Resolving a structural issue in cerium-nickel-based oxide: a single compound or a two-phase system?

Autor:	Kojčinović J; Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000 Osijek, Croatia. igor.djerdj@kemija.unios.hr., Tatar D; Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000 Osijek, Croatia. igor.djerdj@kemija.unios.hr., Šarić S; Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000 Osijek, Croatia. igor.djerdj@kemija.unios.hr., Bartus Pravda C; Department of Applied and Environmental Chemistry, University of Szeged, 6720 Szeged, Hungary., Mavrič A; University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia., Arčon I; University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia.; Institute Jožef Stefan, Jamova 39, 1000 Ljubljana, Slovenia., Jagličić Z; Institute of Mathematics, Physics, and Mechanics, University of Ljubljana, Jamova 2, 1000 Ljubljana, Slovenia.; Faculty of Civil & Geodetic Engineering, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia., Mellin M; Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt, Otto-Berndt-Strasse 3, 64287 Darmstadt, Germany., Einert M; Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt, Otto-Berndt-Strasse 3, 64287 Darmstadt, Germany., Altomare A; Institute of Crystallography, CNR, via Amendola 122/o, Bari 70126, Italy., Caliandro R; Institute of Crystallography, CNR, via Amendola 122/o, Bari 70126, Italy., Kukovecz Á; Department of Applied and Environmental Chemistry, University of Szeged, 6720 Szeged, Hungary., Hofmann JP; Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt, Otto-Berndt-Strasse 3, 64287 Darmstadt, Germany., Djerdj I; Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000 Osijek, Croatia. igor.djerdj@kemija.unios.hr.
Jazyk:	angličtina
Zdroj:	Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2024 Jan 30; Vol. 53 (5), pp. 2082-2097. Date of Electronic Publication: 2024 Jan 30.
DOI:	10.1039/d3dt03280a
Abstrakt:	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.
Databáze:	MEDLINE
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