Published in
American Chemical Society, Chemistry of Materials, 25(16), p. 5542-5548, 2004
DOI: 10.1021/cm048628m
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Optimized Synthesis of the Elusive ε-Fe2O3Phase via Sol−Gel Chemistry
,
Daniel Nižňanský,
Anna Roig,
Cecilia Savii,
Lluís Casas ,
Elies Molins ,
Karel Zaveta,
Corina Enache,
Jordi Sort ,
Sophie de Brion,
Gerard Chouteau,
Josep Nogués
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- Must not violate ACS ethical Guidelines
- Must obtain written permission from Editor
- Must not violate ACS ethical Guidelines
Abstract
is an element of-Fe2O3 nanoparticles embedded in a SiO2 matrix have been synthesized by sol-gel chemistry and high temperature heat treatments. Virtually pure is an element of-Fe2O3 (in excess of 93%) is obtained, although a two-phase mixture, is an element of-Fe2O3 + alpha-Fe2O3, is observed for Fe2O3/SiO2 ratios greater than 37 wt %. The is an element of-Fe2O3 nanoparticles are stable up to similar to1600 K. Optimized is an element of-Fe2O3 nanoparticles are ferrimagnetic, with a Curie temperature T-c approximate to 510 K, and remarkably high values of room-temperature coercivity, H-c = 20 kOe.