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Mass dependence of intermetallic diffusion; Influence de la masse sur la diffusion intermetallique; Zavisimost' massy intermetallicheskoj diffuzii; Influencia de la masa sobre la difusion entre metales

Conference:

Abstract

Studies have been undertaken to determine the specific effect of the isotopic mass on the rates of intermetallic diffusion, to test the application of absolute-reaction-rate theory to the diffusion process and the predictions of Bardeen and. Herring regarding correlation between tracer and solvent atom jumps. Precision sectioning techniques are employed, using Fe{sup 55} and Fe{sup 50} tracers in pure silver and copper monocrystalline specimens. In order to measure the small mass dependence, extreme precision is required in the experiment. Since the two iron isotopes have completely different decay schemes, accurate differential counting can be performed using beryllium and gold absorbers, after a radiochemical separation of the tracers from the host material. Results indicate that the relative rate of diffusion of the two isotopes is considerably less than that expected classically, implying either a departure from equilibrium during the elementary diffusion jump or a strong correlation between solute and solvent atom jumps. The temperature dependence of the effect is also discussed. (author) [French] L'auteur a fait des recherches pour determiner l'effet specifique des masses isotopiques sur le taux de diffusion intermetallique, afin de verifier si la theorie de la vitesse de reaction absolue s'applique au processus de diffusion et si les  More>>
Authors:
Lazarus, D [1] 
  1. Department of Physics, University of Illinois, Urbana, IL (United States)
Publication Date:
Jan 15, 1962
Product Type:
Conference
Resource Relation:
Conference: Conference on the Use of Radioisotopes in the Physical Sciences and Industry, Copenhagen (Denmark), 6-17 Sep 1960; Other Information: 2 figs, 1 tab., 9 refs; Related Information: In: Radioisotopes in the Physical Sciences and Industry. Proceedings of the Conference on the Use of Radioisotopes in the Physical Sciences and Industry. V. 1| 556 p.
Subject:
36 MATERIALS SCIENCE; ACCURACY; BERYLLIUM; COPPER; DECAY; DIFFUSION; FORECASTING; GOLD; IRON 50; IRON 55; MASS; RADIOCHEMISTRY; REACTION KINETICS; SILVER; SOLVENTS; TEMPERATURE DEPENDENCE
OSTI ID:
22025623
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); United Nations Educational, Scientific and Cultural Organization, Paris (France)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA12N1602112916
Submitting Site:
INIS
Size:
page(s) 159-168
Announcement Date:
Jan 17, 2013

Conference:

Citation Formats

Lazarus, D. Mass dependence of intermetallic diffusion; Influence de la masse sur la diffusion intermetallique; Zavisimost' massy intermetallicheskoj diffuzii; Influencia de la masa sobre la difusion entre metales. IAEA: N. p., 1962. Web.
Lazarus, D. Mass dependence of intermetallic diffusion; Influence de la masse sur la diffusion intermetallique; Zavisimost' massy intermetallicheskoj diffuzii; Influencia de la masa sobre la difusion entre metales. IAEA.
Lazarus, D. 1962. "Mass dependence of intermetallic diffusion; Influence de la masse sur la diffusion intermetallique; Zavisimost' massy intermetallicheskoj diffuzii; Influencia de la masa sobre la difusion entre metales." IAEA.
@misc{etde_22025623,
title = {Mass dependence of intermetallic diffusion; Influence de la masse sur la diffusion intermetallique; Zavisimost' massy intermetallicheskoj diffuzii; Influencia de la masa sobre la difusion entre metales}
author = {Lazarus, D}
abstractNote = {Studies have been undertaken to determine the specific effect of the isotopic mass on the rates of intermetallic diffusion, to test the application of absolute-reaction-rate theory to the diffusion process and the predictions of Bardeen and. Herring regarding correlation between tracer and solvent atom jumps. Precision sectioning techniques are employed, using Fe{sup 55} and Fe{sup 50} tracers in pure silver and copper monocrystalline specimens. In order to measure the small mass dependence, extreme precision is required in the experiment. Since the two iron isotopes have completely different decay schemes, accurate differential counting can be performed using beryllium and gold absorbers, after a radiochemical separation of the tracers from the host material. Results indicate that the relative rate of diffusion of the two isotopes is considerably less than that expected classically, implying either a departure from equilibrium during the elementary diffusion jump or a strong correlation between solute and solvent atom jumps. The temperature dependence of the effect is also discussed. (author) [French] L'auteur a fait des recherches pour determiner l'effet specifique des masses isotopiques sur le taux de diffusion intermetallique, afin de verifier si la theorie de la vitesse de reaction absolue s'applique au processus de diffusion et si les hypotheses de Bardeen et Herring concernant la correlation entre les sauts des atomes de l'indicateur isotopique et les sauts des atomes du solvant sont exactes. Il a employe des procedes de sectionnement tres precis et il a utilise comme indicateurs du fer-55 et du fer-59 dans des echantillons monocristallins d'argent et de cuivre purs. Afin de pouvoir mesurer la faible influence de la masse, il faut que l'experience soit d'une extreme precision. Etant donne que ces deux isotopes du fer presentent des schemas de desintegration totalement differents, il est possible de proceder a un comptage differentiel precis en employant comme absorbant de l'or et du beryllium, apres avoir separe les indicateurs de la matiere qui les renferme par des methodes radiochimiques. Les resultats obtenus indiquent que, pour les deux isotopes, le taux de diffusion relatif est sensiblement inferieur a celui auquel on peut s'attendre en appliquant la methode classique, ce qui implique qu'il y a soit eloignement par rapport a leur etat d'equilibre durant les sauts de diffusion elementaire, soit une forte correlation entre les sauts des atomes du solute et du solvant. L'auteur examine egalement l'influence de la temperature sur cet effet. (author) [Spanish] El autor ha realizado estudios para determinar el efecto especifico que la masa isotopica ejerce sobre las velocidades de difusion entre metales y poder comprobar la validez de la teoria de la velocidad absoluta de reaccion para los procesos de difusion y de las predicciones de Bardeen y Herring respecto de la correlacion existente entre el indicador isotopico y los saltos de los atomos del disolvente. Ha recurrido a tecnicas de seccionamiento de precision, empleando como indicadores el hierro-55 y el hierro-59 en muestras monocristalinas de plata y de cobre puros. A fin de poder determinar las ligeras variaciones a que dan lugar las modificaciones de la masa, es menester utilizar metodos experimentales de alta precision. En vista de que los citados isotopos del hierro se desintegran segun esquemas enteramente distintos, es posible efectuar un recuento diferencial muy preciso si se emplean como absorbedores el berilio y el oro despues de haber procedido a la separacion radioquimica de los trazadores contenidos en el metal que se estudia. Los resultados indican que la velocidad relativa de difusion de ambos isotopos es muy inferior a la calculada aplicando la formula clasica; la causa puede ser que el equilibrio no rige durante los saltos observados en la difusion elemental, o que existe una correlacion muy marcada entre los saltos de los atomos del soluto y del disolvente. El autor analiza tambien la influencia ejercida por la temperatura sobre ese efecto. (author) [Russian] Byli provedeny ehksperimenty dlya opredeleniya spetsificheskogo ehffekta izotopnykh mass na stepen' intermetallicheskoj diffuzii dlya togo, chtoby proverit' primenenie teorii ob{sup e}ma absolyutnoj reaktsii k protsessu diffuzii, a takzhe vychisleniya Bardina i KHerringa v otnoshenii korrelyatsii mezhdu izotopnym indikatorom i atomnymi perekhodami v rastvoritele. Primenyayutsya metody tochnykh sechenij s ispol'zovaniem izotopnykh indikatorov zheleza-55 i zheleza-59 v chistykh serebryanykh i mednykh odnokristallicheskikh obraztsakh. Dlya izmereniya nebol'shoj zavisimosti massy pri provedenii opyta trebuetsya bol'shaya tochnost'. Poskol'ku oba izotopa zheleza imeyut sovershenno razlichnye skhemy raspada, to tochnoe differentsirovannoe izmerenie aktivnosti mozhet byt' osushchestvleno s pomoshch'yu poglotitelej iz zolota i berilliya posle radiokhimicheskogo otdeleniya izotopnykh indikatorov ot osnovnogo materiala. Rezul'taty pokazyvayut, chto otnositel'naya skorost' diffuzii dvukh dannykh izotopov yavlyaetsya znachitel'no men'shej po sravneniyu s obychno ozhidaemoj skorost'yu blagodarya ili smeshcheniyu ot svoego polozheniya ravnovesiya vo vremya perekhodov v ehlementarnoj diffuzii ili sil'noj korrelyatsii mezhdu atomnymi perekhodami rastvoryaemogo veshchestva i rastvoritelya. Takzhe rassmatrivaetsya zavisimost' ehffekta ot temperatury. (author)}
place = {IAEA}
year = {1962}
month = {Jan}
}