中国科学技术大学天文与应用物理系,物理系,合肥 230026
    基金项目: 

    中国科学院“百人计划”和国家自然科学基金(批准号:29673038)资助的课题.

摘要: 采用原子配位分布函数为Gaussian函数PG和指数函数PE直积的非 对称模型进行拟合计算,XAFS定量地研究化学还原法制备的Ni-P和Ni-Ce-P超细非晶合金大 无序度体系中Ni原子的局域环境结构随退火温度升高而产生的变化.结果表明Ni-P和Ni-Ce-P 原样的Ni-Ni配位的平均键长Rj、配位数N、热无序度σT、结构无 序度σS分别为0271nm,100,00060nm,0028n

English Abstract

目录

    /

    返回文章
    返回