Novel scalable mesoporous silica-assisted synthesis of high-quality ε-Fe2O3 nanoparticles revealing extraordinarily high coercivity

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73633625" target="_blank" >RIV/61989592:15310/25:73633625 - isvavai.cz</a>
Alternative codes found
RIV/61989592:15640/25:73633625
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S246851942500299X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S246851942500299X</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.mtchem.2025.102809" target="_blank" >10.1016/j.mtchem.2025.102809</a>

Result language
angličtina
Original language name
Novel scalable mesoporous silica-assisted synthesis of high-quality ε-Fe2O3 nanoparticles revealing extraordinarily high coercivity
Original language description
A new, scalable synthesis of epsilon-Fe2O3, an intermediate polymorph of iron oxide exhibiting a giant coercive field (HC) was proposed. This study focuses on the preparation of epsilon-Fe2O3 through the co-precipitation of magnetite nanoparticles, their simultaneous coating with mesoporous silica, and air-annealing at sintering temperatures ranging from 1050 to 1125 degrees C. Structural and magnetic measurements were conducted to identify the optimal conditions for critical parameters of the synthesis, including silica content, annealing temperature and time. These conditions resulted in the production of nearly single-phase epsilon-Fe2O3 (over 95 %) with an exceptionally large coercivity of 22 kOe without any additional metal doping. This achievement is attributed to the mesoporous silica coating, which altered the parameters of the heat-induced phase transformation pathway when compared with the silica-coated precursor. The mesoporous silica coating resulted in improving the epsilon-Fe2O3 stability during thermal treatment while the silica coating of magnetite particles achieved only 75 % purity at the same conditions.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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