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

Laursen, Amalie P. ; Frandsen, Jens P. ; Shyam, Priyank ; Mørch, Mathias I. ; Gjørup, Frederik H. LU orcid ; Vijayan, Harikrishnan ; Jørgensen, Mads R.V. LU orcid and Christensen, Mogens (2024) In Advanced Electronic Materials 10(9).
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... (More)

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.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
combined texture and Rietveld analysis, electron backscatter diffraction, in situ X-ray diffraction, permanent magnets, strontium hexaferrite, ultrafast sintering
in
Advanced Electronic Materials
volume
10
issue
9
publisher
Wiley-Blackwell
external identifiers
  • scopus:85195803527
ISSN
2199-160X
DOI
10.1002/aelm.202400077
language
English
LU publication?
yes
id
ad9ea2fb-a33e-484c-bb54-58495981a785
date added to LUP
2024-09-09 15:30:27
date last changed
2024-10-14 12:01:37
@article{ad9ea2fb-a33e-484c-bb54-58495981a785,
  abstract     = {{<p>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<sub>max</sub>) of 18.6(8) kJ m<sup>−3</sup>.</p>}},
  author       = {{Laursen, Amalie P. and Frandsen, Jens P. and Shyam, Priyank and Mørch, Mathias I. and Gjørup, Frederik H. and Vijayan, Harikrishnan and Jørgensen, Mads R.V. and Christensen, Mogens}},
  issn         = {{2199-160X}},
  keywords     = {{combined texture and Rietveld analysis; electron backscatter diffraction; in situ X-ray diffraction; permanent magnets; strontium hexaferrite; ultrafast sintering}},
  language     = {{eng}},
  number       = {{9}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Advanced Electronic Materials}},
  title        = {{Aligned Permanent Magnet Made in Seconds–An In Situ Diffraction Study}},
  url          = {{http://dx.doi.org/10.1002/aelm.202400077}},
  doi          = {{10.1002/aelm.202400077}},
  volume       = {{10}},
  year         = {{2024}},
}