Investigation of the precursors of γ-Fe2O3 in Fe2O3/SiO2 nanocomposites obtained through sol-gel

C. Cannas; G. Concas; A. Falqui; A. Musinu; G. Spano; G. Piccaluga

doi:10.1016/S0022-3093(01)00504-X

Investigation of the precursors of γ-Fe₂O₃ in Fe₂O₃/SiO₂ nanocomposites obtained through sol-gel

C. Cannas, G. Concas, A. Falqui, A. Musinu^*, G. Spano, G. Piccaluga

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

The structure and the magnetic properties of a series of Fe₂O₃-SiO₂ nanocomposites (16.9 and 28.5 wt% of Fe₂O₃/(Fe₂O₃ + SiO₂)), prepared by a sol-gel method and submitted to thermal treatments in a temperature range 300-700°C, were investigated through X-ray diffraction (XRD), transmission electron microscopy (TEM), Mössbauer spectroscopy and magnetometry. Poorly crystallized particles, belonging to the 2-line ferrihydrite phase, were found in all the samples and recognized as precursors of the γ-Fe₂O₃ that form in Fe₂O₃-SiO₂ nanocomposites at T > 700°C. The result was achieved through a detailed comparison of structural and magnetic properties of nanocomposites with a bulk iron (III) oxide hydrated reference sample.

Original language	English (US)
Pages (from-to)	64-73
Number of pages	10
Journal	Journal of Non-Crystalline Solids
Volume	286
Issue number	1-2
DOIs	https://doi.org/10.1016/S0022-3093(01)00504-X
State	Published - Jun 2001
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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10.1016/S0022-3093(01)00504-X

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title = "Investigation of the precursors of γ-Fe2O3 in Fe2O3/SiO2 nanocomposites obtained through sol-gel",

abstract = "The structure and the magnetic properties of a series of Fe2O3-SiO2 nanocomposites (16.9 and 28.5 wt% of Fe2O3/(Fe2O3 + SiO2)), prepared by a sol-gel method and submitted to thermal treatments in a temperature range 300-700°C, were investigated through X-ray diffraction (XRD), transmission electron microscopy (TEM), M{\"o}ssbauer spectroscopy and magnetometry. Poorly crystallized particles, belonging to the 2-line ferrihydrite phase, were found in all the samples and recognized as precursors of the γ-Fe2O3 that form in Fe2O3-SiO2 nanocomposites at T > 700°C. The result was achieved through a detailed comparison of structural and magnetic properties of nanocomposites with a bulk iron (III) oxide hydrated reference sample.",

author = "C. Cannas and G. Concas and A. Falqui and A. Musinu and G. Spano and G. Piccaluga",

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doi = "10.1016/S0022-3093(01)00504-X",

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T1 - Investigation of the precursors of γ-Fe2O3 in Fe2O3/SiO2 nanocomposites obtained through sol-gel

AU - Cannas, C.

AU - Concas, G.

AU - Falqui, A.

AU - Musinu, A.

AU - Spano, G.

AU - Piccaluga, G.

PY - 2001/6

Y1 - 2001/6

N2 - The structure and the magnetic properties of a series of Fe2O3-SiO2 nanocomposites (16.9 and 28.5 wt% of Fe2O3/(Fe2O3 + SiO2)), prepared by a sol-gel method and submitted to thermal treatments in a temperature range 300-700°C, were investigated through X-ray diffraction (XRD), transmission electron microscopy (TEM), Mössbauer spectroscopy and magnetometry. Poorly crystallized particles, belonging to the 2-line ferrihydrite phase, were found in all the samples and recognized as precursors of the γ-Fe2O3 that form in Fe2O3-SiO2 nanocomposites at T > 700°C. The result was achieved through a detailed comparison of structural and magnetic properties of nanocomposites with a bulk iron (III) oxide hydrated reference sample.

AB - The structure and the magnetic properties of a series of Fe2O3-SiO2 nanocomposites (16.9 and 28.5 wt% of Fe2O3/(Fe2O3 + SiO2)), prepared by a sol-gel method and submitted to thermal treatments in a temperature range 300-700°C, were investigated through X-ray diffraction (XRD), transmission electron microscopy (TEM), Mössbauer spectroscopy and magnetometry. Poorly crystallized particles, belonging to the 2-line ferrihydrite phase, were found in all the samples and recognized as precursors of the γ-Fe2O3 that form in Fe2O3-SiO2 nanocomposites at T > 700°C. The result was achieved through a detailed comparison of structural and magnetic properties of nanocomposites with a bulk iron (III) oxide hydrated reference sample.

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U2 - 10.1016/S0022-3093(01)00504-X

DO - 10.1016/S0022-3093(01)00504-X

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VL - 286

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EP - 73

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 1-2

ER -

Investigation of the precursors of γ-Fe₂O₃ in Fe₂O₃/SiO₂ nanocomposites obtained through sol-gel

Abstract

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