Accession Number : AD0689476

Title :   DIFFUSION OF 51Cr INTO POLY- AND SINGLE CRYSTALS OF NIOBIUM.

Descriptive Note : Aeronautical rept.,

Corporate Author : NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Pelleg,J. ; Lindberg,G. M.

Report Date : NOV 1968

Pagination or Media Count : 52

Abstract : Using a microsectioning technique, the diffusion of 51Cr into niobium poly- and single crystals has been measured over the temperature range 947C - 1493C. Deviations from ideal Gaussian penetration curves were observed at lower temperatures, indicating possible short-circuit diffusion paths. Observations similar to these have been reported for Nb and Ta and are believed to result from structural defects in the crystal. The results are discussed in terms of current theories for impurity diffusion. (Author)

Descriptors :   (*CHROMIUM, *DIFFUSION), (*NIOBIUM, DIFFUSION), TRANSPORT PROPERTIES, RADIOACTIVE ISOTOPES, CRYSTAL DEFECTS, SINGLE CRYSTALS, IMPURITIES, CANADA

Subject Categories : Physical Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE