Quasicrystalline Tenfold Symmetry Order in Boron Compounds
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概要
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We report the first quasicrystalline boride formed in a rapidly-solidified B40Ti12Ru48 alloy, whose diffraction pattern clearly reveals a tenfold rotation axis of decagonal symmetry. The local structure appears to be significantly deviated from an ideal quasicrystal, but the long-range bond-orientational-order restricted by linkages between the robust unit-clusters has successfully generated the apparent 10-fold-symmetric Bragg peaks. This may be attributed to an extreme case of random-tiling quasicrystals, which enable the occurrence of local tiling disorders to account for entropy.
- 2010-07-15
著者
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Yokoyama Yoshihiko
Institute For Materials Research Tohoku University
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Abe Eiji
Department Of Materials Engineering The University Of Tokyo
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Miyazaki Yoshinobu
Department Of Chemistry Fukuoka University Of Education
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Kimura Kaoru
Department Of Advanced Material Science University Of Tokyo
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Yokoyama Yoshihiko
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Okada Junpei
Japan Aerospace Exploration Agency, Tsukuba, Ibaraki 305-8505, Japan
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Abe Eiji
Department of Materials Science and Engineering, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
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Miyazaki Yoshinobu
Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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Kimura Kaoru
Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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