Strained-tetrahedra statistical model for atomic distances and site occupations in ternary intermetallic M3(XX′) structures Ni3(AlFe) case
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| Title: | Strained-tetrahedra statistical model for atomic distances and site occupations in ternary intermetallic M |
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| Authors: | Robouch, B.V. benjamin.robouch@tin.it, Burattini, E., Kisiel, A., Suvorov, A.L., Zaluzhnyi, A.G. |
| Source: | Journal of Alloys & Compounds. Sep2003, Vol. 359 Issue 1/2, p73. 6p. |
| Subjects: | Intermetallic compounds, Alloys, Transition metals |
| Abstract: | The strained-tetrahedra statistical model is applied to intermetallic M3(XX′) alloys aiming to determine from EXAFS data, elemental tetrahedron preferences and structural dimensions. Atoms M∈{Ni, Co, Cu} and X∈{Al, Ti, Nb, Mo, Hf, Ta, W, Fe, Cr, Mn} form face-centered-cubic crystal cell M3X binary intermetallic compounds with Cu3Au ordering. Ternary intermetallic alloys can be of the type M3(X1−xX′x)1 or (M1−yM′y)3X1. As per the literature, atoms of each set cling to their respective ‘M face’ and ‘X corner’ sublattice sites, while X″∈{Fe, Cr, Mn} atoms beyond a threshold overall relative content cM≤3/4 also invade the ‘corner’ sublattice, behaving like M″ atoms. With this in mind, the model is applied to Ni3(Al1−xFex)1 EXAFS data of the intermetallic (with Ni>75%) to determine Fe-atom site occupation preferences (with respect to random). The resulting five values are {1, 1.10, 0.85, 1.33, 1}. The physical, stoichiometric conditions imposed by the statistical model show that only four of the five tetrahedral configurations occur in Ni3AlFe, analogous to what is observed in semiconducting II–VI group ternaries with Mn, a transition element. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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