Depth-Selective Study of Surface Crystallization in NANOPERM-Type Alloys

M. Miglierinia,b, T. Hatalaa, M. Bujdošc aInstitute of Nuclear and Physical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology in Bratislava, Ilkovičova 3, 812 19 Bratislava, Slovakia bRegional Centre of Advanced Technologies and Materials, Palacky University, 17. listopadu 12, 771 46 Olomouc, Czech Republic cInstitute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia

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Evolution of structure and magnetic order is studied in the 57Fe81Mo8Cu1B10 alloy by conversion: electron and conversion X-ray 57Fe Mössbauer spectrometry. Surface features exhibit differences at both sides of ribbon-shaped samples with respect to the screening depth. In the as-quenched state, traces of magnetite (in addition to bcc-Fe) are revealed only at the wheel side of the ribbon to the depth of about 200 nm. It is present also after annealing up to 510°C, then it disappears. In deeper regions (down to 1 μm), magnetite is less abundant. At the air side, only bcc-Fe is detected, though the progress of crystallization is more pronounced here than at the wheel side. Vibration properties of the bulk of amorphous and nanocrystalline samples are obtained from experiments of nuclear inelastic scattering of synchrotron radiation using partial densities of phonon states.

DOI: 10.12693/APhysPolA.126.56 PACS numbers: 76.80.+y, 75.70.i, 71.55.Jv, 65.80.-g, 63.22.-m, 63.50.-x