Magnetic fluctuations of goethite (α-FeOOH) analyzed through Al substituted samples

D. F. Valezi; J. T. Maeda; B. L.S. Vicentin; A. C.G. Mantovani; J. C. Spadotto; A. Urbano; F. F. Ivashita; A. Paesano; C. J. Magon; E. Di Mauro

doi:10.1016/j.physb.2022.414537

Magnetic fluctuations of goethite (α-FeOOH) analyzed through Al substituted samples

D. F. Valezi^*, J. T. Maeda, B. L.S. Vicentin, A. C.G. Mantovani, J. C. Spadotto, A. Urbano, F. F. Ivashita, A. Paesano, C. J. Magon, E. Di Mauro

^*Corresponding author for this work

Materials Engineering

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

Abstract

Goethite is a Fe³⁺ oxide-hydroxide very common in nature. At room temperature it shows an antiferromagnetic ordering, with Néel temperature of 400 K. Despite this, it is well known that it also presents magnetic fluctuations, whose origins are still under discussion in the literature. For this research, goethite samples were synthesized with and without Al substitutions. Micrographs obtained by transmission electron microscopy (TEM) showed the presence of defects, as kinks and steps, at the rod-shaped particles of samples with Al substitutions. With Electron Spin Resonance (ESR) and Mössbauer experiments, it was observed an increase in the magnetic fluctuations in these samples, due to imbalanced spins. Such effect was related to magnetic mismatch caused by the presence of Al ions at the goethite structure. This mismatch can be caused by the increase of crystalline defects, such as grain boundaries, or due to the proximity of Fe ions to diaspore-like clusters.

Original language	English
Article number	414537
Journal	Physica B: Condensed Matter
Volume	650
DOIs	https://doi.org/10.1016/j.physb.2022.414537
Publication status	Published - 1 Feb 2023

Keywords

Al-FeOOH
EPR
ESR
Mössbauer
Weak ferromagnetism

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10.1016/j.physb.2022.414537

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title = "Magnetic fluctuations of goethite (α-FeOOH) analyzed through Al substituted samples",

abstract = "Goethite is a Fe3+ oxide-hydroxide very common in nature. At room temperature it shows an antiferromagnetic ordering, with N{\'e}el temperature of 400 K. Despite this, it is well known that it also presents magnetic fluctuations, whose origins are still under discussion in the literature. For this research, goethite samples were synthesized with and without Al substitutions. Micrographs obtained by transmission electron microscopy (TEM) showed the presence of defects, as kinks and steps, at the rod-shaped particles of samples with Al substitutions. With Electron Spin Resonance (ESR) and M{\"o}ssbauer experiments, it was observed an increase in the magnetic fluctuations in these samples, due to imbalanced spins. Such effect was related to magnetic mismatch caused by the presence of Al ions at the goethite structure. This mismatch can be caused by the increase of crystalline defects, such as grain boundaries, or due to the proximity of Fe ions to diaspore-like clusters.",

keywords = "Al-FeOOH, EPR, ESR, M{\"o}ssbauer, Weak ferromagnetism",

author = "Valezi, {D. F.} and Maeda, {J. T.} and Vicentin, {B. L.S.} and Mantovani, {A. C.G.} and Spadotto, {J. C.} and A. Urbano and Ivashita, {F. F.} and A. Paesano and Magon, {C. J.} and {Di Mauro}, E.",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2023",

month = feb,

day = "1",

doi = "10.1016/j.physb.2022.414537",

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T1 - Magnetic fluctuations of goethite (α-FeOOH) analyzed through Al substituted samples

AU - Valezi, D. F.

AU - Maeda, J. T.

AU - Vicentin, B. L.S.

AU - Mantovani, A. C.G.

AU - Spadotto, J. C.

AU - Urbano, A.

AU - Ivashita, F. F.

AU - Paesano, A.

AU - Magon, C. J.

AU - Di Mauro, E.

PY - 2023/2/1

Y1 - 2023/2/1

N2 - Goethite is a Fe3+ oxide-hydroxide very common in nature. At room temperature it shows an antiferromagnetic ordering, with Néel temperature of 400 K. Despite this, it is well known that it also presents magnetic fluctuations, whose origins are still under discussion in the literature. For this research, goethite samples were synthesized with and without Al substitutions. Micrographs obtained by transmission electron microscopy (TEM) showed the presence of defects, as kinks and steps, at the rod-shaped particles of samples with Al substitutions. With Electron Spin Resonance (ESR) and Mössbauer experiments, it was observed an increase in the magnetic fluctuations in these samples, due to imbalanced spins. Such effect was related to magnetic mismatch caused by the presence of Al ions at the goethite structure. This mismatch can be caused by the increase of crystalline defects, such as grain boundaries, or due to the proximity of Fe ions to diaspore-like clusters.

AB - Goethite is a Fe3+ oxide-hydroxide very common in nature. At room temperature it shows an antiferromagnetic ordering, with Néel temperature of 400 K. Despite this, it is well known that it also presents magnetic fluctuations, whose origins are still under discussion in the literature. For this research, goethite samples were synthesized with and without Al substitutions. Micrographs obtained by transmission electron microscopy (TEM) showed the presence of defects, as kinks and steps, at the rod-shaped particles of samples with Al substitutions. With Electron Spin Resonance (ESR) and Mössbauer experiments, it was observed an increase in the magnetic fluctuations in these samples, due to imbalanced spins. Such effect was related to magnetic mismatch caused by the presence of Al ions at the goethite structure. This mismatch can be caused by the increase of crystalline defects, such as grain boundaries, or due to the proximity of Fe ions to diaspore-like clusters.

KW - Al-FeOOH

KW - EPR

KW - ESR

KW - Mössbauer

KW - Weak ferromagnetism

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DO - 10.1016/j.physb.2022.414537

M3 - Article

AN - SCOPUS:85144044320

SN - 0921-4526

VL - 650

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

M1 - 414537

ER -

Magnetic fluctuations of goethite (α-FeOOH) analyzed through Al substituted samples

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Keywords

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