| NUKLEONIKA 2013, 58(1):73-76
HYPERFINE INTERACTIONS IN (Cr0.9957Fe0.01)3+xSi1-xDariusz Satu³a1, Krzysztof Szymañski1, Wojciech Olszewski1, Beata Kalska-Szostko2, Janusz Waliszewski1, Katarzyna Reæko1 1 University of Bialystok, Faculty of Physics, 41 Lipowa Str., 15-424 Bia³ystok, Poland 2 University of Bialystok, Institute of Chemistry, 1 Hurtowa Str., 15-399 Bia³ystok, Poland X-ray diffraction measurements and Mössbauer spectroscopy with external magnetic field were carried out on (Cr0.9957Fe0.01)3+xSi1–x alloys. The Mössbauer spectra for A15 type of structure can be described by superposition of single line S(1) and two doublets D(1) and D(2). The relative ratio of the S(1) and D(2) strongly depends on x. The nearest neighbours of these components have been identified. It was shown that 57Fe atoms preferentially locate in Cr positions for x =< 0.0, while for x > 0.0 iron atoms are distributed both in Cr and Si positions. It was shown that, in A15 structure, one Cr atom located in the 57Fe nearest neighbours (n.n.) decreases isomer shift by (0.022 ± 0.002) mm/s, while one Si in n.n. increases isomer shift by (0.09 +/- 0.01) mm/s. The measured Mössbauer spectra of bcc Cr-Si indicate that atoms are randomly distributed and can be well described as superposition of single lines, related to various local environments of 57Fe atoms. Close X |