An X-ray absorption spectroscopy study of La-Fe-Si-(H) magnetocaloric alloys
Source abstract
Abstract
Abstract In order to unveil the lattice structure of La-Fe-Si-(H) alloys from local atomic perspective and uncover its relation with macro-properties, local structural environments of La and Fe in stoichiometric and Fe-rich La-Fe-Si-(H) have been investigated by X-ray absorption fine structure (XAFS) technique. According to the curve-fitting and real space analysis of extended X-ray absorption fine structure (EXAFS) spectra at La L3-edge and Fe K-edge, we found that the interstitial hydrogen atoms preferentially occupy 24d site, which is not affected by the existence of second phase. X-ray absorption near edge structure (XANES) spectra of La atom give a clear evidence of valence electron transfer from hydrogen to Fe, indicating a close relation between electronic structure and capability of hydrogen absorption. The hybridization effect between Fe and Si is proved to play dominant role on Curie temperature (Tc) of La-Fe-Si alloys, but have limited influence on Tc for La-Fe-Si-(H) alloys. The study establishes strong correlation between the local structure and above properties in La-Fe-Si-(H) alloys.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Magnetic Properties of Alloys · Rare-earth and actinide compounds
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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