The Ternary Uranium Transition Metal Phosphides UV₅P₃, UCr₅P₃, and UMn₅P₃

Abstract

The title compounds were prepared from prereacted samples of the elemental components by arc-melting. UCr5P3 was also obtained from a tin flux. UV5P3 and UCr5P3 crystallize with a new structure type, which was determined from X -ray data of a twinned crystal of UCr5P3 :P21/m, a = 959.1(2), b = 370.95(6), c = 696.7(1) pm , β = 100.05(3)°, Z = 2, R = 0.030 for 827 structure factors and 29 variable parameters. UMn5P3 is isotypic with YCo5P3. The structure was refined to a residual of R = 0.054 for 455 structure factors and 28 variables. UCr5P3 has a relatively high, almost temperature independent paramagnetic susceptibility as is frequently observed for metallic uranium compounds. The crystal structures of these phosphides are discussed together with those of other phosphides and silicides of similar composition.

The Metal Flux: A Preparative Tool for the Exploration of Intermetallic Compounds

“…Ternary rare‐earth and actinoid transition‐metal phosphides prepared by the tin‐flux technique with iron and nickel as the transition‐metal components include the compounds ScFe 4 P 2 123 and ThFe 4 P 2 ,124 which crystallize with two different structure types, Th 5 Fe 19 P 12 124 and isotypic Yb 5 Ni 19 P 12 ,125 ThFe 5 P 3 ,126 La 2 Fe 25 P 12 ,127 Th 11 Ni 25 P 20 and isotypic U 11 Ni 25 P 20 ,128 Yb 9 Ni 26 P 12 ,129 and YbNi 5 P 3 129. With chromium as the transition‐metal component the compounds UCr 5 P 3 ,130 A 2 Cr 30 P 19 ( A =U and Zr),131, 132 and Zr 6 Cr 60 P 39 133 were prepared in well‐crystallized form from a tin flux. For the syntheses of corresponding molybdenum compounds (e.g.…”

Metallische Schmelzen – Reaktionsmedien zur Präparation intermetallischer Verbindungen

“…Folgende ternäre Seltenerdmetall‐ und Actinoid‐Übergangsmetall‐Phosphide mit Eisen oder Nickel als Übergangsmetallkomponente wurden aus Zinnschmelzen erhalten: ScFe 4 P 2 123 und ThFe 4 P 2 ,124 die mit zwei unterschiedlichen Strukturtypen kristallisieren, Th 5 Fe 19 P 12 124 und die isotype Verbindung Yb 5 Ni 19 P 12 ,125 ThFe 5 P 3 ,126 La 2 Fe 25 P 12 ,127 Th 11 Ni 25 P 20 und die isotype Verbindung U 11 Ni 25 P 20 ,128 Yb 9 Ni 26 P 12 129 und YbNi 5 P 3 129. Mit Chrom als Übergangsmetallkomponente wurden aus Zinnschmelzen in gut kristallisierter Form die Phosphide UCr 5 P 3 ,130 A 2 Cr 30 P 19 ( A =U und Zr)131, 132 und Zr 6 Cr 60 P 39 133 erhalten. Zur Herstellung der entsprechenden Molybdänverbindungen (z.…”

Rare-Earth Manganese Copper Phosphides REMnCu4P3 (RE = Gd–Ho): The First Quaternary Ordered Variants of the YCo5P3-Type Structure

“…They are the first well-characterized examples of quaternary ordered representatives of the orthorhombic YCo 5 P 3 -type structure . Previous examples of this structure type were restricted to ternary phases, mostly phosphides (REFe 5 P 3 , RECo 5 P 3 , ThFe 5 P 3 , and UMn 5 P 3 ) ,,− but also a few arsenides (YCo 5 As 3 ), germanides (TbMn 5 Ge 3 ), and indides [AMg 5 In 3 (A = Sr, Ba) and Ca 2 Au 3 In 4 having a different site ordering]. , The possibility for more complex ordering was already suggested with the initial discovery of YCo 5 P 3 itself several decades ago (through the proposal of a compound such as YRhCo 4 P 3 ), but no evidence had been forthcoming . Site ordering in the closely related hexagonal Zr 2 Fe 12 P 7 -type structure was recently demonstrated in the quaternary phosphides RE 2 Mn 3 Cu 9 P 7 , which forms for a much wider range of RE members (La–Nd, Sm, and Gd–Dy) .…”