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Complex Intermetallic Compounds: Defects, Disordering, Details

Published online by Cambridge University Press:  26 February 2011

W. Sprengel,
F. Baier,
K. Sato,
X. Y. Zhang and
H.-E. Schaefer
W. Sprengel
Affiliation:
Institute of Theoretical and Applied Physics, Stuttgart University, 70569 Stuttgart, Germany.
F. Baier
Affiliation:
Institute of Theoretical and Applied Physics, Stuttgart University, 70569 Stuttgart, Germany.Physical Metallurgy, Technical University Darmstadt, 64287 Darmstadt, Germany.
K. Sato
Affiliation:
Institute of Theoretical and Applied Physics, Stuttgart University, 70569 Stuttgart, Germany.National Institute of Advanced Industrial Science and Technology, Tsukuba 305–8565, Japan.
X. Y. Zhang
Affiliation:
Institute of Theoretical and Applied Physics, Stuttgart University, 70569 Stuttgart, Germany.Key Laboratory of Metastable Materials Science and Technology, Yanshan University, 066004 Qinhuangdao, P. R. China.
H.-E. Schaefer
Affiliation:
Institute of Theoretical and Applied Physics, Stuttgart University, 70569 Stuttgart, Germany.
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Abstract

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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References

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