POSITRON DIAGNOSTICS OF FE–GA ALLOYS
https://doi.org/10.56304/S2079562926010082
EDN: BBQYOI
Abstract
In the present work we study dynamics of vacancy-type defects in Fe–Ga alloys (galfenols) with gallium content ranging from 16.5 to 33.0%. At the beginning, a brief overview of the basic properties and crystal structure of Fe–Ga alloys is presented. Positron Annihilation Lifetime Spectroscopy (PALS), Neutron Diffraction and X-Ray Diffraction (XRD) methods show a high degree of correlation in changes in the positron lifetime and phase composition of the samples. A comparison of positron data and the results of structural analysis reveal notably different behaviour of defects ordering in alloys with gallium content x higher and lower than 25%. All the alloys quenched at 1000°C demonstrate high concentration of iron monovacancies (>2 × 10−4 at−1), and positron lifetime linearly grows from ~160 ps at x = 16.5% to ~180 ps at x = 33.0% (tangent 1.5 ps/1%Ga). The observed changes of the positron lifetime correlate with phase composition of the samples.
About the Authors
L. Yu. Dubov
National Reasearch Centre “Kurchatov Institute”;
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
Yu. V. Shtotsky
National Reasearch Centre “Kurchatov Institute”;
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
O. V. Ilyukhina
National Reasearch Centre “Kurchatov Institute”
Russian Federation
Russian Federation
Yu. A. Akmalova
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
L. I. Budaeva
National Reasearch Centre “Kurchatov Institute”
Russian Federation
Russian Federation
S. V. Stepanov
National Reasearch Centre “Kurchatov Institute”;
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
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Review
For citations:
Dubov L.Yu., Shtotsky Yu.V., Ilyukhina O.V., Akmalova Yu.A., Budaeva L.I., Stepanov S.V. POSITRON DIAGNOSTICS OF FE–GA ALLOYS. Nuclear Physics and Engineering. 2026;17(1):12-21. (In Russ.) https://doi.org/10.56304/S2079562926010082. EDN: BBQYOI
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