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Title: IN SITU FIELD ION MICROSCOPE STUDY OF IRRADIATED PLATINUM. I. STAGE I RECOVERY BEHAVIOR.

Authors:
;
Publication Date:
Research Org.:
Cornell Univ., Ithaca, N. Y. Dept. of Materials Science and Engineering
OSTI Identifier:
4644465
Report Number(s):
COO-3158-3
NSA Number:
NSA-26-035230
DOE Contract Number:
AT(11-1)-3158
Resource Type:
Technical Report
Resource Relation:
Other Information: UNCL. Orig. Receipt Date: 31-DEC-72
Country of Publication:
United States
Language:
English
Subject:
N74100* -Physics (Solid State)-Radiation Effects; ION BEAMS; ION MICROSCOPY; KEV RANGE 10-100; PLATINUM; PLATINUM IONS; RADIATION EFFECTS; SURFACES; ULTRALOW TEMPERATURE; PLATINUM/radiation effects on, in situ field ion microscopic study of stage I recovery from 20 or 30 keV platinum ion, (E/T); PLATINUM IONS/effects on platinum at 20 or 30 keV, in situ field ion microscopic study of stage I recovery from, (E/T)

Citation Formats

Petroff, P., and Seidman, D.N.. IN SITU FIELD ION MICROSCOPE STUDY OF IRRADIATED PLATINUM. I. STAGE I RECOVERY BEHAVIOR.. United States: N. p., 1971. Web. doi:10.2172/4644465.
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Petroff, P., & Seidman, D.N.. IN SITU FIELD ION MICROSCOPE STUDY OF IRRADIATED PLATINUM. I. STAGE I RECOVERY BEHAVIOR.. United States. doi:10.2172/4644465.
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Petroff, P., and Seidman, D.N.. Fri . "IN SITU FIELD ION MICROSCOPE STUDY OF IRRADIATED PLATINUM. I. STAGE I RECOVERY BEHAVIOR.". United States. doi:10.2172/4644465. https://www.osti.gov/servlets/purl/4644465.
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@article{osti_4644465,
title = {IN SITU FIELD ION MICROSCOPE STUDY OF IRRADIATED PLATINUM. I. STAGE I RECOVERY BEHAVIOR.},
author = {Petroff, P. and Seidman, D.N.},
abstractNote = {},
doi = {10.2172/4644465},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1971},
month = {Fri Jan 01 00:00:00 EST 1971}
}
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Technical Report:
View Technical Report (3.66 MB)
DOI:  10.2172/4644465
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  • Three field ion microscope (FIM) experiments were carried out to study the annealing behavior of heavy ion irradiated tungsten, tungsten (rhenium) alloys and molybdenum. The first experiment dealt with the stage I long-range migration of tungsten self interstitial atoms (SIAs) in high purity tungsten of resistivity ratio, R = 24,000 (R = rho/sub 300//rho/sub 4/./sub 2/, where rho/sub 300/ and rho/sub 4/./sub 2/ are the room temperature and 0/sup 0/C resistivities). The FIM specimens were irradiated in situ at 18 K with 30 keV W/sup +/ ions to an average dose of 5 x 10/sup 12/ ions cm/sup -2/ andmore » subsequently examined by the pulsed-field evaporation technique. The second experiment dealt with the phenomenon of impurity atom trapping of SIAs during long-range migration. It was shown that rhenium atoms in a tungsten matrix tend to capture tungsten SIAs and remain bound up to temperatures as high as 390 K. The final experiment was concerned with the low temperature annealing kinetics of irradiated molybdenum. High purity molybdenum of resistivity ratio R = 5700 was irradiated at 10 K with 30 keV Mo/sup +/ ions to a dose of approximately 5 x 10/sup 12/ ions cm/sup -2/. The results indicated that the electric field has only a minimal effect on the SIA annealing kinetics. This tends to strengthen the contention that the molybdenum SIA becomes mobile at 32 K.« less

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    Five grades of W specimens with different purity levels were irradiated to a dose of typicaly 5 x 10/sup 12/ ion cm/sup -2/ at 18/sup 0/K. Examination with a low-temperature field-ion microscope showed the isochronal-annealing spectra of the specimens to result from a large self-interstitial atom (SIA) flux at approx. 38/sup 0/K, followed by significant SIA flux from approx. 50 to 80/sup 0/K and a small amount of additional recovery up to 120/sup 0/K. The spectra for these specimens were essentially identical between 18 and 120/sup 0/K. High-purity W specimens doped with C showed only a small reduction in themore » amount of recovery observed for the long-range migration peak at 38/sup 0/K. The isochronal recovery spectra for W-Re specimens were different from the isochronal recovery spectra of pure W specimens. For both alloys the recovery of the Stage I long-range migration peak at 38/sup 0/K was strongly suppressed. All recovery from 18 to 120/sup 0/K was virtually eliminated indicating that during the long-range migration substage at 38/sup 0/K tightly-bound, immobile SIA-Re complexes were formed that suppressed the SIA--SIA reaction. This effect was observed at high Re atom concentrations. The lack of any significant differences for the annealing spectra of the five purity-levels of undoped W and the appearance of impurity effects in the extremely concentrated alloys indicated that the early Stage II recovery observed in the annealing spectra of self-ion irradiated high-purity W was intrinsic. Because of the highly inhomogeneous SIA distribution of the W/sup +/ ion damage, the SIA--SIA interaction during Stage I long-range migration at 38/sup 0/K appeared to be the dominant trapping mechanism. The early Stage II SIA recovery was attributed to the migration or dissolution of these SIA clusters.« less

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    Direct and visible evidence was obtained for long-range migration of self-interstitial atoms (SIAs) in Stage II of three different ion-irradiated platinum (gold) alloys. Field-ion microscope (FIM) specimens of Pt--0.10, 0.62 and 4.0 at. percent Au alloys were irradiated in-situ with 30-keV W/sup +/ or Pt/sup +/ ions at a tip temperature of 35 to 41 K at 2 x 10/sup -9/ torr. Direct observation of the surfaces of the FIM specimens during isochronal warming experiments to 100 K showed that a flux of SIAs crossed the surfaces of the specimens between 40 to 100 K. The spectrum for each alloymore » consisted of two recovery peaks (substages II/sub B/ and II/sub C/). The results are explained on the basis of an impurity-delayed diffusion mechanism employing a two-level trapping model. The application of this diffusion model to the isochronal recovery spectra yielded a dissociation enthalpy (DELTAh/sub li-Au//sup diss/) and an effective diffusion coefficient for each substage; for substage II/sub B/ DELTAh/sub li-Au//sup diss/ (II/sub B/) = 0.15 eV and for substage II/sub C/ DELTAh/sub li-Au//sup diss/ (II/sub C/) = 0.24 eV. A series of detailed control experiments was also performed to show that the imaging electric field had not caused the observed long-range migration of SIAs and that the observed effects were not the result of surface artifacts. 14 figures, 6 tables.« less