EuPtSn2 – A Stannide with Sn2 Dumbbells in a Three‐dimensional [PtSn2]2– Polyanion

The germanides APtGe2 (A = Ca, Sr, Eu) were synthesized from the elements in sealed tantalum ampoules in an induction furnace followed by annealing. The polycrystalline samples were characterized by powder X-ray diffraction (Guinier patterns). The structures of CaPtGe2 (CeRhSn2 type, Cmcm, a = 443.45(3), b = 1593.03(12), c = 886.15(6) pm, wR = 0.0464, 673 F 2 values, 30 variables) and EuPt1.043(5)Ge1.957(5) (CeNiSi2 type, Cmcm, a = 445.23(4), b = 1752.5(2), c = 429.63(4) pm, wR = 0.0415, 389 F 2 values, 19 variables) were refined from single crystal X-ray diffractometer data. One of the germanium site in EuPt1.043(5)Ge1.957(5) showed a small Ge/Pt mixed occupancy. SrPtGe2 (a = 451.13(6), b = 1764.8(2), c = 429.60(5) pm) is isotypic with EuPtGe2. The platinum atoms in both germanides have trigonal prismatic coordination: Pt@Ca4Ge2 and Pt@Eu4Ge2. The germanium substructures differ significantly: Ge2 dumb-bells with 246 and 262 pm Ge–Ge distances in CaPtGe2 versus germanium zig-zag chains (253 pm Ge–Ge distances) and a distorted square net (309 pm Ge–Ge distances) in EuPtGe2. CaPtGe2 and SrPtGe2 are diamagnetic. EuPtGe2 is a Curie–Weiss paramagnet with an experimental magnetic moment of 7.88(1) µB Eu atom−1. The purely divalent character of europium is manifested by a single signal at δ = −11.38(1) mm s−1 in the 151Eu Mössbauer spectrum at 78 K. EuPtGe2 orders antiferromagnetically at T N = 5.4(1) K.

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EuTMg₂ (T = Pd, Ag, Ir, Pt, Au), EuTCd₂ (T = Pd, Pt, Au) and CaRhMg₂ – intermetallic compounds with orthorhombically distorted tetrahedral magnesium (cadmium) substructures

Klenner

Reimann

Pöttgen

2021

Zeitschrift Für Kristallographie - Crystalline Materials

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The magnesium- and cadmium-rich intermetallic phases EuTMg2 (T = Rh, Pd, Ag, Ir, Pt, Au), EuTCd2 (T = Pd, Pt, Au) and CaRhMg2 were synthesized from the elements in sealed niobium or tantalum ampoules and with heat treatments in muffle or induction furnaces. The samples were characterized by powder X-ray diffraction and the structures were refined from single crystal X-ray diffractometer data. EuTMg2 (T = Pd, Ag, Pt, Au) and EuTCd2 (T = Pd, Pt, Au) crystallize with the MgCuAl2 type, space group Cmcm, while EuRhMg2, EuIrMg2 and CaRhMg2 adopt the YSiPd2 type, space group Pnma. The striking crystal chemical motif of both series of compounds are networks of puckered Mg(Cd) hexagons in ABAB stacking sequence that derive from the aristotype AlB2; however, with different tiling. Temperature dependent magnetic susceptibility and 151Eu Mössbauer spectroscopic measurements indicate stable divalent europium. Antiferromagnetic ordering sets in at 20.2 (EuIrMg2), 22.3 (EuPdMg2), 21.3 (EuAgMg2), 10.9 (EuPdCd2) and 15.5 K (EuPtCd2), respectively. The stable antiferromagnetic ground states are substantiated by metamagnetic transitions. The 151Eu isomer shifts show a linear correlation with the valence electron count for the whole series of EuTMg2, EuTCd2, EuTIn2 and EuTSn2 phases.

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EuPtSn₂ – A Stannide with Sn₂ Dumbbells in a Three‐dimensional [PtSn₂]^2– Polyanion

Cited by 4 publications

References 40 publications

Rare earth transition metal plumbides—An update

Rare earth transition metal plumbides—An update

The germanides APtGe₂ (A = Ca, Sr, Eu)

EuTMg₂ (T = Pd, Ag, Ir, Pt, Au), EuTCd₂ (T = Pd, Pt, Au) and CaRhMg₂ – intermetallic compounds with orthorhombically distorted tetrahedral magnesium (cadmium) substructures

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EuPtSn2 – A Stannide with Sn2 Dumbbells in a Three‐dimensional [PtSn2]2– Polyanion

Cited by 4 publications

References 40 publications

Rare earth transition metal plumbides—An update

Rare earth transition metal plumbides—An update

The germanides APtGe2 (A = Ca, Sr, Eu)

EuTMg2 (T = Pd, Ag, Ir, Pt, Au), EuTCd2 (T = Pd, Pt, Au) and CaRhMg2 – intermetallic compounds with orthorhombically distorted tetrahedral magnesium (cadmium) substructures

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Resources

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EuPtSn₂ – A Stannide with Sn₂ Dumbbells in a Three‐dimensional [PtSn₂]^2– Polyanion

The germanides APtGe₂ (A = Ca, Sr, Eu)

EuTMg₂ (T = Pd, Ag, Ir, Pt, Au), EuTCd₂ (T = Pd, Pt, Au) and CaRhMg₂ – intermetallic compounds with orthorhombically distorted tetrahedral magnesium (cadmium) substructures