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Thermal Expansion And Grüneisen Parameters Of Quasicrystals

Published online by Cambridge University Press:  10 February 2011

K. Edagawa ,
K. Kajiyama  and
S. Takeuchi
K. Edagawa
Affiliation:
Institute of Industrial Science, The University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan, [email protected]
K. Kajiyama
Affiliation:
Institute of Industrial Science, The University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan, [email protected]
S. Takeuchi
Affiliation:
Departmentof Materials Science and Technology, Science University of Tokyo, Noda, Chiba 278, Japan
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Abstract

To investigate anharmonic phonon properties, thermal expansion measurements have been performed for icosahedral (i-) Al-Pd-Mn and decagonal (d-) Al-Cu-Co quasicrystals by X-ray diffractometry in the temperature range between 100 and 800K. The linear thermal expansion coefficient α(T) of i-Al-Pd-Mn is 1.1 × 10−5K−1 at 300K, which is about a half of that of pure Al phase. The measured α(T) of d-Al-Cu-Co coincides almost completely with that of i-Al-Pd- Mn and no appreciable anisotropy was detected between the tenfold periodic direction and a quasiperiodic direction perpendicular to it. The Grfneisen parameter γ(T), has been evaluated from the measured α(T) using the data of lattice specific heat and elastic moduli previously reported. The γ(T) values for the two phases are comparable to those for conventional metallic crystals and almost constant over the temperature range studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 403
Copyright
Copyright © Materials Research Society 1999

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References

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