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ScFe 5 P 3 , ScRu 6 P 4 , U 2 Mo 30 P 19 , and Other Ternary Phosphides with a Metal to Phosphorus Ratio close to 2:1
Author(s) -
Jeitschko Wolfgang,
Albering Jörg H.,
Brink Reinhold,
JakubowskiRipke Ursula,
Reinbold Elke J.
Publication year - 2014
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201400267
Subject(s) - crystal structure , crystallography , hexagonal crystal system , ternary operation , single crystal , superstructure , materials science , structure type , formula unit , tin , tantalum , chemistry , metallurgy , physics , computer science , thermodynamics , programming language
The title compounds and several other new ternary phosphides – all with closely related crystal structures – were prepared mostly by using elemental tin as a flux. ScFe 5 P 3 , Sc(Ta 0.18 Fe 0.82 )Fe 4 P 3 , and ZrFe 5 P 3 are isotypic with YCo 5 P 3 . The crystal structure of the tantalum containing compound was determined from single‐crystal X‐ray counter data: space group Pnma , a = 1212.5(2) pm, b = 363.0(2) pm, c = 1052.2(2) pm with a residual R = 0.036 for 505 unique structure factors and 30 variable parameters. The Ta atoms occupy only that Fe site with the highest coordination number. The crystal structure of ScRu 6 P 4 (α‐UCr 6 P 4 type) was refined from single‐crystal data: P $\bar{6}$ m 2, a = 690.0(2) pm, c = 362.5(3) pm; R = 0.023 for 226 F o and 15 variables. The same structure was also found from Guinier powder data for ErRu 6 P 4 and ZrCr 6 P 4 . However, single‐crystal film data for the latter compound suggest a superstructure with a doubling of the hexagonal axis. The new compound Nd 2 Ru 12 P 7 is shown from Guinier powder data to crystallize with a hexagonal Zr 2 Fe 12 P 7 type structure. X‐ray powder data also confirm Zr 2 Ru 12 P 7 and SmCo 3 P 2 to crystallize with Zr 2 Fe 12 P 7 and HoCo 3 P 2 type structures, respectively. The crystal structure of the phosphide U 2 Cr 30 P 19 is confirmed to be isotypic with Zr 2 Cr 30 P 19 . The same structure was found for the new compound U 2 Mo 30 P 19 . The crystal structures of these and other compounds with a metal to phosphorus ratio close to 2:1 are briefly discussed including that of LiCo 6 P 4 .