A combined micro-Raman, X-ray absorption and magnetic study to follow the glycerol-assisted growth of epsilon-iron oxide sol-gel coatings

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López Sánchez, Jesús and Serrano, Aída and Campo, A. del and Muñoz Noval, Álvaro and Salas Colera, Eduardo and Cabero Piris, Mariona and Varela del Arco, María and Abuín, Manuel and Castro, German R. and Rubio Zuazo, Juan and Rodríguez de la Fuente, Óscar and Carmona Tejero, Noemí (2022) A combined micro-Raman, X-ray absorption and magnetic study to follow the glycerol-assisted growth of epsilon-iron oxide sol-gel coatings. Journal of alloys and compounds, 892 . ISSN 0925-8388

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Official URL: http://dx.doi.org/10.1016/j.jallcom.2021.162061




Abstract

Epsilon iron oxide (epsilon-Fe_2O_3) coatings on Si(100) substrates are obtained by an easy one-pot sol-gel recipe assisted by glycerol in an acid medium. Glycerol, given its small dimensions, enables the formation of epsilon-Fe_2O_3 nanoparticles with a size of a few nanometers and the highest purity is reached in coatings after a densification treatment at 960 degrees C. The structural and compositional evolution up to 1200 degrees C is studied by confocal Raman microscopy and X-ray absorption spectroscopy techniques, correlating the existing magnetic properties. We report a novel characterization method, which allows monitoring the evolution of the precursor micelles as well as the intermediate and final phases formed. Furthermore, the inherent industrial technology transfer of the sol-gel process is also demonstrated with the epsilon-Fe_2O_3 polymorph, impelling its application in the coatings form.


Item Type:Article
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CRUE-CSIC (Acuerdos Transformativos 2021)

©2021 The Author(s). Published by Elsevier
This work has been supported by the Ministerio de Ciencia e Innovación (MCINN, Spain) through the projects PIE: 2021-60-E-030, PIE: 2010-6-OE-013, PID2019-104717RB-I00 (2020–2022), MAT2017- 86540-C4-1-R, RTI2018-095856-B-C21 (2019–2021), RTI2018- 097895-B-C43 and RTI2018-095303-A-C52. The authors are grateful to The ESRF (France), MCINN and Consejo Superior de Investigations Científicas (CSIC, Spain) for the provision of synchrotron radiation facilities and to the BM25-SpLine Staff for their valuable help. A.S. and A.M.-N acknowledge financial support from Comunidad de Madrid (Spain) for an “Atracción de Talento Investigador” Contract 2017-t2/IND5395 and 2018-T1/IND-10360, respectively

Uncontrolled Keywords:High-temperature; Thin-films; Spectroscopy; Phase; Maghemite; Nanoparticles; FE_2O_3/SIO_2; Epsilon iron oxide; Sol-gel Method; Glycerol as a steric agent; X-ray absorption spectroscopy; Confocal Raman microscopy; Magnetism
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:68364
Deposited On:27 Oct 2021 18:19
Last Modified:09 May 2022 16:15

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