Fig. 3 | Nature Communications

Fig. 3

From: Polyhydride CeH9 with an atomic-like hydrogen clathrate structure

Fig. 3

Crystal structure determination of Ce polyhydrides. a The crystal structure of CeH4-I4/mmm. b The crystal structure of CeH9-P63/mmc. c The extended H network in CeH9-P63/mmc. d The H29 cage in CeH9-P63/mmc. Large brown and small green spheres represent Ce and H atoms, respectively. e The evolution of nearest-neighbor H–H distances in polyhydrides and atomic metallic H2 as a function of pressure. These data were gained in previous work of H3S9, FeH519, LaH1012, CeH4-I4/mmm, and CeH9-P63/mmc (this work) and the calculation of atomic metallic hydrogen (solid curve for ref. 19 and dash curve from ref. 12)

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