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Single‐crystal structure determination of two new ternary bismuthides: Rh 6 Mn 5 Bi 18 and RhMnBi 3
Author(s) -
Kainzbauer Peter,
Richter Klaus W.,
Effenberger Herta Silvia,
Marker Martin C. J.,
Ipser Herbert
Publication year - 2018
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229618009087
Subject(s) - ternary operation , crystallography , crystal structure , materials science , chemistry , computer science , programming language
A study of the ternary Rh–Mn–Bi phase diagram revealed the existence of two new ternary bismuthides, viz. hexarhodium pentamanganese octadecabismuthide (Rh 6 Mn 5 Bi 18 ) and rhodium manganese tribismuthide (RhMnBi 3 ). Their crystal structures represent new structure types. Rh 6 Mn 5 Bi 18 , with a Wyckoff sequence a f 2 g 2 i 5, crystallizes in the tetragonal system (space group P 4 2 / mnm ; Pearson symbol tP 58), and RhMnBi 3 , with a Wyckoff sequence a c g i q , crystallizes in the orthorhombic system ( Cmmm ; oS 20). In the Rh 6 Mn 5 Bi 18 structure, the transition metal atoms are linked into ribbon‐like structural units aligned along the [001] direction, whereas planar sheets are formed in RhMnBi 3 . In both crystal structures, the units formed by the transition metal atoms are enveloped by Bi atoms, which themselves form a loosely bound network. The linkage results in a layer structure for RhMnBi 3 , while in the case of Rh 6 Mn 5 Bi 18 , a three‐dimensional network is formed; the latter, however, contains several areas where Bi…Bi distances suggest van der Waals interactions. Both phases under discussion have analogous structural motifs.