Complex Intermetallic Compounds: Defects, Disordering, Details


A short overview will be given on the thermodynamics of the formation of thermal defects in intermetallic aluminides. We focus on thermal vacancies studied by the specific techniques of positron annihilation and time-differential dilatometry and discuss the results together with self-diffusion data. We then demonstrate that these techniques can be employed for studying vacancies in compound semiconductors specifically. Furthermore, structural order-disorder phase transitions can be investigated from an atomistic point of view by making use of positron annihilation as shown in the exemplary case of decagonal Al-Ni-Co quasicrystals.

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H.-E. Schaefer is indebted to Prof. Y. Shirai for his outstanding hospitality during the teaching and research period at Osaka University, Japan. The financial support of the 21st Century COE Program “Center of Excellence for Advanced Structural and Functional Materials Design”, Osaka University, Japan is acknowledged.

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Sprengel, W., Baier, F., Sato, K. et al. Complex Intermetallic Compounds: Defects, Disordering, Details. MRS Online Proceedings Library 842, 73–82 (2004).

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