Pressure-Induced Phase Transitions in the Cd-Yb Periodic Approximant to a Quasicrystal

The phase study of a Cd-Yb 1/1 approximant crystal over a wide pressure and temperature range is crucial for the comparison study between periodic and quasiperiodic crystals. The Cd{sub 4} tetrahedra, the most inner part of the atomic clusters, exhibited various structural ordering in the orientatio...

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Bibliographic Details
Published in:Physical review letters 2006-03, Vol.96 (10)
Main Authors: Watanuki, Tetsu, Machida, Akihiko, Ikeda, Tomohiro, Aoki, Katsutoshi, Kaneko, Hiroshi, Shobu, Takahisa, Sato, Taku J., Tsai, An Pang, SORST, Japan Science and Technology Agency, Kawaguchi, Saitama, 332-0012
Format: Article
Language:English
Subjects:
ATOMIC CLUSTERS
CADMIUM ALLOYS
CRYSTALS
MATERIALS SCIENCE
PERIODICITY
PHASE STUDIES
PHASE TRANSFORMATIONS
PRESSURE RANGE GIGA PA
TEMPERATURE RANGE 0065-0273 K
YTTERBIUM ALLOYS
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Summary:The phase study of a Cd-Yb 1/1 approximant crystal over a wide pressure and temperature range is crucial for the comparison study between periodic and quasiperiodic crystals. The Cd{sub 4} tetrahedra, the most inner part of the atomic clusters, exhibited various structural ordering in the orientation sensitive to pressure and temperature. Five ordered phases appeared in a P-T span up to 5.2 GPa and down to 10 K. The propagation direction of ordering alternated from [110] to at about 1.0 GPa and again to [110] at 3.5-4.3 GPa. The primarily ordered phases that appeared by cooling to 210-250 K between 1.0-5.2 GPa further transformed to finely ordered ones at 120-155 K. Besides the original short-range type interaction, a long-range type interaction was likely developed under pressure to lead to the primary ordering of Cd{sub 4} tetrahedra. Coexistence of these interactions is responsible for the complicated phase behavior.
ISSN:0031-9007
1079-7114
DOI:10.1103/PHYSREVLETT.96.1