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- W1978681392 abstract "Abstract Seven alloys near the LaNi2 composition were studied by metallographie and X-ray techniques. Alloys that were cooled slowly were found to consist of two phases: from x = 1.75 to 2.25 and from x = 2.40 to 2.50, where x is the Ni:La ratio. A single-phase alloy was found near x = 2.30. A complete single-crystal structure analysis showed that the true composition of this tetragonal phase ( a = 7.355 A and c = 14.51 A ) is LaNi2.286. The space group is I42m and the unit cell contains 32 nickel atoms and 14 lanthanum atoms. This tetragonal structure is related to the cubic C15 Laves phase such that at ≈ ac and ct ≈ 2ac and two lanthanum atoms are removed from the tetragonal structure. The formation of this phase is thought to result from the large disparity between the lanthanum and nickel radii ( r La r Ni = 1.506 ) relative to that expected for the ideal constituent atoms of the AB2 cubic Laves phase ( r A r B = 1.225 ), which prevents the formation of the ideal C15 Laves phase." @default.
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- W1978681392 date "1988-11-01" @default.
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- W1978681392 title "Structure of LaNi2.286 and the LaNi system from LaNi1.75 to LaNi2.50" @default.
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- W1978681392 doi "https://doi.org/10.1016/0022-5088(88)90357-8" @default.
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