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Titel: (Pseudo)binary Antimonides: Insights on Local Ordering and Effective Charge Configurations from 121Sb MAS NMR and Mössbauer Spectroscopies
VerfasserIn: Radzieowski, Mathis
Block, Theresa
Koppe, Jonas
Hansen, Michael Ryan
Pöttgen, Rainer
Janka, Oliver
Sprache: Englisch
Titel: The Journal of Physical Chemistry C
Bandnummer: 125
Heft: 2
Seiten: 1454-1466
Verlag/Plattform: ACS
Erscheinungsjahr: 2021
Freie Schlagwörter: Antimony
Indium Antimonide
Nuclear Magnetic Resonance Spectroscopy
Particulate Matter
Semiconductors
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Binary antimonides of composition MSb (M = Al, Ga, In), RESb (RE = Sc, Y, La), CdSb, RE4Sb3 (RE = Sc, La), and T5Sb4 (T = Nb, Ta) as well as the pseudobinary solid solutions (La0.25M0.75)4Sb3 (M = Sr, Eu) were synthesized from the elements via arc-melting or induction heating and investigated by powder Xray diffraction, magnetic susceptibility, and solid-state 121Sb MAS NMR as well as 121Sb and 151Eu Mössbauer spectroscopic studies. Besides CdSb, all compounds exhibit isolated antimony atoms (i.e., no Sb−Sb bonding), which formally carry a 3-fold negative charge, and only one single crystallographic Sb site is observed. While 121Sb Mössbauer spectroscopic measurements of all X-ray pure phases were possible, not all of these compounds showed detectable 121Sb MAS NMR signals due to Sb located on lower symmetric positions. For the cubic phases with high symmetry, a parameter was constructed on the basis of the 121Sb MAS NMR data to describe the ratio between antimony positions with and without perfect cubic site symmetry, showing that structural disorder is present in all electron-precise compounds of this work. Magnetic measurements of (La0.25Eu0.75)4Sb3 (≡LaEu3Sb3) further indicate divalent europium and antiferromagnetic ordering below TN = 5.4(1) K. The valence state was confirmed by 151Eu Mössbauer spectroscopy. Thus, the gathered 121Sb MAS NMR and 121Sb and 151Eu Mössbauer data were utilized to get a systematic overview regarding the effective charge configuration in terms of the 121Sb chemical shift, formal valence states, and isomer shifts for Sb in the different structures of the studied series of compounds.
DOI der Erstveröffentlichung: 10.1021/acs.jpcc.0c09650
URL der Erstveröffentlichung: https://pubs.acs.org/doi/10.1021/acs.jpcc.0c09650
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-434552
hdl:20.500.11880/38954
http://dx.doi.org/10.22028/D291-43455
ISSN: 1932-7455
1932-7447
Datum des Eintrags: 14-Nov-2024
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Chemie
Professur: NT - Prof. Dr. Guido Kickelbick
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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