Surface-induced reversal of a phase transformation for the synthesis of ε-Fe2O3 nanoparticles with high coercivity
| Autor: | Laurence Motte, Tanja Barudzija, Irena Milosevic, Darko Makovec, Darko Hanzel, Marin Tadic, Slavko Kralj |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Nanostructure
Materials science Polymers and Plastics Oxide Maghemite Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Transformation chemistry.chemical_compound Phase (matter) Magnetic properties Metals and Alloys Coercivity Hematite 021001 nanoscience & nanotechnology Surface energy 0104 chemical sciences Electronic Optical and Magnetic Materials Chemical engineering chemistry visual_art Ceramics and Composites engineering visual_art.visual_art_medium 0210 nano-technology Transmission electron microscopy |
| Zdroj: | Acta Materialia |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2020.01.058 |
| Popis: | A metastable ε-polymorph of iron(III) oxide (ε-Fe2O3) is a very attractive material from the technological, engineering, and scientific points of view. In comparison with other iron oxides, it is characterized by unusual magnetic properties and a giant coercivity of ~20 kOe, which is the largest value among metal oxides. The routine method of ε-Fe2O3 formation is based on the thermal annealing of maghemite (γ-Fe2O3) nanoparticles confined in a silica matrix where the ε-Fe2O3 appears as an intermediate phase between the maghemite and an α-polymorph (α-Fe2O3) hematite (γ→ε→α pathway). In this study, it is demonstrated that the ε→α transformation can be reversed when hematite nanoparticles with an anisotropic hollow morphology are annealed above 600 °C. The observed reversal of the phase stability is explained in terms of an increased nanoparticle surface area and surface energy related to the hollow structure. This study demonstrates the applicability of surface-induced phase transformation to stabilize and control ε-Fe2O3 nanostructures with anisotropic shape and high coercivity ~1600 kA/m that is one of the key properties of functional magnetic materials for information processing and storage. The understanding of ε-Fe2O3 formation mechanism can provide a new viewpoint and guidance for designing metastable polymorphs and applicative properties. © 2020 Acta Materialia Inc. |
| Databáze: | OpenAIRE |
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