Letter | Published:

Defect Lattices and Catalytic Activity

Nature volume 141, page 1055 (11 June 1938) | Download Citation



A RECENT X-ray examination of the nickel-aluminium system1 revealed the existence of the following phase-structures: Ni3Al, Ni2Al3, and NiAl3, in addition to the solid solutions of aluminium in nickel and nickel in aluminium. Ni3Al is face-centred cubic and has a superlattice in which nickel atoms are at the centres of the cube faces while aluminium is at the cube corners. NiAl is body-centred cubic with aluminium at cube corners and nickel at cube centres. It was found that alloys with the NiAl type of phase structure were progressively more deficient in nickel atoms at cube centres, leaving vacant sites as the aluminium content of the alloy was increased. The absence of one third the number of nickel atoms changes the composition from NiAl to Ni2Al3 and produces a debasement from cubic symmetry to trigonal. The δ-phase structure Ni2Al3 can best be thought of as a deformed NiAl type. The empty sites in the structure are regularly distributed in planes perpendicular to the trigonal axis.

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  1. 1.

    , and , Proc. Roy. Soc., A, 159, 56 (1937). Phil. Mag., 23, 1049 (1937).

  2. 2.

    , Trans. Faraday Soc., 31, 1547 (1935).

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  1. Department of Chemistry, King's College, Newcastle-upon-Tyne, 2.

    • A. TAYLOR
    •  & J. WEISS


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