Additive's Structural and Magnetic Effect on the Solid State Reaction in Fe-Co Powders
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Date
2023-12-07
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Hanane Berkani
Abstract
The main goal of this thesis is to understand the influence of the average crystallite size as a
function of the milling time on the structural, microstructural, mechanical, magnetic properties and
also the growth of bacteria strains. This study is devoted to the elaboration of nanostructured
Fe
15
Co
2
P
3
powder mixtures by mechanical alloying process which allows the formation of alloys with a
grain size in the nanometer range, then the physicochemical characterization of the powder mixtures
and also the effect of Fe
15
Co
2
P
3
powder mixtures on the growth of test bacteria. A high energy
planetary ball-mill Retsch PM 400 was chosen for synthesis the powder mixtures. Phases formation,
microstructural, structural, mechanical magnetic and growth of bacteria strains of the ball milled
powders were studied as a function of milling time, t (t = 0h, 1h, 2h and 3h) by X-ray diffraction using
the MAUD program which is based on the Rietveld method, vibrating sample magnetometer, and
Fourier-transform infrared spectroscopy and ultraviolet–visible spectroscopy. The XRD results
revealed the coexistence of the centered cubic α-Fe(P) solid solution and Co
binary phase, for all
milled samples. The average crystallite size <L> of the formed solid solution and binary phase
decreased with the milling time. The evolution of the mechanical properties "Young's Modulus and
Poisson's Coefficient" demonstrated the stiffness and the deformation properties of the formed phase
and solid solution. The milling process induced some important changes in the magnetic properties,
whereas the variation of the saturation magnetization and coercivity was associated mainly with the
particle size refinement, accumulation of microstrain and formation of solid solution α-Fe(P) and
phase. Several fundamental magnetic parameters have been discussed as a function of milling
time. The current study provides evidence that milled Fe
powder mixtures with different
concentrations have better antibacterial activity against Gram-positive strains and the same powder
mixtures could be used as cofactor for the examined Gram-negative strains.