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

Información del proyecto

Identificador del acuerdo de subvención: FMBI972599

Proyecto cerrado

Fecha de inicio 1 Mayo 1998

Fecha de finalización 30 Abril 2000

Financiado con arreglo a

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

Coste total

Sin datos

Aportación de la UE

Sin datos

Coordinado por

Helsinki University of Technology
Finland

Objetivo

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)

Ámbito científico (EuroSciVoc)

• ciencias naturales › ciencias físicas › electromagnetismo y electrónica › dispositivo semiconductor
• ciencias naturales › matemáticas › matemáticas aplicadas › modelo matemático

Programa(s)

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

Tema(s)

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

Convocatoria de propuestas

Datos no disponibles

Régimen de financiación

RGI - Research grants (individual fellowships)

Coordinador

Helsinki University of Technology

• Aportación de la UE: Sin datos
• Dirección: 1,Otakaari ; 02015 Espoo ; Finlandia
• Coste total: Sin datos

Participantes (1)

Not available

Alemania

• Aportación de la UE: Sin datos
• Coste total: Sin datos