Open AccessФазовые превращения в оксидах железа под действием микроволнового излучения
Author(s) -
О.Н. Каныгина,
В.Л. Бердинский,
М.М. Филяк,
А.Г. Четверикова,
В.Н. Макаров,
М.В. Овечкин
Publication year - 2020
Publication title -
žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-748X
pISSN - 0044-4642
DOI - 10.21883/jtf.2020.08.49541.308-19
Subject(s) - maghemite , hematite , ferrimagnetism , materials science , magnetite , iron oxide , antiferromagnetism , oxide , ferromagnetism , scattering , microwave , phase (matter) , analytical chemistry (journal) , chemical engineering , magnetic field , condensed matter physics , chemistry , metallurgy , optics , magnetization , physics , organic chemistry , engineering , quantum mechanics , chromatography
It is shown that microwave radiation induces structure changes and, consequently, magnetic phase transitions in iron oxide alpha-Fe2O3. We subjected finely dispersed partially amorphized particles of iron oxide Fe2O3 to 10-minute-long microwave field treatment in a humid air environment. This resulted in a reduction of the hematite crystalline phase by 40%. At the same time the total fraction of crystalline components increased due to the creation of a new ferromagnetic modification which is maghemite alpha-Fe2O3. The original antiferromagnetic samples and the finial ferrimagnetic batches were powders composed of spherical particles with similar values of the area of a coherent X-ray scattering area (40-60 nm).