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Abstract
The present thesis contains along with the aim of the work the following four chapters.
Chapter (1), represents an introduction dealing with two main topics:-
(i) General introduction to ferriles.
(ii) A review oflilerature which includes some useful summaries of research work previously done by others and which are related and /or useful to interpret and justify our experimental work.
Chapter (2), gives basic theoretical considerations necessary to be reviewed before going further to the main experimental work; such as: classification of magnetic materials, crystal structure of ferriles: spinel, garnet, orthoferrite and hexagonal ferrites, cation distribution in ferrites, magnetic interactions, magnetic anisotropy, magnetic permeability, selectivity of a specific frequency band, conduction mechanisms in ferrites, thermoelectric power, polarization mechanism, dielectric constant, dielectrics in alternating fields and dielectric conductivity.
Chapter (3), represents the experimental techniques used tn the present work, starting with the preparation of the samples and analyzing these samples using both the X-ray diffraction method and IR spectroscopy. After that, the other experimental circuits and methods performed were explained.
Chapter (4), shows the obtained results displayed in figures and listed in tables. The discussion of these results is also given. Prom that discussion the following conclusions could be altained:-
1 - The X-ray diffraction analysis of the samples ensures the formation of Y-type hexagonal ferrite without noticeable residuals of the original constituent oxides.
2- The lattice parameters a and c for all samples are in satisfactory.agreement with the literature.