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STUDY OF ALLOY SURFACES AND ION AND ...

KUK, YOUNG.

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STUDY OF ALLOY SURFACES AND ION AND ELECTRON EMITTER SURFACES BY THE FIELD ION MICROSCOPE.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	STUDY OF ALLOY SURFACES AND ION AND ELECTRON EMITTER SURFACES BY THE FIELD ION MICROSCOPE./
作者:	KUK, YOUNG.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1981,
面頁冊數:	160 p.
附註:	Source: Dissertations Abstracts International, Volume: 42-07, Section: B.
Contained By:	Dissertations Abstracts International42-07B.
標題:	Condensation. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8129176
ISBN:	9798641021065

STUDY OF ALLOY SURFACES AND ION AND ELECTRON EMITTER SURFACES BY THE FIELD ION MICROSCOPE.
KUK, YOUNG.

STUDY OF ALLOY SURFACES AND ION AND ELECTRON EMITTER SURFACES BY THE FIELD ION MICROSCOPE. - Ann Arbor : ProQuest Dissertations & Theses, 1981 - 160 p.

Source: Dissertations Abstracts International, Volume: 42-07, Section: B.

Thesis (Ph.D.)--The Pennsylvania State University, 1981.

This item must not be sold to any third party vendors.

An energy compensated, high performance, time-of-flight atom probe with an atomic resolution and an absolute depth calibration has been used to study the surface segregation of the various alloys, NiCu, FeTi, FeP, and the surface ordering of NiCr alloys. The experimental results obtained in the present study agree fairly well with the theoretically calculated predictions and the experimental results obtained by other techniques. The enrichment factors on the surfaces of NiCu alloys were measured and compared to those predicted by the electronic theory for surface segregation. The results show the feasibility of applying the time-of-flight atom probe for the study of the surface segregation of any substitutionally disordered alloy, while techniques have their own instrumental problems. Surface and grain boundary segregation experiments for dilute FeTi alloys and FeP alloys were performed. Because of the micro-analytical capability of the time-of-flight atom probe, the dynamic and the static properties of the dilute alloys could be measured. For the study of the dynamic properties of alloys, nucleation and growth in NiCr alloys were chosen and studied. A magnetic sector atom probe with an energy resolution E/(DELTA)E of 20,000 was used to measure the energy distributions of the various ion species coming from a point source liquid metal gallium ion emitter. A spectroscopic study of the optical emission from the liquid metal emitter was performed. From the energy distribution measurement and the optical emission measurement, a model for the ionization mechanism of a liquid metal ion emitter was proposed. The surfaces of a high intensity electron emitter, zirconiated tungsten, was studied. A large amount of nitrogen were found to be trapped by thin zirconium films on the tungsten emitter and react with the tungsten substrate so as to prompt the buildup towards the cap of the emitter.

ISBN: 9798641021065Subjects--Topical Terms:

942542
Condensation.

STUDY OF ALLOY SURFACES AND ION AND ELECTRON EMITTER SURFACES BY THE FIELD ION MICROSCOPE.
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500 $a Source: Dissertations Abstracts International, Volume: 42-07, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 1981.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a An energy compensated, high performance, time-of-flight atom probe with an atomic resolution and an absolute depth calibration has been used to study the surface segregation of the various alloys, NiCu, FeTi, FeP, and the surface ordering of NiCr alloys. The experimental results obtained in the present study agree fairly well with the theoretically calculated predictions and the experimental results obtained by other techniques. The enrichment factors on the surfaces of NiCu alloys were measured and compared to those predicted by the electronic theory for surface segregation. The results show the feasibility of applying the time-of-flight atom probe for the study of the surface segregation of any substitutionally disordered alloy, while techniques have their own instrumental problems. Surface and grain boundary segregation experiments for dilute FeTi alloys and FeP alloys were performed. Because of the micro-analytical capability of the time-of-flight atom probe, the dynamic and the static properties of the dilute alloys could be measured. For the study of the dynamic properties of alloys, nucleation and growth in NiCr alloys were chosen and studied. A magnetic sector atom probe with an energy resolution E/(DELTA)E of 20,000 was used to measure the energy distributions of the various ion species coming from a point source liquid metal gallium ion emitter. A spectroscopic study of the optical emission from the liquid metal emitter was performed. From the energy distribution measurement and the optical emission measurement, a model for the ionization mechanism of a liquid metal ion emitter was proposed. The surfaces of a high intensity electron emitter, zirconiated tungsten, was studied. A large amount of nitrogen were found to be trapped by thin zirconium films on the tungsten emitter and react with the tungsten substrate so as to prompt the buildup towards the cap of the emitter.
590 $a School code: 0176.
650 4 $a Condensation. $3 942542
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791 $a Ph.D.
792 $a 1981
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8129176