Magnetic Property Enhancement of Spinel Mn-Zn Ferrite through Atomic Structure Control

Jennifer Hölscher; Michele Petrecca; Martin Albino; Pelle Gorm Garbus; Matilde Saura-Múzquiz; Claudio Sangregorio; Mogens Christensen

doi:10.1021/acs.inorgchem.0c01809

Magnetic Property Enhancement of Spinel Mn-Zn Ferrite through Atomic Structure Control

Jennifer Hölscher, Michele Petrecca, Martin Albino, Pelle Gorm Garbus, Matilde Saura-Múzquiz, Claudio Sangregorio, Mogens Christensen^*

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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Abstract

Temperature treatment of magnetic Mn-Zn ferrites with the composition Mn0.6Zn0.2Fe2.2O4 up to 1100 °C results in a tremendous enhancement of the saturation magnetization by more than 60%. Employing a robust combined Rietveld refinement of powder X-ray and neutron diffraction (PXRD and NPD) data, it is revealed how a reordering of the cations takes place during the annealing step, the extent of which depends on the annealing temperature. While Zn(II) exclusively occupies tetrahedral sites throughout the whole temperature range, as the annealing temperature increases up to 700 °C, the Mn(II) cation distribution shifts from 80(7)% of the total Mn content occupying the octahedral sites (partly inverse spinel) to Mn only being present on the tetrahedral sites (normal spinel). Above 700 °C, pronounced crystallite growth is observed, followed by an increase of the saturation magnetization. Complementary techniques such as energy dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM) confirm an even cation distribution and the particle growth with annealing temperature. The structural changes caused by annealing of spinel ferrites directly alter the magnetic properties of the materials, thus serving as an easy handle for enhancing their magnetic properties.

Original language	English
Journal	Inorganic Chemistry
Volume	59
Issue	15
Pages (from-to)	11184-11192
Number of pages	9
ISSN	0020-1669
DOIs	https://doi.org/10.1021/acs.inorgchem.0c01809
Publication status	Published - Aug 2020

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10.1021/acs.inorgchem.0c01809

Magnetic Property Enhancement of Spinel Mn–Zn Ferrite through Atomic Structure ControlAccepted manuscript, 1.26 MBLicence: Other

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title = "Magnetic Property Enhancement of Spinel Mn-Zn Ferrite through Atomic Structure Control",

abstract = "Temperature treatment of magnetic Mn-Zn ferrites with the composition Mn0.6Zn0.2Fe2.2O4 up to 1100 °C results in a tremendous enhancement of the saturation magnetization by more than 60%. Employing a robust combined Rietveld refinement of powder X-ray and neutron diffraction (PXRD and NPD) data, it is revealed how a reordering of the cations takes place during the annealing step, the extent of which depends on the annealing temperature. While Zn(II) exclusively occupies tetrahedral sites throughout the whole temperature range, as the annealing temperature increases up to 700 °C, the Mn(II) cation distribution shifts from 80(7)% of the total Mn content occupying the octahedral sites (partly inverse spinel) to Mn only being present on the tetrahedral sites (normal spinel). Above 700 °C, pronounced crystallite growth is observed, followed by an increase of the saturation magnetization. Complementary techniques such as energy dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM) confirm an even cation distribution and the particle growth with annealing temperature. The structural changes caused by annealing of spinel ferrites directly alter the magnetic properties of the materials, thus serving as an easy handle for enhancing their magnetic properties. ",

author = "Jennifer H{\"o}lscher and Michele Petrecca and Martin Albino and Garbus, {Pelle Gorm} and Matilde Saura-M{\'u}zquiz and Claudio Sangregorio and Mogens Christensen",

year = "2020",

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T1 - Magnetic Property Enhancement of Spinel Mn-Zn Ferrite through Atomic Structure Control

AU - Hölscher, Jennifer

AU - Petrecca, Michele

AU - Albino, Martin

AU - Garbus, Pelle Gorm

AU - Saura-Múzquiz, Matilde

AU - Sangregorio, Claudio

AU - Christensen, Mogens

PY - 2020/8

Y1 - 2020/8

N2 - Temperature treatment of magnetic Mn-Zn ferrites with the composition Mn0.6Zn0.2Fe2.2O4 up to 1100 °C results in a tremendous enhancement of the saturation magnetization by more than 60%. Employing a robust combined Rietveld refinement of powder X-ray and neutron diffraction (PXRD and NPD) data, it is revealed how a reordering of the cations takes place during the annealing step, the extent of which depends on the annealing temperature. While Zn(II) exclusively occupies tetrahedral sites throughout the whole temperature range, as the annealing temperature increases up to 700 °C, the Mn(II) cation distribution shifts from 80(7)% of the total Mn content occupying the octahedral sites (partly inverse spinel) to Mn only being present on the tetrahedral sites (normal spinel). Above 700 °C, pronounced crystallite growth is observed, followed by an increase of the saturation magnetization. Complementary techniques such as energy dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM) confirm an even cation distribution and the particle growth with annealing temperature. The structural changes caused by annealing of spinel ferrites directly alter the magnetic properties of the materials, thus serving as an easy handle for enhancing their magnetic properties.

AB - Temperature treatment of magnetic Mn-Zn ferrites with the composition Mn0.6Zn0.2Fe2.2O4 up to 1100 °C results in a tremendous enhancement of the saturation magnetization by more than 60%. Employing a robust combined Rietveld refinement of powder X-ray and neutron diffraction (PXRD and NPD) data, it is revealed how a reordering of the cations takes place during the annealing step, the extent of which depends on the annealing temperature. While Zn(II) exclusively occupies tetrahedral sites throughout the whole temperature range, as the annealing temperature increases up to 700 °C, the Mn(II) cation distribution shifts from 80(7)% of the total Mn content occupying the octahedral sites (partly inverse spinel) to Mn only being present on the tetrahedral sites (normal spinel). Above 700 °C, pronounced crystallite growth is observed, followed by an increase of the saturation magnetization. Complementary techniques such as energy dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM) confirm an even cation distribution and the particle growth with annealing temperature. The structural changes caused by annealing of spinel ferrites directly alter the magnetic properties of the materials, thus serving as an easy handle for enhancing their magnetic properties.

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JO - Inorganic Chemistry

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Magnetic Property Enhancement of Spinel Mn-Zn Ferrite through Atomic Structure Control

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