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Neutron diffraction and susceptibility measurements have been performed to investigate the anomalous transition from antiferro-to ferromagnetic order which takes place in the ternary intermetallic compound TbNiAl when Ni is substituted for Cu within the same crystal structure. The transition is anomalous because 1) a few per cent of Cu already suppresses antiferromagnetism, 2) both ferro-and antiferromagnetic types of order coexist in different "domains" in the transition range 0.01 ≤ x ≤ 0.10, and 3) the balance between both types of domains further depends on temperature.

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AbslrscL The temperalure dependence of lhe lattice parameten in the @-phase (BCC suuclum) of pure Zr and Zr-2 at.%Co was delemined between 900 and 1550T by neutron diffraction. All diffraction pattems show a high diffuse background. which is identified as thermal diffuse scaltering and originales from particular low-energy phonons in BCC Zr and its alloys. The latlice parameter of pure BCC Zr is given by az, = 3.14( 17)~10-~T+3.579(5) in A (T in K), Alloyingwith CO resullsin a contraction of BCC Zr, from which it is concluded that CO is diuolved substitulionally. The consequences of these resulls for the fast diffusion of CO in BCC Z r are discussed. 487 85 239 B 43 10948 B 43 10933 &. B 43 10963