DIRECT OBSERVATION OF LONG-RANGE MIGRATION OF SELF-INTERSTITIAL ATOMS IN STAGE I OF IRRADIATED PLATINUM
- 1 June 1971
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 18 (11), 518-520
- https://doi.org/10.1063/1.1653520
Abstract
The motion of single self‐interstitial atoms (SIA's) in stage I of irradiated platinum was observed directly by field ion microscopy. A specimen irradiated at a temperature of 10°K with 20‐keV Pt+ ions was found to contain immobile SIA's in the bulk at this temperature, as determined via pulse‐field evaporation experiments. Direct observation of specimens, irradiated with 20‐ or 30‐keV Pt+ ions, during warming experiments from 10 to 70°K showed that a flux of SIA's crossed the surface of the specimens between 13 and 25°K. Application of a diffusion model to the data yielded a value of ∼ 0.06 eV for the enthalpy change of migration and a diffusion coefficient of ∼ 0.5 exp(−0.06 eV/kT) cm2 sec−1 for the SIA.Keywords
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