Strain development during the phase transition of La(Fe,Mn,Si)13Hz

Henrique Neves Bez, Kaspar Kirstein Nielsen, Anders Smith, Poul Norby, Kenny Ståhl, Christian R H Bahl

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Abstract

We use powder X-ray diffraction to evaluate the temperature dependence of the crystalline properties during the magnetic phase transition of La(Fe,Mn,Si)13Hz as a function of the Fe/Mn/Si ratio. Both the paramagnetic and ferromagnetic phases were observed as peak overlaps in the patterns around the Curie temperature (TC) occurring continuously in a temperature range of about 5 K around TC. Using the Williamson-Hall method, we evaluate the strain developing in the crystallites during the transition and find that it is associated with the growth of the paramagnetic phase as the transition occurs. Based on our measurements and microstructure analyses, we propose that cracking during the phase transition is due to or aggravated by the small content of a La-rich phase.
Original languageEnglish
Article number051902
JournalApplied Physics Letters
Volume109
Issue number5
Number of pages4
ISSN0003-6951
DOIs
Publication statusPublished - 2016

Keywords

  • X-ray diffraction
  • Magnetic materials
  • Cracks
  • Curie point
  • Materials modification

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