Open AccessМёссбауэровские исследования состава и магнитной структуры нанокомпозитов Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-/γFe-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- типа ядро--оболочка при температура 300 и 80 K (Часть I)
Author(s) -
A. S. Kamzin,
Ihab M. Obaidat,
А.А. Валлиулин,
В. Г. Семенов,
I.A. Al-Omari
Publication year - 2020
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2020.10.49928.056
Subject(s) - maghemite , magnetite , shell (structure) , materials science , nanocomposite , nanoparticle , chemical engineering , mineralogy , nanotechnology , composite material , metallurgy , chemistry , engineering
The results of Mössbauer studies of the magnetic structure and composition of Fe3O4 / γ-Fe2O3 nanoparticles at temperatures of 300 and 80 K are presented. It was found that particles Fe3O4 /γ-Fe2O3 is a core / shell nanocomposite (NC) in which magnetite (Fe3O4) is a coated by shell of maghemite (γ-Fe2O3). It was shown that the thickness of the maghemite (γ-Fe2O3) shell depends on the synthesis technology. It was found that, in the Fe3O4 /γ-Fe2O3 NC, on the surface of the maghemite (γ-Fe2O3) shell, a layer whose magnetic structure differs from the structure of the inner part of the shell (γ-Fe2O3). An intermediate layer is formed between the core and the shell in a spin-glass state. The obtained data on the structure of core / shell nanocomposites open up prospects for explaining the properties of such particles, which are of great interest for applications in various fields, including biomedicine.