The effect of aluminum on (La0.7Ba0.3MnO3)1-x/(Al2O3)x composites is investigated based on their crystal
structure, thermoelectric power and magnetic properties. The X-ray diffraction process reveals that the composite
still exhibits a rhombohedral perovskite structure (R3¯C) of all composites. The thermoelectric power data
satisfies the Magnon and Phonon-drag models in the low-temperature range, and the smaller Polaron conduction
mechanism in the high-temperature range. The power factor values decrease with Al content and the x=0.025
record the highest value. All composites undergo ferromagnetic to paramagnetic transition at a certain temperature
TC. The AC susceptibility values decrease with the increasing Al content.