Abstract
ErFeMn intermetallic alloy after exposure to high hydrogen pressure transformed into the ErFeMnH4.7 hydride. Both parent material and hydride were investigated for their structural, electronic and magnetic properties by synchrotron XRD (x-ray diffraction), XANES (x-ray absorption near edge structure) and SQUID (superconducting quantum interference device), respectively. Hydrogenation did not change the structure symmetry but caused large expansion of the lattice parameters. Mn and Fe K-edge XANES study of the parent alloy and its hydride reveals that charge on both Mn and Fe atoms remains the same and slightly increases after hydrogenation. Hydrogenation of ErFeMn alloy also caused decrease in the magnetic moment.
Highlights
PII: S1367-2630(07)49233-3 © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft δ(x = 3.2–3.65) and ε(x = 4) were reported for the ErFe2Hx hydride system
The calculated and experimental room temperature x-ray diffraction (XRD) patterns of ErFeMn and ErFeMnH4.7 are presented in figures 1(a) and (b), respectively
In the present investigation ErFeMn XRD pattern was indexed in a cubic structure and the structure was refined on the basis of the Fd-3m space group by the Rietveld method
Summary
The studies related to hydrogen influence on the properties of alloys between ErFe2 and ErMn2 have so far been limited to low hydrogen pressures [7, 23], below the pressure range in which the orthorhombic [2] or novel cubic hydride [3]–[5] can be formed. One of our goals is the determination of areas of existence of the orthorhombic ErFe2H5-based and cubic RMn2H6based hydrides in the R(Mnx Fe1−x )2-hydrogen system. The first step was treatment of ErMnFe alloy under high hydrogen pressure and characterization of received hydride by synchrotron x-ray diffraction (XRD), x-ray absorption near edge structure (XANES) and superconducting quantum interference device (SQUID) to understand their crystal and electronic structures and magnetic properties
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