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Study of the point defects formed in cobalt by electron bombardment; Etude des defauts ponctuels crees par bombardement electronique dans le cobalt

Abstract

A study of the point defects formed in cobalt by electron bombardment is presented. The results are compared with those previously obtained for two other ferromagnetic metals of different structure, iron and nickel. In the first part we give a review of the literature concerning the creation of point defects, their contribution to resistivity and their annihilation mode in the three structure types. We then describe the experimental techniques adapted, in particular the study of the resistivity increase during a linear temperature rise. Our investigations concern the following, essential points : the observation of the successive annihilation stages of the point defects formed in pure cobalt, a study of the variations with respect to the doses and energy of the incident particles, and the determination of the annealing kinetics and the corresponding activation energies. The results are finally compared with the various models of point defect annihilation proposed for other metals: none of these interpretations is in perfect agreement with our results. In the case of cobalt we are thus led to modify the model proposed by our laboratory for iron an nickel. The difference between these three metals is explained by the anisotropic character of the cobalt matrix. (author)  More>>
Authors:
Sulpice, G [1] 
  1. Commissariat a l'Energie Atomique, 38 - Grenoble (France). Centre d'Etudes Nucleaires
Publication Date:
Dec 01, 1968
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-3604
Resource Relation:
Other Information: TH: These 3. cycle; 44 refs; PBD: Dec 1968
Subject:
36 MATERIALS SCIENCE; ANISOTROPY; ANNEALING; CALORIMETRY; COBALT; ELECTRIC CONDUCTIVITY; ELECTRON BEAMS; FAST NEUTRONS; FRENKEL DEFECTS; INTERSTITIALS; IRON; MAGNETIC PROPERTIES; NICKEL; PHYSICAL RADIATION EFFECTS
OSTI ID:
20523387
Research Organizations:
CEA Grenoble, 38 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR04R3604091442
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[57] pages
Announcement Date:

Citation Formats

Sulpice, G. Study of the point defects formed in cobalt by electron bombardment; Etude des defauts ponctuels crees par bombardement electronique dans le cobalt. France: N. p., 1968. Web.
Sulpice, G. Study of the point defects formed in cobalt by electron bombardment; Etude des defauts ponctuels crees par bombardement electronique dans le cobalt. France.
Sulpice, G. 1968. "Study of the point defects formed in cobalt by electron bombardment; Etude des defauts ponctuels crees par bombardement electronique dans le cobalt." France.
@misc{etde_20523387,
title = {Study of the point defects formed in cobalt by electron bombardment; Etude des defauts ponctuels crees par bombardement electronique dans le cobalt}
author = {Sulpice, G}
abstractNote = {A study of the point defects formed in cobalt by electron bombardment is presented. The results are compared with those previously obtained for two other ferromagnetic metals of different structure, iron and nickel. In the first part we give a review of the literature concerning the creation of point defects, their contribution to resistivity and their annihilation mode in the three structure types. We then describe the experimental techniques adapted, in particular the study of the resistivity increase during a linear temperature rise. Our investigations concern the following, essential points : the observation of the successive annihilation stages of the point defects formed in pure cobalt, a study of the variations with respect to the doses and energy of the incident particles, and the determination of the annealing kinetics and the corresponding activation energies. The results are finally compared with the various models of point defect annihilation proposed for other metals: none of these interpretations is in perfect agreement with our results. In the case of cobalt we are thus led to modify the model proposed by our laboratory for iron an nickel. The difference between these three metals is explained by the anisotropic character of the cobalt matrix. (author) [French] Nous presentons une etude des defauts ponctuels crees par bombardement electronique dans le cobalt et comparons nos resultats a ceux obtenus precedemment dans deux autres metaux ferromagnetiques de structure differente, le fer et le nickel. Dans une premiere partie nous faisons une mise au point bibliographique comparee sur la creation des defauts, leur contribution a la resistivite et leur mode d'annihilation dans les trois types de structure. Nous decrivons ensuite les techniques experimentales mises au point, en particulier l'etude du revenu de la resistivite au cours d'une montee lineaire de temperature. Au cours de ce travail, nous avons mis en evidence les stades successifs d'annihilation des defauts ponctuels crees dans le cobalt pur, nous avons etudie les variations avec la dose et l'energie des particules incidentes et determine les cinetiques de guerison et les energies d'activation correspondantes. Nous confrontons alors les resultats avec les differents modeles d'annihilation des defauts ponctuels proposes pour d'autres metaux; aucune de ces interpretations ne s'accorde parfaitement avec nos resultats, ce qui nous conduit dans le cas du cobalt a introduire une variante du modele soutenu par notre laboratoire pour le fer et le nickel. La difference entre ces trois metaux est expliquee par le caractere anisotrope du cobalt. (auteur)}
place = {France}
year = {1968}
month = {Dec}
}