Published November 1975 | Version v1
Report Open

Correlation effects in diffusion: a new approach

Creators

  • 1. CEA Centre d'Etudes Nucleaires de Fontenay-aux-Roses, 92 (France). Dept. de Physique des Reacteurs et de Mathematiques Appliquees
  • 2. CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Section de Recherches de Metallurgie Physique

Description

All the methods used up to now to solve the correlation problems are approximate: they do not allow the defect causing the migration to walk to infinity in the crystal. The new method of the present study enables to solve rigorously the correlation problems with the use of double Laplace-Fourier transforms. The method yields both: a compact formulation of all the problems previously treated by other investigators; a solution for problems still unresolved (influence of vacancy concentration on the correlation factor for self diffusion) or too much sophisticated to be treated by the previous methods (dissociated interstitial...)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (French)

Toutes les methodes utilisees jusqu'ici pour traiter la correlation sont approchees: elles ne permettent pas au defaut responsable de la diffusion de s'eloigner a l'infini dans le cristal. On presente une methode rigoureuse permettant de calculer de facon exacte la correlation, au moyen d'une transformation de Laplace et de Fourier. Cette nouvelle methode permet simultanement: de reformuler de facon synthetique tous les problemes de correlation traites anterieurement de facon eparpillee dans la litterature; de traiter de problemes encore jamais resolus (influence de la concentration de lacunes, du champ electrique sur le facteur de correlation) ou trop compliques a formuler avec les methodes anterieures (diffusion par interstitiel dissocie, etc.)

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Additional details

Additional titles

Original title (French)
La correlation entre sauts atomiques: une nouvelle methode de calcul

Publishing Information

Imprint Pagination
38 p.
Report number
CEA-R--4703

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
7245419
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
CORRELATIONS; DIFFUSION; INTERSTITIALS; MATHEMATICAL MODELS; TRACER TECHNIQUES; TRAJECTORIES; TRANSPORT THEORY; VACANCIES
Descriptors DEC
CRYSTAL DEFECTS; CRYSTAL STRUCTURE; ISOTOPE APPLICATIONS; POINT DEFECTS