Open AccessNear-neighbor mixing and bond dilation in mechanically alloyed Cu-Fe
Author(s) -
Vincent G. Harris,
K. M. Kemner,
B. N. Das,
N. C. Koon,
A. E. Ehrlich,
J. P. Kirkland,
J. C. Woicik,
P. Crespo,
A. Hernando,
A. Garcı́a-Escorial
Publication year - 1996
Publication title -
physical review. b, condensed matter
Language(s) - English
Resource type - Journals
eISSN - 1095-3795
pISSN - 0163-1829
DOI - 10.1103/physrevb.54.6929
Subject(s) - extended x ray absorption fine structure , materials science , bond length , crystallography , metastability , stoichiometry , coordination number , diffraction , x ray absorption fine structure , lattice (music) , solid solution , chemical bond , crystal structure , absorption spectroscopy , chemistry , spectroscopy , physics , ion , metallurgy , quantum mechanics , acoustics , optics
Extended x-ray-absorption fine-structure (EXAFS) measurements were used to obtain element- specific, structural, and chemical information of the local environments around Cu and Fe atoms in high-energy ballmilled Cu_Fe_(12-X) samples (x=0.50 and 0.70). Analysis of the EXAFS data shows both Fe and Cu atoms reside in face-centered-cubic sites where the first coordination sphere consists of a mixture of Fe and Cu atoms in a ratio which reflects the as-Prepared stoichiometry. The measured bond distances indicate a dilation in the bonds between unlike neighbors which accounts for the lattice expansion measured by x-ray diffraction. These results indicate that metastable alloys having a positive heat of mixing can be prepared via the high-energy ballmilling process
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