Correlations Between the Dielectric Properties, Domain Structure Morphology and Phase State of Bi1-xSmxFeO3 Nanoparticles

TL;DR

This study investigates how the dielectric properties, domain structures, and phase states of Bi1-xSmxFeO3 nanoparticles are interrelated, combining experimental measurements with theoretical modeling to understand their temperature-dependent behaviors.

Contribution

It provides the first comprehensive analysis linking dielectric, domain, and phase properties of Bi1-xSmxFeO3 nanoparticles through combined experimental and theoretical approaches.

Findings

Temperature dependence of dielectric permittivity explained by ferro-ionic coupling.

Correlations established between dielectric behavior, domain morphology, and phase state.

Theoretical model successfully predicts experimental trends.

Abstract

Nanoscale multiferroics are basic model objects for studying polar, magnetic and magnetoelectric properties and mutual couplings. Bismuth-samarium ferrite (Bi1-xSmxFeO3) is a model orthoferrite, whose polar, magnetic and magnetoelectric properties have been studied for the bulk and thin film samples. The properties of Bi1-xSmxFeO3 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 Bi1-xSmxFeO3 nanopowders dielectric properties. Calculations of the ferro-ionic coupling influence on the dielectric properties, domain structure morphology and phase states are performed in 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 Bi1-xSmxFeO3 nanoparticles.