Conversion electron Mössbauer spectroscopy study of iron disilicide films grown by MBE

CEMS Study of the Interface Formation in the Fe-Si System during Pulsed Laser Deposition

“…This is consistent with the quadrupole-split c-FeSi line as shown in Fig. 4, d 0:23(1), G 0:46(2), and D 0:34(2) mm/s, although the (average) splitting observed here is smaller than that of an expitaxial sample containing 50% vacancies [33] and also slightly smaller than for the crystalline as-grown phase in the multilayers [21]. The latter phase was obtained from a disordered phase formed with <2 nm of Si on Fe by further deposition and presumably in-diffusion of Fe at 300 K. Analogously, both crystalline, but defect-rich c-FeSi phases formed here upon annealing approach the FeSi stoichiometry by in-diffusion of Si and Fe, respectively.…”

“…This fraction should be observable and is presumably contributing, apart from strain, to the observed rather large line width, G % 0:5± 0.7 mm/s. In contrast, for the Si/Fe case a larger quadrupole splitting is expected as observed previously for Fe atoms with next-nearest neighbour Fe vacancies in c-FeSi [9,33]. This is consistent with the quadrupole-split c-FeSi line as shown in Fig.…”

Evolution under thermal annealing of Mn-doped iron disilicides obtained by ball milling

“…Line widths slightly decrease in comparison with those reported for the as-milled samples [12]. Now, differently from this previous work [12] and in good agreement with the present XRD patterns, the two interactions associated with Fe I and Fe II sites in β-FeSi 2 [7,14] together with the ε-FeSi signal [15] could be unambiguously assigned.…”

Phase stabilization in the Fe1−xMnxSi2 system induced by ball milling

“…The interaction I 3 could be ascribed to the Fe II site of a-FeSi 2 structure [17]. Due to interaction I 1 is shared between a-FeSi 2 and 3-FeSi and the fact that the relative populations of fractions of Fe I and Fe II sites of a-FeSi 2 are strongly dependent on the content of Fe vacancies in the lattice [18,19], it was not possible to extract the relative amounts of a-FeSi 2 and 3-FeSi phases present in the samples. However, according to the X-ray results, only traces of 3-FeSi were present in the B-type samples.…”