Enhanced coercivity in co-rich near-stoichiometric Co<inf>x</inf>Fe <inf>3-x</inf>O<inf>4+δ</inf> nanoparticles prepared in large batches

German Salazar-Alvarez; Richard T. Olsson; Jordi Sort; Waldemar A.A. Macedo; José D. Ardisson; Maria Dolors Baró; Ulf W. Gedde; Josep Nogués

doi:https://doi.org/10.1021/cm070827t

Enhanced coercivity in co-rich near-stoichiometric Co<inf>x</inf>Fe <inf>3-x</inf>O<inf>4+δ</inf> nanoparticles prepared in large batches

German Salazar-Alvarez, Richard T. Olsson, Jordi Sort, Waldemar A.A. Macedo, José D. Ardisson, Maria Dolors Baró, Ulf W. Gedde, Josep Nogués

Department of Physics

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

40 Citations (Scopus)

Abstract

The relationship between the structure and composition with the magnetic properties of near stoichiometric cobalt ferrite nanoparticles Co xFe3-xO4+δ (0.85 < x < 1.1) prepared in large batches with average sizes in the range 60-210 nm has been investigated. Chemical analysis and Rietveld refinement of the X-ray diffraction data in conjunction with Mössbauer spectroscopy allowed us to identify an interplay between particle size, microstructure (concentration of interstitial ions, microstrain, cation arrangement in octahedral and tetrahedral sites), and composition, which sensitively controls the magnetic properties such as coercivity and saturation magnetization. In all cases, cobalt-rich compositions resulted in a higher coercivity, whereas lower degrees of inversion and higher iron contents led to slightly higher saturation magnetization values. © 2007 American Chemical Society.

Original language	English
Pages (from-to)	4957-4963
Journal	Chemistry of Materials
Volume	19
DOIs	https://doi.org/10.1021/cm070827t
Publication status	Published - 2 Oct 2007

Access to Document

https://doi.org/10.1021/cm070827t

Cite this

@article{6b8184e8fe8d41b4be71f6092b062d38,

title = "Enhanced coercivity in co-rich near-stoichiometric CoxFe 3-xO4+δ nanoparticles prepared in large batches",

abstract = "The relationship between the structure and composition with the magnetic properties of near stoichiometric cobalt ferrite nanoparticles Co xFe3-xO4+δ (0.85 < x < 1.1) prepared in large batches with average sizes in the range 60-210 nm has been investigated. Chemical analysis and Rietveld refinement of the X-ray diffraction data in conjunction with M{\"o}ssbauer spectroscopy allowed us to identify an interplay between particle size, microstructure (concentration of interstitial ions, microstrain, cation arrangement in octahedral and tetrahedral sites), and composition, which sensitively controls the magnetic properties such as coercivity and saturation magnetization. In all cases, cobalt-rich compositions resulted in a higher coercivity, whereas lower degrees of inversion and higher iron contents led to slightly higher saturation magnetization values. {\textcopyright} 2007 American Chemical Society.",

author = "German Salazar-Alvarez and Olsson, {Richard T.} and Jordi Sort and Macedo, {Waldemar A.A.} and Ardisson, {Jos{\'e} D.} and Bar{\'o}, {Maria Dolors} and Gedde, {Ulf W.} and Josep Nogu{\'e}s",

year = "2007",

month = oct,

day = "2",

doi = "https://doi.org/10.1021/cm070827t",

language = "English",

volume = "19",

pages = "4957--4963",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

}

TY - JOUR

T1 - Enhanced coercivity in co-rich near-stoichiometric CoxFe 3-xO4+δ nanoparticles prepared in large batches

AU - Salazar-Alvarez, German

AU - Olsson, Richard T.

AU - Sort, Jordi

AU - Macedo, Waldemar A.A.

AU - Ardisson, José D.

AU - Baró, Maria Dolors

AU - Gedde, Ulf W.

AU - Nogués, Josep

PY - 2007/10/2

Y1 - 2007/10/2

N2 - The relationship between the structure and composition with the magnetic properties of near stoichiometric cobalt ferrite nanoparticles Co xFe3-xO4+δ (0.85 < x < 1.1) prepared in large batches with average sizes in the range 60-210 nm has been investigated. Chemical analysis and Rietveld refinement of the X-ray diffraction data in conjunction with Mössbauer spectroscopy allowed us to identify an interplay between particle size, microstructure (concentration of interstitial ions, microstrain, cation arrangement in octahedral and tetrahedral sites), and composition, which sensitively controls the magnetic properties such as coercivity and saturation magnetization. In all cases, cobalt-rich compositions resulted in a higher coercivity, whereas lower degrees of inversion and higher iron contents led to slightly higher saturation magnetization values. © 2007 American Chemical Society.

AB - The relationship between the structure and composition with the magnetic properties of near stoichiometric cobalt ferrite nanoparticles Co xFe3-xO4+δ (0.85 < x < 1.1) prepared in large batches with average sizes in the range 60-210 nm has been investigated. Chemical analysis and Rietveld refinement of the X-ray diffraction data in conjunction with Mössbauer spectroscopy allowed us to identify an interplay between particle size, microstructure (concentration of interstitial ions, microstrain, cation arrangement in octahedral and tetrahedral sites), and composition, which sensitively controls the magnetic properties such as coercivity and saturation magnetization. In all cases, cobalt-rich compositions resulted in a higher coercivity, whereas lower degrees of inversion and higher iron contents led to slightly higher saturation magnetization values. © 2007 American Chemical Society.

U2 - https://doi.org/10.1021/cm070827t

DO - https://doi.org/10.1021/cm070827t

M3 - Article

SN - 0897-4756

VL - 19

SP - 4957

EP - 4963

JO - Chemistry of Materials

JF - Chemistry of Materials

ER -

Enhanced coercivity in co-rich near-stoichiometric Co<inf>x</inf>Fe <inf>3-x</inf>O<inf>4+δ</inf> nanoparticles prepared in large batches

Abstract

Access to Document

Fingerprint

Cite this