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Study of super-conductors in the aluminium-magnesium system; Etude des supraconducteurs du systeme aluminium-magnesium

Abstract

The author has designed and built an apparatus for the measurement of the magnetization of superconducting alloys by the classical method of extraction. Its originality is due to the employment of a cryostat having two helium baths. The lowest temperature reached by pumping on the innermost helium bath using a primary pump combined with a BOOSTER pump is 0.75 deg. K. Temperatures are determined with a aid of Hartshorn bridge. With this apparatus, it has been possible to study the influence of extended defects on the irreversible behaviour of the magnetization of aluminium-magnesium alloys. It has been shown that the effect of these defects is important chiefly in the superconductors alloys of the second kind. The introduction of the extended defects was controlled by electron microscopy and by the measure of the residual resistivities. Finally, the author has measured for these alloys the critical fields Hc, Hc1, Hc2, the transition temperatures Tc and the coefficients of electronic specific heat {gamma}. (author) [French] L'auteur a realise un appareillage lui permettant de mesurer l'aimantation d'alliages supraconducteurs par la methode classique d'extraction. L'originalite du montage reside en la construction d'un cryostat a double bain d'helium. La temperature la plus basse atteinte en pompant  More>>
Authors:
Bonnin, B [1] 
  1. Commissariat a l'Energie Atomique, Grenoble (France). Centre d'Etudes Nucleaires
Publication Date:
May 01, 1965
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-2906
Resource Relation:
Other Information: TH: These docteur-ingenieur; 67 refs; PBD: May 1965
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; ANNEALING; CALIBRATION; COLD WORKING; CRITICAL FIELD; CRITICAL TEMPERATURE; CRYOSTATS; DISLOCATIONS; ELECTRIC CONDUCTIVITY; ELECTRONIC SPECIFIC HEAT; GINZBURG-LANDAU THEORY; GORKOV-ELIASHBERG THEORY; INDUCTANCE; MAGNESIUM ALLOYS; MAGNET COILS; MAGNETIC FLUX; MAGNETIZATION; PHASE SHIFT; QUENCHING; SUPERCONDUCTORS; TEMPERATURE DEPENDENCE; TEMPERATURE MEASUREMENT; TRANSMISSION ELECTRON MICROSCOPY
OSTI ID:
20621950
Research Organizations:
CEA Grenoble, 38 (France); Faculte des Sciences de l'Universite de Grenoble, 38 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2906065601
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
96 pages
Announcement Date:

Citation Formats

Bonnin, B. Study of super-conductors in the aluminium-magnesium system; Etude des supraconducteurs du systeme aluminium-magnesium. France: N. p., 1965. Web.
Bonnin, B. Study of super-conductors in the aluminium-magnesium system; Etude des supraconducteurs du systeme aluminium-magnesium. France.
Bonnin, B. 1965. "Study of super-conductors in the aluminium-magnesium system; Etude des supraconducteurs du systeme aluminium-magnesium." France.
@misc{etde_20621950,
title = {Study of super-conductors in the aluminium-magnesium system; Etude des supraconducteurs du systeme aluminium-magnesium}
author = {Bonnin, B}
abstractNote = {The author has designed and built an apparatus for the measurement of the magnetization of superconducting alloys by the classical method of extraction. Its originality is due to the employment of a cryostat having two helium baths. The lowest temperature reached by pumping on the innermost helium bath using a primary pump combined with a BOOSTER pump is 0.75 deg. K. Temperatures are determined with a aid of Hartshorn bridge. With this apparatus, it has been possible to study the influence of extended defects on the irreversible behaviour of the magnetization of aluminium-magnesium alloys. It has been shown that the effect of these defects is important chiefly in the superconductors alloys of the second kind. The introduction of the extended defects was controlled by electron microscopy and by the measure of the residual resistivities. Finally, the author has measured for these alloys the critical fields Hc, Hc1, Hc2, the transition temperatures Tc and the coefficients of electronic specific heat {gamma}. (author) [French] L'auteur a realise un appareillage lui permettant de mesurer l'aimantation d'alliages supraconducteurs par la methode classique d'extraction. L'originalite du montage reside en la construction d'un cryostat a double bain d'helium. La temperature la plus basse atteinte en pompant sur le bain d'helium interieur a l'aide d'une pompe BOOSTER est de 0.75 deg. K. Les temperatures sont determinees a l'aide d'un pont de Hartshorn. C'est avec cet appareillage que l'auteur a pu etudier l'influence des defauts etendus sur le comportement irreversible de l'aimantation d'alliages d'aluminium-magnesium. Il a montre que l'influence de ces defauts est essentiellement sensible dans les alliages supraconducteurs de la deuxieme espece. L'introduction des defauts etendus a ete controlee par microscopie electronique et par mesure de resistivite residuelle. Enfin, pour tous ces alliages ont ete mesures: les champs critiques Hc, Hc1, Hc2, les temperatures critiques Tc et les coefficients de chaleur specifique electronique {gamma}. (auteur)}
place = {France}
year = {1965}
month = {May}
}