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Titel: Structural, Physical, Theoretical and Spectroscopic Investigations of Mixed‐Valent Eu2Ni8Si3 and Its Structural Anti‐Type Sr2Pt3Al8
VerfasserIn: Stegemann, Frank
Block, Theresa
Klenner, Steffen
Zhang, Yuemei
Fokwa, Boniface P. T.
Doerenkamp, Carsten
Eckert, Hellmut
Janka, Oliver
Sprache: Englisch
Titel: European Journal of Inorganic Chemistry
Bandnummer: 2021
Heft: 37
Seiten: 3832–3845
Verlag/Plattform: Wiley
Erscheinungsjahr: 2021
Freie Schlagwörter: Intermetallics
Magnetism
Mößbauer spectroscopy
NMR spectroscopy
X-ray diffraction
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Eu2Ni8Si3 and its anti-type representative Sr2Pt3Al8 were synthesized from the elements. They crystallize in the tetragonal crystal system with space group P42/nmc and with lattice parameters of a=997.9(1) and c=747.6(1) pm (Eu2Ni8Si3) as well as a=1082.9(2) and c=823.3(2) pm (Sr2Pt3Al8). Both compounds were investigated via single crystal X-ray diffraction, indicating slight Si/Ni mixing for the silicide. Sr2Pt3Al8 exhibits a temperature independent magnetic susceptibility, suggesting superimposed dia- and Pauli-paramagnetic contributions. The independent Al and Pt sites of the platinide were further characterized by 27Al and 195Pt solid-state NMR spectroscopy, which were assigned with the help of electronic structure calculations. ICOHP calculations and Bader charges were used to analyze the bonding situation. Eu2Ni8Si3 in contrast is paramagnetic with a ferromagnetic transition at TC= 46.9(2) K and exhibits an effective magnetic moment of μeff= 6.61(1) μB per Eu atom. The latter is in line with an intermediate valence that was further proven by 151Eu Mößbauer spectroscopic investigations. At 300 K, the refined Eu2+/Eu3+ ratios are 60%/40%, at 78 K 62% and 38% (Eu2+/Eu3+) are observed, being in line with the ratio deduced from the magnetic susceptibility. Finally, at 6 K a ratio of 68% Eu2+ and 32% Eu3+ was observed. Below the Curie temperature, the Eu2+ signal shows a full magnetic hyperfine splitting, with an internal magnetic field value of B0=28.4 T.
DOI der Erstveröffentlichung: 10.1002/ejic.202100564
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-348006
hdl:20.500.11880/31824
http://dx.doi.org/10.22028/D291-34800
ISSN: 1099-0682
1434-1948
Datum des Eintrags: 6-Okt-2021
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Chemie
Professur: NT - Keiner Professur zugeordnet
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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