Abstract
Abstract Hexagonal (C14) Laves-phase Zr(FexCr1−x)2 alloys with x=0.3, 0.4, 0.5, 0.6 and 0.7 have been prepared by arc melting and the corresponding hydrides have been formed by hydrogen uptake at 1 atm pressure. X-ray diffractograms have been measured and analyzed with the Rietveld method. 57Fe Mossbauer spectra, measured at room temperature, could be fitted with two doublets with 3:1 area ratio, corresponding to the two Fe sites in the C14 structure. The quadrupole splitting (Δ) and isomer shift (δ) dependences on x are discussed in terms of volume and charge effects. The hydrides showed volume expansions of up to 22% without any crystal structure change. Both Mossbauer hyperfine parameters Δ and δ increased markedly in the hydrides as compared to the alloys. Tetrahedral hole radii have been calculated from measured crystalline parameters and their relationship to hydrogen site preferences is discussed.
Published Version
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