Synthesis and structure determination of AgScP2Se6, AgErP2Se6 and AgTmP2Se6
Résumé
AgScP2Se6, AgErP2Se6 and AgTmP2Se6 were obtained by high temperature reaction of stoichiometric amounts of the elements in evacuated silica ampoules. They crystallize in the space-group P 1c, Z = 2, with the lattice constants a = 6.463 (1) Å, c = 13.349 (1) Å (AgScP2Se6), a = 6.578 (1) Å, c = 13.410 (2) Å (AgErP2Se6), and a = 6.567 (1) Å, c = 13.422 (1) Å (AgTmP2Se6). The crystal structures of AgScP2Se6 and AgErP2Se6 were refined from merohedrally twinned crystals. No twinning was observed for AgTmP2Se6. The crystal structures are isotypic and can be described as a variant of the CdI2 structure type. Thus, selenium atoms are hexagonally close packed. The octahedral voids of every second layer are occupied by Ag, M3+, and P2 dumbbells in an ordered fashion. The crystal structures are isotypic to AgScP2S6 and AgInP2S6.
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