Kojčinović, Jelena ; Tatar, Dalibor ; Šarić, Stjepan ; Bartus Pravda, Cora ; Mavrič, Andraž ; Arčon, Iztok ; Jagličić, Zvonko ; Mellin, Maximilian ; Einert, Marcus ; Altomare, Angela ; Caliandro, Rocco ; Kukovecz, Ákos ; Hofmann, Jan P. ; Djerdj, Igor (2024)
Resolving a structural issue in cerium-nickel-based oxide: a single compound or a two-phase system?
In: Dalton Transactions, 53 (5)
doi: 10.1039/D3DT03280A
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
CeNiO 3 has been reported in the literature in the last few years as a novel LnNiO 3 compound with promising applications in different catalytic fields, but its structure has not been correctly reported so far. In this research, CeNiO 3 (RB1), CeO 2 and NiO have been synthesized in a nanocrystalline form using a modified citrate aqueous sol–gel route. A direct comparison between the equimolar physical mixture ( n (CeO 2 ) : n (NiO) = 1 : 1) and compound RB1 was made. Their structural differences were investigated by laboratory powder X-ray diffraction (PXRD), selected area electron diffraction (SAED), transmission electron microscopy (TEM) with an energy-dispersive X-ray spectroscopy (EDS) detector, and Raman spectroscopy. The surface of the compounds was analyzed by X-ray photoelectron spectroscopy (XPS), while the thermal behaviour was explored by thermogravimetric analysis (TGA). Their magnetic properties were also investigated with the aim of exploring the differences between these two compounds. There were clear differences between the physical mixture of CeO 2 + NiO and RB1 presented by all of these employed methods. Synchrotron methods, such as atomic pair distribution function analysis (PDF), X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), were used to explore the structure of RB1 in more detail. Three different models for the structural solution of RB1 were proposed. One structural solution proposes that RB1 is a single-phase pyrochlore compound (Ce 2 Ni 2 O 7 ) while the other two solutions suggest that RB1 is a two-phase system of either CeO 2 + NiO or Ce 1− x Ni x O 2 and NiO.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Kojčinović, Jelena ; Tatar, Dalibor ; Šarić, Stjepan ; Bartus Pravda, Cora ; Mavrič, Andraž ; Arčon, Iztok ; Jagličić, Zvonko ; Mellin, Maximilian ; Einert, Marcus ; Altomare, Angela ; Caliandro, Rocco ; Kukovecz, Ákos ; Hofmann, Jan P. ; Djerdj, Igor |
| Art des Eintrags: | Bibliographie |
| Titel: | Resolving a structural issue in cerium-nickel-based oxide: a single compound or a two-phase system? |
| Sprache: | Englisch |
| Publikationsjahr: | 2024 |
| Verlag: | Royal Society of Chemistry |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Dalton Transactions |
| Jahrgang/Volume einer Zeitschrift: | 53 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.1039/D3DT03280A |
| Kurzbeschreibung (Abstract): | CeNiO 3 has been reported in the literature in the last few years as a novel LnNiO 3 compound with promising applications in different catalytic fields, but its structure has not been correctly reported so far. In this research, CeNiO 3 (RB1), CeO 2 and NiO have been synthesized in a nanocrystalline form using a modified citrate aqueous sol–gel route. A direct comparison between the equimolar physical mixture ( n (CeO 2 ) : n (NiO) = 1 : 1) and compound RB1 was made. Their structural differences were investigated by laboratory powder X-ray diffraction (PXRD), selected area electron diffraction (SAED), transmission electron microscopy (TEM) with an energy-dispersive X-ray spectroscopy (EDS) detector, and Raman spectroscopy. The surface of the compounds was analyzed by X-ray photoelectron spectroscopy (XPS), while the thermal behaviour was explored by thermogravimetric analysis (TGA). Their magnetic properties were also investigated with the aim of exploring the differences between these two compounds. There were clear differences between the physical mixture of CeO 2 + NiO and RB1 presented by all of these employed methods. Synchrotron methods, such as atomic pair distribution function analysis (PDF), X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), were used to explore the structure of RB1 in more detail. Three different models for the structural solution of RB1 were proposed. One structural solution proposes that RB1 is a single-phase pyrochlore compound (Ce 2 Ni 2 O 7 ) while the other two solutions suggest that RB1 is a two-phase system of either CeO 2 + NiO or Ce 1− x Ni x O 2 and NiO. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung |
| Hinterlegungsdatum: | 11 Dez 2024 06:11 |
| Letzte Änderung: | 11 Dez 2024 09:33 |
| PPN: | 524515336 |
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