(IMAGE)

Yokohama National University

Caption

The HS-I, CS-I, and CS-II structures of hydrate correspond to the Z, A15, and C15 phases of the Frank-Kasper phase, respectively. With the discovery of HS-I, the primitive structures at the three vertices are all in place. Derivative structures arise from cage deformation. Polyhedron: green, 14-hedron; red, 15-hedron. Plot: gray, mixed phases found in alloys.

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Yokohama National University

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