Local magnetic moment configurations in non-stoichiometric intermetallic compounds, UCuxGe (x = 0.90, 0.95 or 0.98) and UCuGey (y = 0.90 or 0.95), were studied by means of Mössbauer spectroscopy at 10 to 100K. The 119Sn nuclei in Sn atoms doped into Ge sites were used as local probes. Vacancies on the Ge sites in UCuGey seemed to have no great influence on the original magnetic structure. On the other hand, 2 so-called new magnetic moment configurations, which coexisted with the original magnetic structure at low temperatures, were observed in Cu-poor samples. Changes in the mutual orientation of the U magnetic moments in the new (perturbed) magnetic structure were attributed to vacancy-induced variations in the effective exchange fields.

 

Influence of Vacancies on the Magnetic Structure of UCuGe. V.I.Krylov, N.N.Delyagin, S.I.Reyman, I.N.Rozantsev, A.V.Andreev, V.Sechovský: Journal of Alloys and Compounds, 2002, 347[1-2], 36-42

 

 Table 7

 Diffusivity of B in Zr41Be20Ti16.5Cu12.5Ni10

 

 

 

Temperature (K)

Diffusivity (m2/s)

513

4.45 x 10-23

533

2.02 x 10-22

551

9.86 x 10-22

555

1.49 x 10-21

573

3.66 x 10-21

585

9.01 x 10-21

612

3.79 x 10-20

628

1.19 x 10-19

642

4.45 x 10-19

653

7.11 x 10-19

657

1.64 x 10-18