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A New Series Of Al-Pd-Based Ordered Icosahedral Quasicrystals And Their Electrical Resistivities

Published online by Cambridge University Press:  10 February 2011

R Tamura ,
T Asao ,
M Tamura ,
S Takeuchif  and
T Shibuya
R Tamura
Affiliation:
Department of Materials Science and Technology, Science University of Tokyo, Noda, Chiba 278–8510, Japan, tamura@rs.noda.sut.ac.jp
T Asao
Affiliation:
Department of Materials Science and Technology, Science University of Tokyo, Noda, Chiba 278–8510, Japan, tamura@rs.noda.sut.ac.jp
M Tamura
Affiliation:
Department of Materials Science and Technology, Science University of Tokyo, Noda, Chiba 278–8510, Japan, tamura@rs.noda.sut.ac.jp
S Takeuchif
Affiliation:
Department of Materials Science and Technology, Science University of Tokyo, Noda, Chiba 278–8510, Japan, tamura@rs.noda.sut.ac.jp
T Shibuya
Affiliation:
Faculty of Engineering, Toyo University, Kawagoe, Saitama 350–8585, Japan
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Abstract

X-ray measurements on samples of Al-Pd-(Fe,Ru,Os) systems with various annealing temperatures and times have been performed in order to gain insights into formations of icosahedral (I) phases and related approximants and to produce single phases of them. As a result, well ordered I phases have been obtained in Al-Pd-(Ru,Os) systems when annealed at 1000 °C for several hours. Formations of the (1/0-1/0-1/0) and the (2/1-2/1-2/1) approximants have been observed in wide compositional ranges in Al-Pd-(Fe,Ru,Os) and Al-Pd-(Ru,Os) systems, respectively. Electrical resistivity measurements of I phases and related approximants are performed as a function of temperature. The resistivity of I phases at room temperature is as high as that of highly resistive I phases such as Al-Pd-Mn and AI-Cu-(Fe,Ru) systems and the resistivity ratio (P12K/P300K) reaches about 1.5 in Al-Pd-Ru I phases. A negative temperature coefficient of the resistivity is observed in (1/0-1/0-1/0) approximants of Al-Pd-(Fe,Ru) systems, which indicates the electronic transport is quite anomalous even in the lowest approximant of the I phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 373
Copyright
Copyright © Materials Research Society 1999

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References

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