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Towards a mechanistic understanding of the sol-gel syntheses of ternary carbides

Siebert, Jan P. ; Juelsholt, Mikkel ; Günzing, Damian ; Wende, Heiko ; Ollefs, Katharina ; Birkel, Christina S. (2022)
Towards a mechanistic understanding of the sol-gel syntheses of ternary carbides.
In: Inorganic Chemistry Frontiers, 9 (7)
doi: 10.1039/D2QI00053A
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Sol-gel chemistry, while being extremely established, is to this day not fully understood, and much of the underlying chemistry and mechanisms are yet to be unraveled. Here, we elaborate on the sol-gel chemistry of Cr2GaC, the first layered ternary carbide belonging to the MAX phase family to ever be synthesized using this wet chemical approach. Leveraging a variety of both in- and ex situ characterization techniques, including X-ray and neutron powder diffraction, X-ray absorption fine structure analyses, total scattering analyses, and differential scanning calorimetry coupled with mass spectrometry, in-depth analyses of the local structures and reaction pathways are elucidated. While the metals first form tetrahedrally and octahedrally coordinated oxidic structures, that subsequently grow and crystallize into oxides, the carbon source citric acid sits on a separate reaction pathway, that does not merge with the metals until the very end. In fact, after decomposing it remains nanostructured and disordered graphite until the temperature allows for the reduction of the metal oxides into the layered carbide. Based on this, we hypothesize that the method is mostly applicable to systems where the needed metals are reducible by graphite around the formation temperature of the target phase.

Typ des Eintrags: Artikel
Erschienen: 2022
Autor(en): Siebert, Jan P. ; Juelsholt, Mikkel ; Günzing, Damian ; Wende, Heiko ; Ollefs, Katharina ; Birkel, Christina S.
Art des Eintrags: Bibliographie
Titel: Towards a mechanistic understanding of the sol-gel syntheses of ternary carbides
Sprache: Englisch
Publikationsjahr: 18 Februar 2022
Verlag: The Royal Society of Chemistry
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Inorganic Chemistry Frontiers
Jahrgang/Volume einer Zeitschrift: 9
(Heft-)Nummer: 7
DOI: 10.1039/D2QI00053A
Kurzbeschreibung (Abstract):

Sol-gel chemistry, while being extremely established, is to this day not fully understood, and much of the underlying chemistry and mechanisms are yet to be unraveled. Here, we elaborate on the sol-gel chemistry of Cr2GaC, the first layered ternary carbide belonging to the MAX phase family to ever be synthesized using this wet chemical approach. Leveraging a variety of both in- and ex situ characterization techniques, including X-ray and neutron powder diffraction, X-ray absorption fine structure analyses, total scattering analyses, and differential scanning calorimetry coupled with mass spectrometry, in-depth analyses of the local structures and reaction pathways are elucidated. While the metals first form tetrahedrally and octahedrally coordinated oxidic structures, that subsequently grow and crystallize into oxides, the carbon source citric acid sits on a separate reaction pathway, that does not merge with the metals until the very end. In fact, after decomposing it remains nanostructured and disordered graphite until the temperature allows for the reduction of the metal oxides into the layered carbide. Based on this, we hypothesize that the method is mostly applicable to systems where the needed metals are reducible by graphite around the formation temperature of the target phase.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Theorie magnetischer Materialien
07 Fachbereich Chemie
07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie
Hinterlegungsdatum: 05 Okt 2022 06:40
Letzte Änderung: 06 Okt 2022 07:40
PPN: 499902270
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