Magnetic properties of mechanochemically synthesized γ-Fe 2O3 nanoparticles

Takuya Tsuzuki; Franziska Schäffel; Michihito Muroi; Paul G. McCormick

doi:10.1016/j.jallcom.2011.02.073

Magnetic properties of mechanochemically synthesized γ-Fe ₂O₃ nanoparticles

Takuya Tsuzuki^*, Franziska Schäffel, Michihito Muroi, Paul G. McCormick

^*Corresponding author for this work

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

27 Citations (Scopus)

Abstract

The synthesis of mono-dispersed γ-Fe₂O₃ nanoparticles by mechanochemical processing was demonstrated for the first time, via the solid-state exchange reaction Fe₂(SO₄) ₃ + 3Na₂CO₃ → Fe₂(CO ₃)₃ + 3Na₂SO₄ → Fe ₂O₃ + 3Na₂SO₄ + 3CO₂(g) and subsequent heat treatment at 673 K. The nanoparticles had a volume-weighted mean diameter of 6 nm and a narrow size distribution with the standard deviation of 3 nm. The particles showed a superparamagnetic nature with the superparamagnetic blocking temperature of 56.6 K. The anisotropy constant was 6.0 × 10⁶ erg/cm³, two orders of magnitude larger than the magnetocrystalline anisotropy constant of bulk γ-Fe ₂O₃. The detailed analysis of the magnetic properties indicated that the γ-Fe₂O₃ nanoparticles had a core-shell structure, consisting of a ferrimagnetic core of ∼4 nm in diameter having a collinear spin configuration and a magnetically disordered shell of ∼1.2 nm in thickness.

Original language	English
Pages (from-to)	5420-5425
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	509
Issue number	17
DOIs	https://doi.org/10.1016/j.jallcom.2011.02.073
Publication status	Published - 28 Apr 2011
Externally published	Yes

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10.1016/j.jallcom.2011.02.073

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@article{9c5b3409aae34a9a82a42282a0ed8501,

title = "Magnetic properties of mechanochemically synthesized γ-Fe 2O3 nanoparticles",

abstract = "The synthesis of mono-dispersed γ-Fe2O3 nanoparticles by mechanochemical processing was demonstrated for the first time, via the solid-state exchange reaction Fe2(SO4) 3 + 3Na2CO3 → Fe2(CO 3)3 + 3Na2SO4 → Fe 2O3 + 3Na2SO4 + 3CO2(g) and subsequent heat treatment at 673 K. The nanoparticles had a volume-weighted mean diameter of 6 nm and a narrow size distribution with the standard deviation of 3 nm. The particles showed a superparamagnetic nature with the superparamagnetic blocking temperature of 56.6 K. The anisotropy constant was 6.0 × 106 erg/cm3, two orders of magnitude larger than the magnetocrystalline anisotropy constant of bulk γ-Fe 2O3. The detailed analysis of the magnetic properties indicated that the γ-Fe2O3 nanoparticles had a core-shell structure, consisting of a ferrimagnetic core of ∼4 nm in diameter having a collinear spin configuration and a magnetically disordered shell of ∼1.2 nm in thickness.",

keywords = "Magnetic property, Mechanochemical processing, Nanostructured materials, Oxide materials",

author = "Takuya Tsuzuki and Franziska Sch{\"a}ffel and Michihito Muroi and McCormick, \{Paul G.\}",

year = "2011",

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day = "28",

doi = "10.1016/j.jallcom.2011.02.073",

language = "English",

volume = "509",

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journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - Magnetic properties of mechanochemically synthesized γ-Fe 2O3 nanoparticles

AU - Tsuzuki, Takuya

AU - Schäffel, Franziska

AU - Muroi, Michihito

AU - McCormick, Paul G.

PY - 2011/4/28

Y1 - 2011/4/28

N2 - The synthesis of mono-dispersed γ-Fe2O3 nanoparticles by mechanochemical processing was demonstrated for the first time, via the solid-state exchange reaction Fe2(SO4) 3 + 3Na2CO3 → Fe2(CO 3)3 + 3Na2SO4 → Fe 2O3 + 3Na2SO4 + 3CO2(g) and subsequent heat treatment at 673 K. The nanoparticles had a volume-weighted mean diameter of 6 nm and a narrow size distribution with the standard deviation of 3 nm. The particles showed a superparamagnetic nature with the superparamagnetic blocking temperature of 56.6 K. The anisotropy constant was 6.0 × 106 erg/cm3, two orders of magnitude larger than the magnetocrystalline anisotropy constant of bulk γ-Fe 2O3. The detailed analysis of the magnetic properties indicated that the γ-Fe2O3 nanoparticles had a core-shell structure, consisting of a ferrimagnetic core of ∼4 nm in diameter having a collinear spin configuration and a magnetically disordered shell of ∼1.2 nm in thickness.

AB - The synthesis of mono-dispersed γ-Fe2O3 nanoparticles by mechanochemical processing was demonstrated for the first time, via the solid-state exchange reaction Fe2(SO4) 3 + 3Na2CO3 → Fe2(CO 3)3 + 3Na2SO4 → Fe 2O3 + 3Na2SO4 + 3CO2(g) and subsequent heat treatment at 673 K. The nanoparticles had a volume-weighted mean diameter of 6 nm and a narrow size distribution with the standard deviation of 3 nm. The particles showed a superparamagnetic nature with the superparamagnetic blocking temperature of 56.6 K. The anisotropy constant was 6.0 × 106 erg/cm3, two orders of magnitude larger than the magnetocrystalline anisotropy constant of bulk γ-Fe 2O3. The detailed analysis of the magnetic properties indicated that the γ-Fe2O3 nanoparticles had a core-shell structure, consisting of a ferrimagnetic core of ∼4 nm in diameter having a collinear spin configuration and a magnetically disordered shell of ∼1.2 nm in thickness.

KW - Magnetic property

KW - Mechanochemical processing

KW - Nanostructured materials

KW - Oxide materials

UR - https://www.scopus.com/pages/publications/79953173199

U2 - 10.1016/j.jallcom.2011.02.073

DO - 10.1016/j.jallcom.2011.02.073

M3 - Article

SN - 0925-8388

VL - 509

SP - 5420

EP - 5425

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 17

ER -

Magnetic properties of mechanochemically synthesized γ-Fe ₂O₃ nanoparticles

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