A Structural and magnetic investigation of the inversion degree in ferrite nanocrystals mfe2o4 (M = Mn, Co, Ni)

D. Carta; M. F. Casula; A. Falqui; Danilo Loche; G. Mountjoy; C. Sangregorio; A. Corrias

doi:10.1021/jp901077c

A Structural and magnetic investigation of the inversion degree in ferrite nanocrystals mfe₂o₄ (M = Mn, Co, Ni)

D. Carta, M. F. Casula, A. Falqui, Danilo Loche, G. Mountjoy, C. Sangregorio, A. Corrias^*

^*Corresponding author for this work

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

457 Scopus citations

Abstract

The structural and magnetic properties of nanocrystalline manganese, cobalt, and nickel spinel ferrites dispersed in a highly porous SiO₂ aerogel matrix were studied. X-ray diffraction and high-resolution transmission electron microscopy indicate that single crystalline ferrite nanoparticles are well dispersed in the amorphous matrix. The cation distribution between the octahedral and tetrahedral sites of the spinel structure was investigated by X-ray absorption spectroscopy. The analysis of both the X-ray absorption near edge structure and the extended X-ray absorption line structure indicates that the degree of inversion of the spinel structure increases in the series Mn, Co, and Ni spinel, in accordance with the values commonly found in the corresponding bulk spinels. In particular, fitting of the EXAFS data indicates that the degree of inversion in nanosized ferrites is 0.20 for MnFe₂O ₄, 0.68 for CoFe₂O₄, and 1.00 for NiFe ₂O₄. Magnetic characterization further supports these findings.

Original language	English (US)
Pages (from-to)	8606-8615
Number of pages	10
Journal	JOURNAL OF PHYSICAL CHEMISTRY C
Volume	113
Issue number	20
DOIs	https://doi.org/10.1021/jp901077c
State	Published - May 21 2009
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "A Structural and magnetic investigation of the inversion degree in ferrite nanocrystals mfe2o4 (M = Mn, Co, Ni)",

abstract = "The structural and magnetic properties of nanocrystalline manganese, cobalt, and nickel spinel ferrites dispersed in a highly porous SiO2 aerogel matrix were studied. X-ray diffraction and high-resolution transmission electron microscopy indicate that single crystalline ferrite nanoparticles are well dispersed in the amorphous matrix. The cation distribution between the octahedral and tetrahedral sites of the spinel structure was investigated by X-ray absorption spectroscopy. The analysis of both the X-ray absorption near edge structure and the extended X-ray absorption line structure indicates that the degree of inversion of the spinel structure increases in the series Mn, Co, and Ni spinel, in accordance with the values commonly found in the corresponding bulk spinels. In particular, fitting of the EXAFS data indicates that the degree of inversion in nanosized ferrites is 0.20 for MnFe2O 4, 0.68 for CoFe2O4, and 1.00 for NiFe 2O4. Magnetic characterization further supports these findings.",

author = "D. Carta and Casula, {M. F.} and A. Falqui and Danilo Loche and G. Mountjoy and C. Sangregorio and A. Corrias",

year = "2009",

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T1 - A Structural and magnetic investigation of the inversion degree in ferrite nanocrystals mfe2o4 (M = Mn, Co, Ni)

AU - Carta, D.

AU - Casula, M. F.

AU - Falqui, A.

AU - Loche, Danilo

AU - Mountjoy, G.

AU - Sangregorio, C.

AU - Corrias, A.

PY - 2009/5/21

Y1 - 2009/5/21

N2 - The structural and magnetic properties of nanocrystalline manganese, cobalt, and nickel spinel ferrites dispersed in a highly porous SiO2 aerogel matrix were studied. X-ray diffraction and high-resolution transmission electron microscopy indicate that single crystalline ferrite nanoparticles are well dispersed in the amorphous matrix. The cation distribution between the octahedral and tetrahedral sites of the spinel structure was investigated by X-ray absorption spectroscopy. The analysis of both the X-ray absorption near edge structure and the extended X-ray absorption line structure indicates that the degree of inversion of the spinel structure increases in the series Mn, Co, and Ni spinel, in accordance with the values commonly found in the corresponding bulk spinels. In particular, fitting of the EXAFS data indicates that the degree of inversion in nanosized ferrites is 0.20 for MnFe2O 4, 0.68 for CoFe2O4, and 1.00 for NiFe 2O4. Magnetic characterization further supports these findings.

AB - The structural and magnetic properties of nanocrystalline manganese, cobalt, and nickel spinel ferrites dispersed in a highly porous SiO2 aerogel matrix were studied. X-ray diffraction and high-resolution transmission electron microscopy indicate that single crystalline ferrite nanoparticles are well dispersed in the amorphous matrix. The cation distribution between the octahedral and tetrahedral sites of the spinel structure was investigated by X-ray absorption spectroscopy. The analysis of both the X-ray absorption near edge structure and the extended X-ray absorption line structure indicates that the degree of inversion of the spinel structure increases in the series Mn, Co, and Ni spinel, in accordance with the values commonly found in the corresponding bulk spinels. In particular, fitting of the EXAFS data indicates that the degree of inversion in nanosized ferrites is 0.20 for MnFe2O 4, 0.68 for CoFe2O4, and 1.00 for NiFe 2O4. Magnetic characterization further supports these findings.

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U2 - 10.1021/jp901077c

DO - 10.1021/jp901077c

M3 - Article

AN - SCOPUS:67649160774

SN - 1932-7447

VL - 113

SP - 8606

EP - 8615

JO - JOURNAL OF PHYSICAL CHEMISTRY C

JF - JOURNAL OF PHYSICAL CHEMISTRY C

IS - 20

ER -

A Structural and magnetic investigation of the inversion degree in ferrite nanocrystals mfe₂o₄ (M = Mn, Co, Ni)

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