Defect identification in metals and semiconductors by experimental and theoretical investigations concerning positron annihilation with core-electrons - application to materials science problems

Projektinformationen

ID Finanzhilfevereinbarung: FMBI972599

Projekt abgeschlossen

Startdatum 1 Mai 1998

Enddatum 30 April 2000

Finanziert unter

• Specific research and technological development programme in the field of the training and mobility of researchers, 1994-1998

Gesamtkosten € 0,00

EU-Beitrag Keine Daten

Koordiniert durch

Helsinki University of Technology
Finland

Ziel

Research objectives and content
Definite identification of open volume defects becomes more and more important since the investigated systems are becoming more and more complex. This is the case in alloys, compound semiconductors, and fine-grained materials. But a defect identification is possible by correlating theoretical calculations of positron annihilation parameters with experimental data. In these systems we have vacancies on different sublattice eventually decorated with dopant or impurity atoms. Since the positron lifetime gives no direct information about the chemical environment around the annihilation position, Doppler broadening coincidence technique is used for detecting influences from core electrons. The aim of this project is to gain knowledge on the theoretical calculations necessary for the comparison to the experimental data. The routines shall then become modified and applied to materials science problems.
Training content (objective, benefit and expected impact)
Objective: Widening of theoretical knowledge; becoming acquaintened to the calculation routines developed in Helsinki and becoming able to modify the computing routines; transfer of knowledge to European positron groups for better preparation in global competition. Benefit: Unique possibility to obtain a well founded knowledge on theoretical calculations of positron annihilation parameters. Combination of theoretical calculations and experimental data is a much more powerful tool in defect identification than experiments alone. Expected Impact: Unique defect identification via their chemical environment possible - keeping lead over american and asian research groups.
Links with industry / industrial relevance (22)
No /Daimler-Benz Aerospace Airbus GmbH (DASA) (precipitation hardened alloys; correlation between precipitation sequence and atomic defects)

Wissenschaftliches Gebiet

• natural sciences › physical sciences › electromagnetism and electronics › semiconductivity
• natural sciences › mathematics › applied mathematics › mathematical model

Programm/Programme

• FP4-TMR - Specific research and technological development programme in the field of the training and mobility of researchers, 1994-1998

Thema/Themen

• 0302 - Post-doctoral research training grants
• TP09 - Condensed Matter - Mechanical and Thermal Properties

Aufforderung zur Vorschlagseinreichung

Data not available

Finanzierungsplan

RGI - Research grants (individual fellowships)

Koordinator

Helsinki University of Technology

• EU-Beitrag: Keine Daten
• Adresse: 1,Otakaari ; 02015 Espoo ; Finnland
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Beteiligte (1)

Not available

Deutschland

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