Grain boundary diffusion and grain boundary segregation of tellurium in silver

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90187-W· OSTI ID:6273415

Herzig, C; Geise, J; Mishin, Y ^[1]

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1. Univ. Muenster, Muenster (Germany). Inst. fuer Metallforschung

Using the radiotracers [sup 121]Te and [sup 123]Te with high specific activity, grain boundary (GB) diffusion of Te in Ag has been studied in a wide temperature interval of about 600 K. At low temperatures (378-504) Harrison's type-C regime has been realized, which has enabled the authors to perform a number of direct measurements of the GB diffusion (GBD) coefficient D[sub GB]. The activation energy and the preexponential factor of GBD are equal to H[sub GB] = 86.75 kJ/mol and D[sub GB] = 1.01 x 10[sup [minus]4]m[sup 2]/s, respectively. Combining the obtained D[sub GB]-values with the P = sD[sub GB][delta]-values measured at higher temperatures (650-970 K) in the B-regime, the GB-segregation factor s has been estimated taking the GB width of [delta] = 0.5 nm. The resultant s-values predict an enthalpy of GB-segregation of H[sub s] [approx equal] [minus]43.29 kJ/mol. This is the first study with C-regime measurements of impurity GBD and accurate estimations of the GB-segregation factor from the GBD-data. Comparing the present results with the results of the recent C-regime measurements of GB self-diffusion in silver, a possibility of 2D-phase formation during Te GBD in Ag is discussed.

• OSTI ID: 6273415
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 41:6; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SILVER
ATOM TRANSPORT
GRAIN BOUNDARIES
TELLURIUM
DIFFUSION
EXPERIMENTAL DATA
SEGREGATION
TELLURIUM 121
TELLURIUM 123
TEMPERATURE RANGE 0400-1000 K
TRACER TECHNIQUES
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
DATA
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
METALS
MICROSTRUCTURE
NEUTRAL-PARTICLE TRANSPORT
NUCLEI
NUMERICAL DATA
RADIATION TRANSPORT
RADIOISOTOPES
SEMIMETALS
STABLE ISOTOPES
TELLURIUM ISOTOPES
TEMPERATURE RANGE
TRANSITION ELEMENTS
YEARS
360102* - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties