Hostname: page-component-848d4c4894-p2v8j Total loading time: 0.001 Render date: 2024-06-03T18:07:36.691Z Has data issue: false hasContentIssue false
  • English
  • Français

Exoelectron emission from unexcited metallic glasses Fe40Ni38Mo4B18 during heat treatment

Published online by Cambridge University Press:  31 January 2011

Yoshihisa Watanabe ,
Yoshikazu Nakamura  and
Tadayoshi Kubozoe
Yoshihisa Watanabe
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239, Japan
Yoshikazu Nakamura
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239, Japan
Tadayoshi Kubozoe
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239, Japan
Get access

Abstract

In order to elucidate a mechanism for exoelectron emission from metallic glasses during heat treatment, metallic glasses Fe40Ni38Mo4B18, which have a 140 K lower crystallization temperature than the metallic glasses Fe78B13Si9 reported previously, were heated up to 723 K with a constant heating rate of 0.5 K/s under ultrahigh vacuum condition. Although specimens were not excited by ionizing radiations, mechanical treatment, or chemical processes prior to measurements, exoelectrons have been detected for the first heating cycle. However, in the subsequent heating cycles, the counting rate does not exceed the background level. These results agree well with our previous report about metallic glasses Fe78B13Si9, but it is recently found that from the present glasses exoelectrons are emitted from the lower temperature region, and the total number of emitted exoelectrons is larger than that from the previous glasses. An atomic force microscopy (AFM) study reveals many crystallites formed on the surface of the heated specimen, and the spatial density of crystallites on the surface is much higher than that of previous glasses. Both results of exoelectron measurements and AFM observations show that the number of emitted exoelectrons increases with increasing the number of crystallites on the surface. This result implies that exoelectrons are emitted associated with the crystallites formation process on the surface.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 5 , May 1993 , pp. 1041 - 1044
Copyright
Copyright © Materials Research Society 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Scharmann, A.Jpn. J. Appl. Phys., Supplement 24–4, 6 (1985).Google Scholar
2Gorecki, Cz., J. Non-Cryst. Solids 45, 63 (1981).CrossRefGoogle Scholar
3Gorecki, Cz., Gorecki, T. and Michno, Z.Radiat. Prot. Dosim. 4, 213 (1983).Google Scholar
4Gorecki, T. and Gorecki, Cz., Jpn. I. Appl. Phys., Supplement 24–4, 27 (1985).Google Scholar
5Ingram, A.Gorecki, Cz., and Grecki, T.J. Mater. Sci. 25, 1094 (1990).Google Scholar
6Gorecki, Cz., Gorecki, T. and Michno, Z.J. Mater. Sci. 25, 1662 (1990).CrossRefGoogle Scholar
7Ingram, A.Gorecki, Cz., and Gorecki, T.J. Mater. Sci. 25, 4997 (1990).Google Scholar
8Gorecki, Cz. and Michno, Z.Mater. Chem. Phys. 24, 399 (1990).CrossRefGoogle Scholar
9Watanabe, Y.Kubozoe, T. and Nakamura, Y.J. Mater. Res. 7, 1396 (1992).Google Scholar
10Watanabe, Y. and Nakamura, Y.J. Mater. Res. 7, 2126 (1992).Google Scholar
11From Metglas catalog, Allied-Signal Inc.Google Scholar
12Gesell, T.E.Arakawa, E.T. and Callcott, T. A.Surf. Sci. 20, 174 (1970).CrossRefGoogle Scholar