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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/61989592:15640/25:73633625

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Today Chemistry

ISSN

2468-5194

e-ISSN

—

Svazek periodika

47

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

nestránkováno

Kód UT WoS článku

001518695500001

EID výsledku v databázi Scopus

2-s2.0-105008451614