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Philosophical Magazine Volume 86, 2006 - Issue 3-5: Proceedings of the 9th International Conference on Quasicrystals, 22–26 May 2005, Part 1. Guest Editors: Cynthia J. Jenks, Daniel J. Sordelet and Patricia Thiel
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Original Articles

The study of the binary quasicrystal Cd17Ca3 and its 1/1 approximant Cd6Ca by positron annihilation spectroscopy

Y. Takagiwa Department of Physics, Tokyo Gakugei University, Nukuikitamachi 4-1-1, Koganei-shi, Tokyo 184-0051, JapanCorrespondence[email protected]
,
T. Akiyama Department of Physics, Tokyo Gakugei University, Nukuikitamachi 4-1-1, Koganei-shi, Tokyo 184-0051, Japan
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I. Kanazawa Department of Physics, Tokyo Gakugei University, Nukuikitamachi 4-1-1, Koganei-shi, Tokyo 184-0051, Japan
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K. Sato Department of Environmental Science, Tokyo Gakugei University, Nukuikitamachi 4-1-1, Koganei-shi, Tokyo 184-0051, Japan
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H. Murakami Department of Environmental Science, Tokyo Gakugei University, Nukuikitamachi 4-1-1, Koganei-shi, Tokyo 184-0051, Japan
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Y. Kobayashi National Institute of Advanced Industrial Science and Technology (AIST), ?, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan
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R. Tamura Department of Materials and Science and Technology, Tokyo University of Science, Noda, Chiba 278-8501, Japan
&
S. Takeuchi Department of Materials and Science and Technology, Tokyo University of Science, Noda, Chiba 278-8501, Japan
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Pages 513-517 | Received 13 May 2005, Accepted 05 Jul 2005, Published online: 21 Aug 2006
 
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Abstract

The positron annihilation lifetime measurements for the Cd17Ca3 quasicrystal and its 1/1 Cd6Ca approximant were carried out at 300 K. The observed lifetime of the Cd17Ca3 quasicrystal is close to that of the 1/1 Cd6Ca approximant, implying the existence of the same type of structural vacancies. The temperature variations in the positron lifetime were investigated in the temperature region from 10 to 300 K for the Cd17Ca3 quasicrystal annealed at 773 K and the Cd17Ca3 quasicrystal cooled in the furnace. We found clear differences between both the absolute value and the temperature gradient of the positron lifetimes of the two quasicrystals. The results will be discussed in terms of the fluctuation in the four-Cd tetrahedron inside the 20-Cd dodecahedron between two quasicrystals.

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