Forced hydrolysis of FeCl3 solutions in the presence of Cr3+ ions and hexamethylenetetramine

Robić, Marko; Ristić, Mira; Krehula, Stjepko; Kuzmann, Ernő; Homonnay, Zoltán; Musić, Svetozar (2022) Forced hydrolysis of FeCl3 solutions in the presence of Cr3+ ions and hexamethylenetetramine. Journal of Materials Research, 38 (4). pp. 1048-1060. ISSN 0884-2914

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Abstract

The phase analysis and nanostructural properties of the precipitates formed by forced hydrolysis of FeCl3 solutions at 160 °C in the presence of Cr3+ ions and hexamethylenetetramine (HMTA) were investigated. The phase analyses of the precipitates showed the presence of ferrihydrite (amorphous-like), α-FeOOH, β-FeOOH, and α-Fe2O3. The exact phase composition was strongly dependent on the starting chemical composition in the solution and the precipitation time. Ferrihydrite, α-FeOOH, and β-FeOOH were the precursors of α-Fe2O3 as the end-product. Upon 2 h of autoclaving at 160 °C, the precipitates consisted of nanoparticles ~ 35 to ~ 50 nm in size, whereas after 24 h their size increased to ~ 100 nm. New shapes of these nanoparticles were found. In these precipitation systems crystalline chromium (hydrous)oxide phase was not detected. However, the formation of solid solutions between Cr3+ ions and iron oxides could not be excluded taking into account Energy-dispersive X-ray spectroscopy (EDS) measurements.

Item Type:	Article
Additional Information:	This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://doi.org/10.1557/s43578-022-00756-2
Uncontrolled Keywords:	Cr; Fe; Kinetics; Morphology; Mössbauer effect; Oxide
Subjects:	NATURAL SCIENCES > Chemistry > Inorganic Chemistry
Divisions:	Division of Materials Chemistry
Projects:	Project title Project leader Project code Project type Nastajanje i svojstva 1D α-Fe2O3 nanostruktura dopiranih odabranim metalnim ionima Mira Ristić; Stjepko Krehula IP-2016-06-8254 HrZZ-istraživački projekti
Depositing User:	Marko Robić
Date Deposited:	16 Dec 2025 14:29
URI:	http://fulir.irb.hr/id/eprint/10485
DOI:	10.1557/s43578-022-00756-2

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