Rare Earth-rich Magnesium Compounds RE<sub>4</sub>PdMg (RE=Y,Sm,Gd) and RE<sub>4</sub>PtMg (RE = Y, Nd, Sm, Gd)

Tuncel, Selcan; Chevalier, Bernard; Pöttgena, Rainer

doi:10.1515/znb-2008-0520

Cited by 14 publications

(1 citation statement)

References 9 publications

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“…Of the latter, over 200 compounds were reported for different combinations of rare-earth and transition metals. Besides the respective aluminum compounds, ,− the isostructural indium, ,, cadmium ,,− and magnesium ,− representatives have also been reported. Of these, e.g., Eu 4 PdMg exhibits exceptional good magnetocaloric properties in a large temperature window .…”

Section: Introductionmentioning

confidence: 99%

Formation of the Sub-oxide Sc₄Au₂O_1–x and the Drastically Negative ²⁷Al NMR Shift in Sc₂Al

et al. 2023

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During attempts to synthesize Sc4AuAl in the cubic Gd4RhIn-type structure, the solid solution Sc2Au0.5Al0.5 in the PbCl2-type structure formed instead. Subsequently, the solid solution Sc2Au1–x Al x was investigated with respect to its existence range along with the structure types formed for different compositions with x = 0, 0.25, 0.5, 0.75, and 1. According to X-ray powder diffraction studies, Sc2Al and nominal Sc2Au0.25Al0.75 crystallized in the hexagonal Ni2In-type structure (P63/mmc), while Sc2Au0.5Al0.5, Sc2Au0.75Al0.25, and Sc2Au were found to crystallize in the orthorhombic PbCl2-type structure (Pnma). The crystal structures of Sc2Au and Sc2Au0.59(1)Al0.41(1) were refined from single-crystal data (Sc2Au: a = 648.0(1), b = 467.2(1), c = 835.2(2) pm, wR2 = 0.0382, 535 F 2 values, 25 variables; Sc2Au0.59(1)Al0.41(1): a = 632.48(5), b = 472.16(3), c = 848.67(6) pm, wR2 = 0.0484, 540 F 2 values, 21 variables). Contamination with air during the synthesis of Sc2Au led to the discovery of a compound adopting the cubic W4Co2C-type structure (stuffed cubic Ti2Ni type). Using Sc2O3 as a defined oxygen source led to samples with high amounts of Sc4Au2O1–x . All intermetallic compounds exhibited Pauli paramagnetic behavior in the investigated temperature range of 2.1 to 300 K, and no superconductivity was observed at low temperatures and low fields. Sc2Au and Sc2Al were investigated by 27Al and 45Sc solid-state NMR investigations. For Sc2Al, one signal was found in the 27Al NMR spectra in line with the crystal structure; however, an extremely negative resonance shift of δ = −673 ppm was observed. In both compounds, two Sc resonances were observed, in line with the proposed crystal structure. Finally, it was observed that the stability of Sc2Au in air is limited. This was investigated via thermal analysis and (temperature-dependent) powder X-ray diffraction. DFT calculations helped in assessing charge analysis, electronic properties, and chemical bonding.

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Section: Introductionmentioning

confidence: 99%

Formation of the Sub-oxide Sc₄Au₂O_1–x and the Drastically Negative ²⁷Al NMR Shift in Sc₂Al

et al. 2023

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ChemInform Abstract: Rare Earth‐Rich Magnesium Compounds RE₄PdMg (RE: Y, Sm, Gd) and RE₄PtMg (RE: Y, Nd, Sm, Gd).

Tuncel¹,

Chevalier²,

Poettgen³

2008

ChemInform

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Rare‐Earth‐Rich Magnesium Compounds RE₂₃Rh₇Mg₄ (RE = La, Ce, Pr, Nd, Sm, Gd) with Tetrahedral Mg₄ Clusters

Linsinger

Tuncel

Hermes

et al. 2009

Zeitschrift anorg allge chemie

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The rare earth‐rich compounds RE23Rh7Mg4 (RE = La, Ce, Pr, Nd, Sm, Gd) were prepared by induction‐melting the elements in sealed tantalum tubes. The new compounds were characterized by X‐ray powder diffraction. They crystallize with the hexagonal Pr23Ir7Mg4 type structure, space group P63mc. The structures of La23Rh7Mg4 (a = 1019.1(1), c = 2303.7(4) pm, wR2 = 0.0827, 1979 F2 values, 69 variables), Nd23Rh7Mg4 (a = 995.4(2), c = 2242.3(5) pm, wR2 = 0.0592, 2555 F2 values, 74 variables) and Gd23Rh6.86(5)Mg4 (a = 980.5(2), c = 2205.9(5) pm, wR2 = 0.0390, 2083 F2 values, 71 variables) were refined from single crystal X‐ray diffractometer data. The three crystallographically different rhodium atoms have trigonal prismatic rare earth coordination with short RE–Rh distances (283–300 pm in Nd23Rh7Mg4). The prisms are condensed via common edges, leading to a rigid three‐dimensional network in which isolated Mg4 tetrahedra (312–317 pm Mg–Mg in Nd23Rh7Mg4) are embedded. Temperature dependent magnetic susceptibility data of Ce23Rh7Mg4 indicate Curie‐Weiss behavior with an experimental magnetic moment of 2.52(1) μB/Ce atom, indicative for stable trivalent cerium. Antiferromagnetic ordering is evident at 2.9 K.

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Rare Earth-rich Magnesium Compounds RE₄PdMg (RE=Y,Sm,Gd) and RE₄PtMg (RE = Y, Nd, Sm, Gd)

Cited by 14 publications

References 9 publications

Formation of the Sub-oxide Sc₄Au₂O_1–x and the Drastically Negative ²⁷Al NMR Shift in Sc₂Al

Formation of the Sub-oxide Sc₄Au₂O_1–x and the Drastically Negative ²⁷Al NMR Shift in Sc₂Al

ChemInform Abstract: Rare Earth‐Rich Magnesium Compounds RE₄PdMg (RE: Y, Sm, Gd) and RE₄PtMg (RE: Y, Nd, Sm, Gd).

Rare‐Earth‐Rich Magnesium Compounds RE₂₃Rh₇Mg₄ (RE = La, Ce, Pr, Nd, Sm, Gd) with Tetrahedral Mg₄ Clusters

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Rare Earth-rich Magnesium Compounds RE4PdMg (RE=Y,Sm,Gd) and RE4PtMg (RE = Y, Nd, Sm, Gd)

Cited by 14 publications

References 9 publications

Formation of the Sub-oxide Sc4Au2O1–x and the Drastically Negative 27Al NMR Shift in Sc2Al

Formation of the Sub-oxide Sc4Au2O1–x and the Drastically Negative 27Al NMR Shift in Sc2Al

ChemInform Abstract: Rare Earth‐Rich Magnesium Compounds RE4PdMg (RE: Y, Sm, Gd) and RE4PtMg (RE: Y, Nd, Sm, Gd).

Rare‐Earth‐Rich Magnesium Compounds RE23Rh7Mg4 (RE = La, Ce, Pr, Nd, Sm, Gd) with Tetrahedral Mg4 Clusters

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Rare Earth-rich Magnesium Compounds RE₄PdMg (RE=Y,Sm,Gd) and RE₄PtMg (RE = Y, Nd, Sm, Gd)

Formation of the Sub-oxide Sc₄Au₂O_1–x and the Drastically Negative ²⁷Al NMR Shift in Sc₂Al

Formation of the Sub-oxide Sc₄Au₂O_1–x and the Drastically Negative ²⁷Al NMR Shift in Sc₂Al

ChemInform Abstract: Rare Earth‐Rich Magnesium Compounds RE₄PdMg (RE: Y, Sm, Gd) and RE₄PtMg (RE: Y, Nd, Sm, Gd).

Rare‐Earth‐Rich Magnesium Compounds RE₂₃Rh₇Mg₄ (RE = La, Ce, Pr, Nd, Sm, Gd) with Tetrahedral Mg₄ Clusters