Optimized synthesis of the elusive ∈-Fe<inf>2</inf>O<inf>3</inf> phase via sol-gel chemistry

Mihaela Popovici; Martí Gich; Daniel Nižňanský; Anna Roig; Cecilia Savii; Lluís Casas; Elies Molins; Karel Zaveta; Corina Enache; Jordi Sort; Sophie De Brion; Gerard Chouteau; Josep Nogués

doi:https://doi.org/10.1021/cm048628m

Optimized synthesis of the elusive ∈-Fe<inf>2</inf>O<inf>3</inf> phase via sol-gel chemistry

Mihaela Popovici, Martí Gich, 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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Abstract

∈-Fe2O3 nanoparticles embedded in a SiO 2 matrix have been synthesized by sol-gel chemistry and high temperature heat treatments. Virtually pure ∈-Fe2O3 (in excess of 93%) is obtained, although a two-phase mixture, ∈-Fe 2O3 + α-Fe2O3, is observed for Fe2O3/SiO2 ratios greater than 37 wt %. The ∈-Fe2O3 nanoparticles are stable up to ∼1600 K. Optimized ∈-Fe2O3 nanoparticles are ferrimagnetic, with a Curie temperature TC ≈ 510 K, and remarkably high values of room-temperature coercivity, HC = 20 kOe.

Original language	English
Pages (from-to)	5542-5548
Journal	Chemistry of Materials
Volume	16
DOIs	https://doi.org/10.1021/cm048628m
Publication status	Published - 14 Dec 2004

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title = "Optimized synthesis of the elusive ∈-Fe2O3 phase via sol-gel chemistry",

abstract = "∈-Fe2O3 nanoparticles embedded in a SiO 2 matrix have been synthesized by sol-gel chemistry and high temperature heat treatments. Virtually pure ∈-Fe2O3 (in excess of 93%) is obtained, although a two-phase mixture, ∈-Fe 2O3 + α-Fe2O3, is observed for Fe2O3/SiO2 ratios greater than 37 wt %. The ∈-Fe2O3 nanoparticles are stable up to ∼1600 K. Optimized ∈-Fe2O3 nanoparticles are ferrimagnetic, with a Curie temperature TC ≈ 510 K, and remarkably high values of room-temperature coercivity, HC = 20 kOe.",

author = "Mihaela Popovici and Mart{\'i} Gich and Daniel Ni{\v z}{\v n}ansk{\'y} and Anna Roig and Cecilia Savii and Llu{\'i}s Casas and Elies Molins and Karel Zaveta and Corina Enache and Jordi Sort and {De Brion}, Sophie and Gerard Chouteau and Josep Nogu{\'e}s",

year = "2004",

month = dec,

day = "14",

doi = "https://doi.org/10.1021/cm048628m",

language = "English",

volume = "16",

pages = "5542--5548",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Optimized synthesis of the elusive ∈-Fe2O3 phase via sol-gel chemistry

AU - Popovici, Mihaela

AU - Gich, Martí

AU - Nižňanský, Daniel

AU - Roig, Anna

AU - Savii, Cecilia

AU - Casas, Lluís

AU - Molins, Elies

AU - Zaveta, Karel

AU - Enache, Corina

AU - Sort, Jordi

AU - De Brion, Sophie

AU - Chouteau, Gerard

AU - Nogués, Josep

PY - 2004/12/14

Y1 - 2004/12/14

N2 - ∈-Fe2O3 nanoparticles embedded in a SiO 2 matrix have been synthesized by sol-gel chemistry and high temperature heat treatments. Virtually pure ∈-Fe2O3 (in excess of 93%) is obtained, although a two-phase mixture, ∈-Fe 2O3 + α-Fe2O3, is observed for Fe2O3/SiO2 ratios greater than 37 wt %. The ∈-Fe2O3 nanoparticles are stable up to ∼1600 K. Optimized ∈-Fe2O3 nanoparticles are ferrimagnetic, with a Curie temperature TC ≈ 510 K, and remarkably high values of room-temperature coercivity, HC = 20 kOe.

AB - ∈-Fe2O3 nanoparticles embedded in a SiO 2 matrix have been synthesized by sol-gel chemistry and high temperature heat treatments. Virtually pure ∈-Fe2O3 (in excess of 93%) is obtained, although a two-phase mixture, ∈-Fe 2O3 + α-Fe2O3, is observed for Fe2O3/SiO2 ratios greater than 37 wt %. The ∈-Fe2O3 nanoparticles are stable up to ∼1600 K. Optimized ∈-Fe2O3 nanoparticles are ferrimagnetic, with a Curie temperature TC ≈ 510 K, and remarkably high values of room-temperature coercivity, HC = 20 kOe.

U2 - https://doi.org/10.1021/cm048628m

DO - https://doi.org/10.1021/cm048628m

M3 - Article

SN - 0897-4756

VL - 16

SP - 5542

EP - 5548

JO - Chemistry of Materials

JF - Chemistry of Materials

ER -

Optimized synthesis of the elusive ∈-Fe<inf>2</inf>O<inf>3</inf> phase via sol-gel chemistry

Abstract

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