Aligned Permanent Magnet Made in Seconds: An In Situ Diffraction Study

Amalie P. Laursen; Jens P. Frandsen; Priyank Shyam; Mathias I. Mørch; Frederik H. Gjørup; Harikrishnan Vijayan; Mads R.V. Jørgensen; Mogens Christensen

doi:10.1002/aelm.202400077

Aligned Permanent Magnet Made in Seconds: An In Situ Diffraction Study

Amalie P. Laursen, Jens P. Frandsen, Priyank Shyam, Mathias I. Mørch, Frederik H. Gjørup, Harikrishnan Vijayan, Mads R.V. Jørgensen, Mogens Christensen^*

^*Corresponding author for this work

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

1 Citation (Scopus)

Abstract

The synthesis of a strontium hexaferrite magnet is studied using in situ synchrotron powder X-ray diffraction (PXRD) with a 16-ms time resolution. The precursor material is cold compacted shape-controlled goethite and strontium carbonate. The time evolution of the phases is modeled with sequential Rietveld refinements revealing that strontium hexaferrite forms within seconds at ≈1173 K. Texture analysis is performed on selected PXRD frames throughout the experiment, and the preferred orientation introduced by cold-pressing goethite prevails through the iron oxide phase transitions (goethite → hematite → strontium hexaferrite). Electron backscatter diffraction (EBSD) data on the final pellet confirms the preferred orientation observed with PXRD. The resulting magnet has respectable magnetic properties, considering the simplicity of the preparation method, with an energy product (BH_max) of 18.6(8) kJ m⁻³.

Original language	English
Article number	2400077
Journal	Advanced Electronic Materials
Volume	10
Issue	9
Number of pages	9
ISSN	2199-160X
DOIs	https://doi.org/10.1002/aelm.202400077
Publication status	Published - Sept 2024

Keywords

combined texture and Rietveld analysis
electron backscatter diffraction
in situ X-ray diffraction
permanent magnets
strontium hexaferrite
ultrafast sintering

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@article{fb0eb88670b8422580ab69567fbf82ee,

title = "Aligned Permanent Magnet Made in Seconds: An In Situ Diffraction Study",

abstract = "The synthesis of a strontium hexaferrite magnet is studied using in situ synchrotron powder X-ray diffraction (PXRD) with a 16-ms time resolution. The precursor material is cold compacted shape-controlled goethite and strontium carbonate. The time evolution of the phases is modeled with sequential Rietveld refinements revealing that strontium hexaferrite forms within seconds at ≈1173 K. Texture analysis is performed on selected PXRD frames throughout the experiment, and the preferred orientation introduced by cold-pressing goethite prevails through the iron oxide phase transitions (goethite → hematite → strontium hexaferrite). Electron backscatter diffraction (EBSD) data on the final pellet confirms the preferred orientation observed with PXRD. The resulting magnet has respectable magnetic properties, considering the simplicity of the preparation method, with an energy product (BHmax) of 18.6(8) kJ m−3.",

keywords = "combined texture and Rietveld analysis, electron backscatter diffraction, in situ X-ray diffraction, permanent magnets, strontium hexaferrite, ultrafast sintering",

author = "Laursen, {Amalie P.} and Frandsen, {Jens P.} and Priyank Shyam and M{\o}rch, {Mathias I.} and Gj{\o}rup, {Frederik H.} and Harikrishnan Vijayan and J{\o}rgensen, {Mads R.V.} and Mogens Christensen",

year = "2024",

month = sep,

doi = "10.1002/aelm.202400077",

language = "English",

volume = "10",

journal = "Advanced Electronic Materials",

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publisher = "Wiley-VCH Verlag",

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T2 - An In Situ Diffraction Study

AU - Laursen, Amalie P.

AU - Frandsen, Jens P.

AU - Shyam, Priyank

AU - Mørch, Mathias I.

AU - Gjørup, Frederik H.

AU - Vijayan, Harikrishnan

AU - Jørgensen, Mads R.V.

AU - Christensen, Mogens

PY - 2024/9

Y1 - 2024/9

N2 - The synthesis of a strontium hexaferrite magnet is studied using in situ synchrotron powder X-ray diffraction (PXRD) with a 16-ms time resolution. The precursor material is cold compacted shape-controlled goethite and strontium carbonate. The time evolution of the phases is modeled with sequential Rietveld refinements revealing that strontium hexaferrite forms within seconds at ≈1173 K. Texture analysis is performed on selected PXRD frames throughout the experiment, and the preferred orientation introduced by cold-pressing goethite prevails through the iron oxide phase transitions (goethite → hematite → strontium hexaferrite). Electron backscatter diffraction (EBSD) data on the final pellet confirms the preferred orientation observed with PXRD. The resulting magnet has respectable magnetic properties, considering the simplicity of the preparation method, with an energy product (BHmax) of 18.6(8) kJ m−3.

AB - The synthesis of a strontium hexaferrite magnet is studied using in situ synchrotron powder X-ray diffraction (PXRD) with a 16-ms time resolution. The precursor material is cold compacted shape-controlled goethite and strontium carbonate. The time evolution of the phases is modeled with sequential Rietveld refinements revealing that strontium hexaferrite forms within seconds at ≈1173 K. Texture analysis is performed on selected PXRD frames throughout the experiment, and the preferred orientation introduced by cold-pressing goethite prevails through the iron oxide phase transitions (goethite → hematite → strontium hexaferrite). Electron backscatter diffraction (EBSD) data on the final pellet confirms the preferred orientation observed with PXRD. The resulting magnet has respectable magnetic properties, considering the simplicity of the preparation method, with an energy product (BHmax) of 18.6(8) kJ m−3.

KW - combined texture and Rietveld analysis

KW - electron backscatter diffraction

KW - in situ X-ray diffraction

KW - permanent magnets

KW - strontium hexaferrite

KW - ultrafast sintering

UR - http://www.scopus.com/inward/record.url?scp=85195803527&partnerID=8YFLogxK

U2 - 10.1002/aelm.202400077

DO - 10.1002/aelm.202400077

M3 - Journal article

AN - SCOPUS:85195803527

SN - 2199-160X

VL - 10

JO - Advanced Electronic Materials

JF - Advanced Electronic Materials

IS - 9

M1 - 2400077

ER -

Aligned Permanent Magnet Made in Seconds: An In Situ Diffraction Study

Abstract

Keywords

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