Magnetic Properties of the RE2Pt6X15 (RE = Y, La–Nd, Sm, Gd–Lu; X = Al, Ga) Series. Issue 13 (12th March 2020)

• Record Type: Journal Article
• Authors: Radzieowski, Mathis; Stegemann, Frank; Janka, Oliver
• Is Part Of: European journal of inorganic chemistry. Issue 13(2020)
• Page Start: 1199
• Page End: 1210
• Publication Date: 2020-03-12
• Subjects: Modulated crystal structure -- Intermetallics -- Aluminum -- Gallium -- Platinum -- Magnetic properties; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201901332
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : The members of the RE 2 Pt6 Al15 ( RE = Ce–Nd, Sm, Gd–Yb) and RE 2 Pt6 Ga15 ( RE = Y, La–Nd, Sm, Gd–Lu) series have been synthesized from the elements via arc‐melting followed by annealing in an induction furnace. Isotypism of Ho2 Pt6 Al15 with orthorhombic (3+1)D commensurately modulated Sc2 Pt6 Al15 [ Cmcm ( α, 0, 0)0 s 0, α = 2/3] was observed from single‐crystal diffraction data. The diffraction pattern shows the same satellite reflections pattern as the prototype, therefore the same modulated superstructure was refined. Full ordering of the Pt and Al atoms within the [Pt6 Al15 ] δ – polyanion was observed. The lattice parameters of the averaged hexagonal structure were refined from powder X‐ray diffraction experiments and agree well with previous reports on these compounds. The X‐ray pure polycrystalline samples of both series were studied with respect to their magnetic properties. The susceptibility data of all investigated compounds show experimental magnetic moments close to the free ion values of the RE 3+ cations and antiferro‐/ferrimagnetic ordering at low temperatures with Curie temperatures up to T C = 16.8(1) K for Gd2 Pt6 Ga15 . Both, Sm2 Pt6 Al15 and Sm2 Pt6 Ga15 show the typical van Vleck type behavior along with antiferromagnetic ordering at a Néel temperature of T N = 4.5(1) K (Al) and ferrimagnetic ordering at T C = 6.5(1) K (Ga). Yb2 Pt6 Al15 exhibits ytterbium in the trivalent oxidation state, while for Yb2 Pt6 Ga15 a divalent state of the Yb atoms was observed. Abstract : The members of the RE 2 Pt6 Al15 and RE 2 Pt6 Ga15 series have been (re)synthesized to investigate their crystal structures and basic magnetic properties, since only some of these compounds have been described and investigated before.