الفهرس 
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Abstract
In this thesis a different experimental study of adding Al2O3
to the prepared La0.7Ba0.3MnO3 via solid state reaction method to
acquire (La0.7Ba0.3MnO3)1-x/(Al2O3)x composites, where x=0.00,
0.025, 0.050, 0.075, 0.10, 0.125 & 0.150 wt %. The physical
properties especially: structural, magneto-transport, thermoelectric
power and magnetic properties as a function of composition and
annealing temperature were studied. On other side, the annealing
temperature was taken as a variable parameter to study its influence
on before mentioned physical properties of the considered
composites. An analysis of the structural properties was carried out
by means of X-ray diffraction, the Rietveld technique and Scanning
Electron Microscope (SEM). The doping process did not change the
structural properties. The structural properties are characterized by a
single-phase rhombohedral structure with a space group ( ̅ ). The
crystallite sizes (determined from XRD) are smaller than the
grain sizes (determined from SEM). This difference is probably
due to the fact that an LBMO grain consists of severa