Superparamagnetic Behavior of Zn and Al Substituted Cobalt Nanoferrites

J. Z. Msomi; S. J. Masuku; T. A. Nhlapo; T. Moyo; A. M. Strydom; D. Britz; T. P. Jili

doi:10.1007/s10948-019-5036-1

Superparamagnetic Behavior of Zn and Al Substituted Cobalt Nanoferrites

J. Z. Msomi^*, S. J. Masuku, T. A. Nhlapo, T. Moyo, A. M. Strydom, D. Britz, T. P. Jili

^*Corresponding author for this work

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

2 Citations (Scopus)

Abstract

Nanostructured Zn- and Al-doped cobalt spinel ferrites Zn_xCo_1-xFe_2-xAl_xO₄ (0 ≤ x ≤ 1.0) with particle size in the range of 7–13 nm were synthesized by glycol-thermal reaction. XRD analysis confirmed single-phase cubic spinel structure with no impurity phases. The Mössbauer spectra for Zn- and Al-substituted fine powders could be resolved into two quadrupole doublets associated with ⁵⁷Fe nuclei in paramagnetic spin phase. An unusual reducing magnetization with increasing particle size has been observed. The field cooled and zero field cooled magnetization measurements show superparamagnetic nanoparticles in the compounds investigated. The blocking temperatures (T_B) are sensitive to particle size. Larger particles are blocked at higher temperatures compared to smaller particles at the same field.

Original language	English
Pages (from-to)	2793-2797
Number of pages	5
Journal	Journal of Superconductivity and Novel Magnetism
Volume	32
Issue number	9
DOIs	https://doi.org/10.1007/s10948-019-5036-1
Publication status	Published - 1 Sept 2019
Externally published	Yes

Keywords

Ferrites
Magnetization
Mössbauer spectra
Nanoparticle

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10.1007/s10948-019-5036-1

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title = "Superparamagnetic Behavior of Zn and Al Substituted Cobalt Nanoferrites",

abstract = "Nanostructured Zn- and Al-doped cobalt spinel ferrites ZnxCo1-xFe2-xAlxO4 (0 ≤ x ≤ 1.0) with particle size in the range of 7–13 nm were synthesized by glycol-thermal reaction. XRD analysis confirmed single-phase cubic spinel structure with no impurity phases. The M{\"o}ssbauer spectra for Zn- and Al-substituted fine powders could be resolved into two quadrupole doublets associated with 57Fe nuclei in paramagnetic spin phase. An unusual reducing magnetization with increasing particle size has been observed. The field cooled and zero field cooled magnetization measurements show superparamagnetic nanoparticles in the compounds investigated. The blocking temperatures (TB) are sensitive to particle size. Larger particles are blocked at higher temperatures compared to smaller particles at the same field.",

keywords = "Ferrites, Magnetization, M{\"o}ssbauer spectra, Nanoparticle",

author = "Msomi, {J. Z.} and Masuku, {S. J.} and Nhlapo, {T. A.} and T. Moyo and Strydom, {A. M.} and D. Britz and Jili, {T. P.}",

note = "Publisher Copyright: {\textcopyright} 2019, Springer Science+Business Media, LLC, part of Springer Nature.",

year = "2019",

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doi = "10.1007/s10948-019-5036-1",

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T1 - Superparamagnetic Behavior of Zn and Al Substituted Cobalt Nanoferrites

AU - Msomi, J. Z.

AU - Masuku, S. J.

AU - Nhlapo, T. A.

AU - Moyo, T.

AU - Strydom, A. M.

AU - Britz, D.

AU - Jili, T. P.

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Nanostructured Zn- and Al-doped cobalt spinel ferrites ZnxCo1-xFe2-xAlxO4 (0 ≤ x ≤ 1.0) with particle size in the range of 7–13 nm were synthesized by glycol-thermal reaction. XRD analysis confirmed single-phase cubic spinel structure with no impurity phases. The Mössbauer spectra for Zn- and Al-substituted fine powders could be resolved into two quadrupole doublets associated with 57Fe nuclei in paramagnetic spin phase. An unusual reducing magnetization with increasing particle size has been observed. The field cooled and zero field cooled magnetization measurements show superparamagnetic nanoparticles in the compounds investigated. The blocking temperatures (TB) are sensitive to particle size. Larger particles are blocked at higher temperatures compared to smaller particles at the same field.

AB - Nanostructured Zn- and Al-doped cobalt spinel ferrites ZnxCo1-xFe2-xAlxO4 (0 ≤ x ≤ 1.0) with particle size in the range of 7–13 nm were synthesized by glycol-thermal reaction. XRD analysis confirmed single-phase cubic spinel structure with no impurity phases. The Mössbauer spectra for Zn- and Al-substituted fine powders could be resolved into two quadrupole doublets associated with 57Fe nuclei in paramagnetic spin phase. An unusual reducing magnetization with increasing particle size has been observed. The field cooled and zero field cooled magnetization measurements show superparamagnetic nanoparticles in the compounds investigated. The blocking temperatures (TB) are sensitive to particle size. Larger particles are blocked at higher temperatures compared to smaller particles at the same field.

KW - Ferrites

KW - Magnetization

KW - Mössbauer spectra

KW - Nanoparticle

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JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

IS - 9

ER -

Superparamagnetic Behavior of Zn and Al Substituted Cobalt Nanoferrites

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