The effect of external physical factors on the formation and properties of synthetic magnetic materials

Abstract

Purpose. Investigation of the effect of external physical factors on the formation of the structure and
properties of synthetic magnetic materials for processing textiles of different raw materials.
Methodology. The structural characteristics were studied by X-ray diffraction (XRD). The saturation
magnetization (Ms) of the created synthetic magnetic samples was investigated using the magnetometry
method. To determine the absolute value of the magnetic moment (magnetization) of these samples,
calibration was performed using a reference sample with a known saturation magnetization.
Results. The values of the saturation magnetization of synthetic nanomagnetite samples when
changing the conditions of their synthesis range from 23±1 A·m²/kg to 41±1 A·m²/kg, the average
size of magnetite crystallites varies from 6.3±0.1 nm to 10.5±0.1 nm, which confirms the obtaining of
nanosized magnetite samples in pure form. The regularity of the influence of synthesis conditions on
the size of magnetite nanocrystallites, its structure and properties depending on the action of various
external factors has been established. For samples synthesized under ultrasonic treatment conditions
without a magnetic field, the saturation magnetization values are, on average, higher than for samples
synthesized under ultrasonic treatment conditions and a magnetic field.
Scientific novelty. For the first time, the effect of external physical factors (ultrasonic treatment,
application of a magnetic field during the formation of nanomagnetite) was studied and the patterns
of their influence on the magnetic and structural characteristics of synthetic magnetic materials were
established.
Practical value. The study of the influence of ultrasonic treatment and the application of a magnetic
field on the formation of synthetic analogues of biogenic magnetite is of great importance for the further
synthesis of magnetite and the regulation of its properties when processing textile materials of various
raw materials. The practical potential of the processed samples lies in the ability to shield microwave
energy, the ability to which is provided by the controlled synthesis of magnetite nanoparticles under
the action of various external factors.