Point-Defect Studies in Platinum by Electron Irradiation at Low Temperatures. II. Resistivity Recovery from 10 to 300°K

Abstract

Pairs of 99.999%-pure platinum wires were irradiated with equal doses below 10°K and annealed simultaneously. The recovery spectrum of both wires was closely identical. However, when one of the wires was quenched prior to the irradiation, the irradiation-damage recovery was remarkeably different from that of the unquenched wire: The ratio of the rate of recovery of the quenched to the unquenched wire was nearly 1 from 10 to 24°K, near 2 from 24 to 27°K, and near 0 from 28 to 32°K. The amount of recovery of the quenched sample was enhanced 7% over the unquenched sample. These results are strong evidence for long-range (uncorrelated) migration of an interstitial near 28 °K. Only a few percent recovery takes place in either the quenched or the unquenched sample between 35 and 300°K. These observations, combined with other relevant experimental results and calculations based on chemical rate theory, provide evidence that the defects remaining above 35 °K are mainly trapped interstitials, di-interstitials, and vacancies. Stage III is due to the release of trapped interstitials and the migration (or dissociation) of dimers. The vacancies migrate near 600 °K (stage IV).

In Situ Field Ion Microscope Study of Irradiated Platinum. I. Stage I Recovery Behavior.

“…The (12) same effect of quenched-in vacancies was simultaneously observed in deuteron (20 MeV) irradiated platinum by Herschbach and Jackson Recently, Dib- (13) bert et al have presented a systematic and detailed study of the effects (2) of electron dose, gold impurity atoms, radiation doping and initial electron energy on the recovery behavior of electron irradiated platinum which gives further indirect evidence that IE is due to uncorrelated long range migration of a SIA. ' We present in this paper direct visual evidence obtained from a series of in-situ field ion microscope (FIM) experiments which demonstrate that SIA's undergo uncorrelated long range migration in IE of platinum.…”

“…The main difference in the state of damage produced by these different types of irradiating particles is in the spatial arrangement of the (1) Frenkel pairs The Stage I recovery spectrum of platinum, electron irradiated to low doses, is particularly pretty as the 5 Substages (IA to IE) are clearly resolved (2,12) For heavy metal ion damage IA to IC involves the recombination of Frenkel pairs within and around a depleted zone. These recombination events can be monitored by electrical resistivity measurements, but are not detectable by our FIM experiments.…”

Stage I Recovery of Resistivity in Electron‐Irradiated Silver and Gold. I. Silver

“…However, if such a peak does exist, its location, as predicted by the temperture shift observed between copper and silver, would be below the irradiation temperature. The small recovery 6. Comparison of recovery rate spectra of silver and copper after irradiation with 2.0 YeV electrons to nearly identical resistivity increments peak that occurs just below the I, peak in ~ copper does not have a related peak in silver.…”

Close pair recombinations in irradiated platinum

“…After the postirradiation measurements the specimen was annealed at 8.50 K for ten minutes to eliminate effects from differences in temperature from one irradiation to another, then remeasured. The annealing rate is very low at 8.5 K, a temperature below the onset of substantial recovery in substage IA.6*7, 17 The major correction to the raw data arises from ~ a deviation from Matthiessen's rule, an increase with measuring temperature of the increment of resistivity due to the defects.I2 This positive temperature coefficient means that the increment measured at a temperature, TI, is larger than that due to an identical defect population measured at a lower temperature, T I , in a specimen heated more slowly. The corrections were determined in auxiliary experiments.…”