Semiconductor Physics, Quantum Electronics & Optoelectronics, 29 (3), P. 302-310 (2026).
DOI: https://doi.org/10.15407/spqeo29.03.302

Correlations between the dielectric properties, domain structure morphology and phase state of Bi_1–xSm_xFeO₃ nanoparticles

O.S. Pylypchuk¹, V.O. Kolupaiev¹, V.V. Vainberg¹, V.N. Poroshin¹, I.V. Fesych^2,3, L.D. Demchenko^4,5, E.A. Eliseev^6*, and A.N. Morozovska^1**

¹Institute of Physics, National Academy of Sciences of Ukraine, 46 Nauky Avenue, 03028 Kyiv, Ukraine
²Taras Shevchenko National University of Kyiv, 01030 Kyiv, Ukraine
³Donetsk Institute for Physics and Engineering named after O.O. Galkin, National Academy of Sciences of Ukraine
⁴Stockholm University, Department of Chemistry, Sweden
⁵Ye.O. Paton Institute of Materials Science and Welding, National Technical University of Ukraine
“Igor Sikorsky Kyiv Polytechnic Institute”, 37, Beresteisky Avenue, 03056 Kyiv, Ukraine,
⁶Frantsevich Institute for Problems in Materials Science, National Academy of Sciences of Ukraine,
3, Omeliana Pritsaka Str., 03142 Kyiv, Ukraine
Corresponding author e-mail: eugene.a.eliseev@gmail.com^*, anna.n.morozovska@gmail.com^**

Abstract. Nanoscale multiferroics are basic model objects for studying polar, magnetic, and magnetoelectric properties and mutual couplings. Bismuth-samarium ferrite (Bi_1–xSm_xFeO₃) is a model orthoferrite, whose polar, magnetic and magnetoelectric properties have been studied for the bulk and thin film samples. The properties of Bi_1–xSm_xFeO₃ nanoparticles have been much less studied, despite the nanoparticles can be used in a wide range of applications, such as energy storage, magnetic hyperthermia, and advanced nanoelectronics. In this work, we performed experimental measurements and analysis of the temperature dependence of the Bi_1–xSm_xFeO₃ nanopowder dielectric properties. Calculations of the ferro-ionic coupling influence on the dielectric properties, domain structure morphology, and phase states are performed within the framework of the Ginzburg–Landau–Devonshire–Stephenson–Highland approach. Theoretical results explain the main trends of experimentally observed temperature dependences of the effective dielectric permittivity, which allows us to understand the correlations between the temperature behavior of dielectric properties, domain structure morphology, and phase state of Bi_1–xSm_xFeO₃ nanoparticles.

Keywords: multiferroics, ferro-ionic coupling, dielectric properties, domain structure morphology, phase state.