Strain development during the phase transition of La(Fe,Mn,Si){sub 13}H{sub z}

Journal Article · Mon Aug 01 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4960358· OSTI ID:22594393

Nielsen, Kaspar K.; Smith, Anders; Norby, Poul; Bahl, Christian R. H. ^[1]; Ståhl, Kenny ^[2]

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1. Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde (Denmark)
2. Department of Chemistry, Technical University of Denmark, Anker Engelunds Vej, DK-2800 Lyngby (Denmark)

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){sub 13}H{sub z} 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 (T{sub C}) occurring continuously in a temperature range of about 5 K around T{sub C.} 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.

• OSTI ID: 22594393
• Journal Information: Applied Physics Letters, Vol. 109, Issue 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRACKING
CURIE POINT
IRON
LANTHANUM COMPOUNDS
MANGANESE
MICROSTRUCTURE
PARAMAGNETISM
PEAKS
PHASE TRANSFORMATIONS
POWDERS
SILICON
STRAINS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
X RADIATION
X-RAY DIFFRACTION