An in situ field ion microscope study of irradiated platinum-I. Stage I recovery behavior

P. Pétroff; David N. Seidman

doi:10.1016/0001-6160(73)90187-9

An in situ field ion microscope study of irradiated platinum-I. Stage I recovery behavior

P. Pétroff^*, David N. Seidman

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

Direct visual evidence for uncorrelated long-range migration of self-interstitial atoms (SIA's) in substage I_e of irradiated platinum was obtained by a series of in situ field ion microscope (FIM) experiments. High purity [(2-6) · 10(su-5) and (1-3) · 10(su-6) at. fraction impurity level] platinum specimens were irradiated with 20 or 30 ke V Pt⁺ ions under ultra-high vacuum conditions at a specimen temperature of 10 or 11°K. The initial damage pattern at 10°K consisted of depleted zones within ~100 Å of tha irradiated surface and a distribution of immobile SIA's in the bulk of the specimen. Next the specimens were isochronally warmed from 10 or 11°K to 75°K [average linear warming rate = ( 1 3)°K min^-1] at a constant value of the imaging electric field while the specimens' surfaces were photographed at a rate of 1 frame sec^-1. This experiment showed that a flux of SIA's crossed the specimens' surfaces between 13 and 27°K. A detailed series of control experiments were performed to demonstrate that the contrast effects observed were not due to impurity atoms or surface artifacts. Application of our diffusion model (Scanlan et al.) to the isochronal recovery spectrum yielded an enthalpy change of migration of ~0.04eV and a diffusion coefficient of ~(0.08-0.77) exp (-0.04 eV/kT) cm² sec^-1 for the SIA. The FIM specimen was, of course, subjected to a negative hydrostatic pressure during the field ion imaging process which was caused by the required imaging field of 4-4.75 V (A)^-1. Thus, it was possible to combine an existing value for the internal energy change of migration for recovery in substages I_D and I_E with our enthalpy change of migration to yield a range of limiting values for the volume change of migration of a SIA [(2.3-3.2) · 10² at. vol.].

Original language	English (US)
Pages (from-to)	323-334
Number of pages	12
Journal	Acta Metallurgica
Volume	21
Issue number	4
DOIs	https://doi.org/10.1016/0001-6160(73)90187-9
State	Published - Apr 1973

Funding

* Receivecl April 6, 1952. Research supported by the United States Atomic Energy Commission. Additional support received from the Advanceci Researc’h Projects Agency through the we of the tec’hnicai facilities of the XateriaL Science Center at Cornell University. i Cornell Cniversity, Department of Materials Science and Engineering, Ithaca, Sew York 14650. E Sow az: Bell Telephone Laboratories, 600 Mountain Avenue, Murray Hill, Sew Jersey 079i-l. 3 .John Simon Guggenheim Memorial Foundation Fellon 1972-73.

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General Engineering

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10.1016/0001-6160(73)90187-9

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@article{013b8fde3a684318b52cade3906eb7b2,

title = "An in situ field ion microscope study of irradiated platinum-I. Stage I recovery behavior",

abstract = "Direct visual evidence for uncorrelated long-range migration of self-interstitial atoms (SIA's) in substage Ie of irradiated platinum was obtained by a series of in situ field ion microscope (FIM) experiments. High purity [(2-6) · 10(su-5) and (1-3) · 10(su-6) at. fraction impurity level] platinum specimens were irradiated with 20 or 30 ke V Pt+ ions under ultra-high vacuum conditions at a specimen temperature of 10 or 11°K. The initial damage pattern at 10°K consisted of depleted zones within \textasciitilde{}100 {\AA} of tha irradiated surface and a distribution of immobile SIA's in the bulk of the specimen. Next the specimens were isochronally warmed from 10 or 11°K to 75°K [average linear warming rate = ( 1 3)°K min-1] at a constant value of the imaging electric field while the specimens' surfaces were photographed at a rate of 1 frame sec-1. This experiment showed that a flux of SIA's crossed the specimens' surfaces between 13 and 27°K. A detailed series of control experiments were performed to demonstrate that the contrast effects observed were not due to impurity atoms or surface artifacts. Application of our diffusion model (Scanlan et al.) to the isochronal recovery spectrum yielded an enthalpy change of migration of \textasciitilde{}0.04eV and a diffusion coefficient of \textasciitilde{}(0.08-0.77) exp (-0.04 eV/kT) cm2 sec-1 for the SIA. The FIM specimen was, of course, subjected to a negative hydrostatic pressure during the field ion imaging process which was caused by the required imaging field of 4-4.75 V (A)-1. Thus, it was possible to combine an existing value for the internal energy change of migration for recovery in substages ID and IE with our enthalpy change of migration to yield a range of limiting values for the volume change of migration of a SIA [(2.3-3.2) · 102 at. vol.].",

author = "P. P{\'e}troff and Seidman, \{David N.\}",

note = "Funding Information: * Receivecl April 6, 1952. Research supported by the United States Atomic Energy Commission. Additional support received from the Advanceci Researc{\textquoteright}h Projects Agency through the we of the tec{\textquoteright}hnicai facilities of the XateriaL Science Center at Cornell University. i Cornell Cniversity, Department of Materials Science and Engineering, Ithaca, Sew York 14650. E Sow az: Bell Telephone Laboratories, 600 Mountain Avenue, Murray Hill, Sew Jersey 079i-l. 3 .John Simon Guggenheim Memorial Foundation Fellon 1972-73.",

year = "1973",

month = apr,

doi = "10.1016/0001-6160(73)90187-9",

language = "English (US)",

volume = "21",

pages = "323--334",

journal = "Acta Metallurgica",

issn = "0001-6160",

publisher = "Acta Materialia Inc",

number = "4",

}

TY - JOUR

T1 - An in situ field ion microscope study of irradiated platinum-I. Stage I recovery behavior

AU - Pétroff, P.

AU - Seidman, David N.

N1 - Funding Information: * Receivecl April 6, 1952. Research supported by the United States Atomic Energy Commission. Additional support received from the Advanceci Researc’h Projects Agency through the we of the tec’hnicai facilities of the XateriaL Science Center at Cornell University. i Cornell Cniversity, Department of Materials Science and Engineering, Ithaca, Sew York 14650. E Sow az: Bell Telephone Laboratories, 600 Mountain Avenue, Murray Hill, Sew Jersey 079i-l. 3 .John Simon Guggenheim Memorial Foundation Fellon 1972-73.

PY - 1973/4

Y1 - 1973/4

N2 - Direct visual evidence for uncorrelated long-range migration of self-interstitial atoms (SIA's) in substage Ie of irradiated platinum was obtained by a series of in situ field ion microscope (FIM) experiments. High purity [(2-6) · 10(su-5) and (1-3) · 10(su-6) at. fraction impurity level] platinum specimens were irradiated with 20 or 30 ke V Pt+ ions under ultra-high vacuum conditions at a specimen temperature of 10 or 11°K. The initial damage pattern at 10°K consisted of depleted zones within ~100 Å of tha irradiated surface and a distribution of immobile SIA's in the bulk of the specimen. Next the specimens were isochronally warmed from 10 or 11°K to 75°K [average linear warming rate = ( 1 3)°K min-1] at a constant value of the imaging electric field while the specimens' surfaces were photographed at a rate of 1 frame sec-1. This experiment showed that a flux of SIA's crossed the specimens' surfaces between 13 and 27°K. A detailed series of control experiments were performed to demonstrate that the contrast effects observed were not due to impurity atoms or surface artifacts. Application of our diffusion model (Scanlan et al.) to the isochronal recovery spectrum yielded an enthalpy change of migration of ~0.04eV and a diffusion coefficient of ~(0.08-0.77) exp (-0.04 eV/kT) cm2 sec-1 for the SIA. The FIM specimen was, of course, subjected to a negative hydrostatic pressure during the field ion imaging process which was caused by the required imaging field of 4-4.75 V (A)-1. Thus, it was possible to combine an existing value for the internal energy change of migration for recovery in substages ID and IE with our enthalpy change of migration to yield a range of limiting values for the volume change of migration of a SIA [(2.3-3.2) · 102 at. vol.].

AB - Direct visual evidence for uncorrelated long-range migration of self-interstitial atoms (SIA's) in substage Ie of irradiated platinum was obtained by a series of in situ field ion microscope (FIM) experiments. High purity [(2-6) · 10(su-5) and (1-3) · 10(su-6) at. fraction impurity level] platinum specimens were irradiated with 20 or 30 ke V Pt+ ions under ultra-high vacuum conditions at a specimen temperature of 10 or 11°K. The initial damage pattern at 10°K consisted of depleted zones within ~100 Å of tha irradiated surface and a distribution of immobile SIA's in the bulk of the specimen. Next the specimens were isochronally warmed from 10 or 11°K to 75°K [average linear warming rate = ( 1 3)°K min-1] at a constant value of the imaging electric field while the specimens' surfaces were photographed at a rate of 1 frame sec-1. This experiment showed that a flux of SIA's crossed the specimens' surfaces between 13 and 27°K. A detailed series of control experiments were performed to demonstrate that the contrast effects observed were not due to impurity atoms or surface artifacts. Application of our diffusion model (Scanlan et al.) to the isochronal recovery spectrum yielded an enthalpy change of migration of ~0.04eV and a diffusion coefficient of ~(0.08-0.77) exp (-0.04 eV/kT) cm2 sec-1 for the SIA. The FIM specimen was, of course, subjected to a negative hydrostatic pressure during the field ion imaging process which was caused by the required imaging field of 4-4.75 V (A)-1. Thus, it was possible to combine an existing value for the internal energy change of migration for recovery in substages ID and IE with our enthalpy change of migration to yield a range of limiting values for the volume change of migration of a SIA [(2.3-3.2) · 102 at. vol.].

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U2 - 10.1016/0001-6160(73)90187-9

DO - 10.1016/0001-6160(73)90187-9

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JO - Acta Metallurgica

JF - Acta Metallurgica

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ER -

An in situ field ion microscope study of irradiated platinum-I. Stage I recovery behavior

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