The crystal structure of La₂Fe₂₅P₁₂

Abstract

The new compound La

Lanthanum Nickel Silicides with the General Formula La(n+1)(n+2)Nin(n-1)+2Sin(n+1) and Other Series of Hexagonal Structures with Metal:Metalloid Ratios Close to 2:1

“…Most of these are ternary compounds with two kinds of metal atoms: large, electropositive metals, e.g., lanthanoids, actinoids, and early transition elements, which we designate with the letter R in the present paper, and late transition metals, here designated with T . The most common metalloids M are silicon and phosphorus. ,,− In all of these structures almost all atoms are located on two mirror planes, which extend perpendicular to the short translation period, and almost all metalloid atoms are situated in trigonal prisms formed by the R and/or T atoms.…”

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.…”

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.…”