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The angular distributions of γ rays and α particles from oriented 250 Bk, 253,254 Es, and 255 Fm nuclei were investigated to extract hyperfine interaction information for these actinide impurities in an iron host lattice. The hyperfine field of einsteinium in iron was found to be |B hf (EsFe|) = 396(32) T. With this value the magnetic moment of 254 Es was then determined as |µ| = 4.35(41) µ N .

PACS 71.20. Lp, 75.25.+ z, 76.80.+ y Mössbauer spectroscopy has been used to investigate the hyperfine field distributions and the local spin configurations of Fe atoms in the magnetically ordered Ti(Fe 1-x Al x ) 2 compounds. The evolution of the spin arrangement of the Fe atoms was observed over the concentration range 0 ≤ x ≤ 0.25 at 5 K. The Al impurity suppresses the ferromagnetic exchange in the Fe(6h) layers and simultaneously provides the conditions for a transition of the Fe(2a) atoms, which are nonmagnetic in the TiFe 2 compound, to the states with nonzero magnetic moment. The magnetic behavior of the Fe(2a) atoms is the key factor governing the anti-to ferromagnetic transition in the Ti(Fe 1-x Al x ) 2 compounds. The magnetic ordering temperatures of the Ti(Fe 1-x Al x ) 2 compounds were determined. In addition, the parameters of the electric-field gradient in TiFe 2 as well as the relationship between the value of the magnetic moment of the Fe atom and the type of atomic configuration were discussed.

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