Universität zu Köln

Nahrstedt, Vanessa, Stadler, Daniel ORCID: 0000-0003-3233-9167, Fischer, Thomas, Duchon, Tomas, Mueller, David N., Schneider, Claus M. ORCID: 0000-0002-3920-6255 and Mathur, Sanjay (2021). Molecular Level Synthesis of InFeO3 and InFeO3/Fe2O3 Nanocomposites. Inorg. Chem., 60 (6). S. 3719 - 3729. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-510X

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Abstract

New heterometallic In-Fe alkoxides [InFe-((OBu)-Bu-t)(4)(PyTFP)(2)] (1), [InFe2(O(neo)Pen)(9)(Py)] (2), and [InFe3(O(neo)Pen)(12)] (3) were synthesized and structurally characterized. The arrangement of metal centers in mixed-metal framework was governed by the In:Fe ratio and the coordination preferences of Fe(III) and In(III) centers to be in tetrahedral and octahedral environments, respectively. 3 displayed a star-shaped socalled Mitsubishi motif with the central In atom coordinated with three tetrahedral {Fe(O(neo)Pen)(4)}(-) anionic units. The deterministic structural influence of the larger In atom was evident in 1 and 2 which displayed the coordination of neutral coligands to achieve the desired coordination number. Thermal decomposition studies of compounds 1-3 under inert conditions with subsequent powder diffraction studies revealed the formation of Fe2O3 and In2O3 in the case of 3 and 2, whereas 1 intriguingly produced elemental In and Fe. In contrary, the thermal decomposition of 1-3 under ambient conditions produced a ternary oxide, InFeO3, with additional Fe2O3 present as a secondary phase in a different stoichiometric ratio predetermined through the In:Fe ratio in 2 and 3. The intimate mixing of different phases in InFeO3/Fe2O3 nanocomposites was confirmed by transmission electron microscopy of solid residues obtained after the decomposition of 1 and 2. The pure InFeO3 particles demonstrated ferromagnetic anomalies around 170 K as determined by temperature-dependent field-cooled and zero-field-cooled magnetization experiments. A first-order magnetic transition with an increase in the ZFC measurements was explained by temperature-induced reduction of the Fe-Fe distance and the corresponding increase in superexchange.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Nahrstedt, Vanessa UNSPECIFIED UNSPECIFIED UNSPECIFIED Stadler, Daniel UNSPECIFIED orcid.org/0000-0003-3233-9167 UNSPECIFIED Fischer, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Duchon, Tomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, David N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, Claus M. UNSPECIFIED orcid.org/0000-0002-3920-6255 UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-577327
DOI:	10.1021/acs.inorgchem.0c03425
Journal or Publication Title:	Inorg. Chem.
Volume:	60
Number:	6
Page Range:	S. 3719 - 3729
Date:	2021
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-510X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Chemistry, Inorganic & Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57732