V - Positron Annihilation in Halle
V - Positron Annihilation in Halle
V - Positron Annihilation in Halle
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Po<strong>in</strong>t defects determ<strong>in</strong>e properties of materials<br />
Galliumphosphide<br />
• Po<strong>in</strong>t defects determ<strong>in</strong>e<br />
electronic and optical<br />
properties<br />
without vacancies with 00.001% 001% vacancies<br />
• electric conductivity<br />
strongly <strong>in</strong>fluenced<br />
transparent opaque<br />
1 vacancy <strong>in</strong> 100000 atoms<br />
• Po<strong>in</strong>t defects are generated by irradiation, by plastic deformation or by<br />
diffusion, …<br />
• Metals <strong>in</strong> high radiation environment -> > formation of voids -> > embrittlement<br />
• -> Properties of vacancies and other po<strong>in</strong>t defects must be known<br />
• Analytical tools are needed to characterize po<strong>in</strong>t defects<br />
Mart<strong>in</strong>-Luther-Universität <strong>Halle</strong><br />
1 cm
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