Peculiarities of crystal structure and superfine interactions in alloys Ti-Co-Sn

S.O. Yuryev; S.I. Yushchuk; V.V. Moklyak; F.M. Gonchar; O.M. Gorina; B.B. Onyskiv

doi:10.15330/pcss.21.4.645-649

Authors

S.O. Yuryev Lviv Polytechnic National University
S.I. Yushchuk Lviv Polytechnic National University
V.V. Moklyak G. V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine
F.M. Gonchar Lviv Polytechnic National University
O.M. Gorina Lviv Polytechnic National University
B.B. Onyskiv Ivano-Frankivsk Scientific Research Forensic Center of the Ministry of Internal Affaris of Ukraine

DOI:

https://doi.org/10.15330/pcss.21.4.645-649

Keywords:

Heusler phases, Nuclear gamma resonance, magnetic field, isomeric shift

Abstract

Alloys with the general formula TiCo_2-хSn were produced by way of sintering primary components – pure metals in an argon atmosphere. The alloys were homogenized by annealing in the evacuated quartz vessel at T=1070 K during 500 h. X-ray diffraction analysis confirmed single-phase condition of all samples. Nuclear gamma resonance (NGR) analysis was made at T=295 and 80 K using radiation source BaSn¹¹⁹Sn. It was established, that Sn atoms in samples with x=0.6 and 1.0 are in two crystallographic positions, pyramids (1) and tetrahedrons (2) to which isomer shifts correspond (relative to SnO₂ 1.52-1.65 mm/s for Sn(1) and 2.99 mm/s for Sn(2). Zeeman splitting for Sn(1) in TiCo₂Sn takes place at T=295 and 80 K, and for compositions with x=0.3-1.0 at T=80 K only. For Sn(2) it is noted only in alloy TiCoSn at T=80 K. The conclusion has been made on the reason of formation of effective magnetic fields on non-magnetic tin atoms nuclei.

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