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- W2053218113 abstract "Abstract The thermal decomposition of terbium tetrafluoride was already used for the synthesis of mixed-valence terbium fluorides such as KTb 3 F 12 or K 2 Tb 4 F 17 . In this paper, new mixed-valence terbium (III/IV) fluorides with formula Rb 2 AlTb 3 F 16 and RbAl 2 Tb 4 F 22 with a statistical distribution between Tb(III) and Tb(IV) are presented. The Rb 2 AlTb 3 F 16 compound which crystallizes in the hexagonal system, space group P 6 3 / mmc (n° 194) with unit cell parameters a =7.556(6) A and c =12.397(3) A exhibits an uncommon structural unit [Tb 3 F 22 ] 11− resulting from the association of three monocapped square antiprisms TbF 9 by sharing edges about a common corner. The RbAl 2 Tb 4 F 22 compound crystallizes in the tetragonal system, space group I 4/ mmm (n° 139) with unit cell parameters a =10.662(2) A and c =6.911(3) A. The structure is built of chains of edge-sharing TbF 8 dodecahedra. These chains arranged in a tetragonal packing are further held together by sharing vertices to form the three-dimensional framework. This polyhedral linking delimits two kinds of channels parallel to the tetragonal c -axis. The first ones, star shaped, are occupied by isolated zigzag chains of trans corner-sharing [AlF 6 ] 3− octahedra whereas the second ones accommodate the Rb + ions in 8-coordination." @default.
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- W2053218113 date "2004-07-01" @default.
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- W2053218113 title "Synthesis and crystal structures of new mixed-valence terbium (III/IV) fluorides with a random distribution between Tb3+ and Tb4+" @default.
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- W2053218113 doi "https://doi.org/10.1016/j.jallcom.2003.11.140" @default.
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