Abstract
La0.5Sr0.5CoO3−δ (abbreviated as LSCO) foams with broad range of porosities (76.9 to 90.3%) having near spherical cells were prepared through emulsion freeze gelcasting route. The LSCO foam bodies had compressive strength and Young’s modulus in ranges of 1–7MPa and 57 to 428MPa, respectively. The increase in resistance of the foams with temperature shows their metallic conducting nature. Out of the three studied samples, the trend in the room temperature conductance follows the order in which their EMI shielding values vary. Compared to the dense LSCO, the electrical conductivity values are inferior in foams, by an order. Impressive electromagnetic interference shielding effectiveness as high as 33dB has been achieved for LSCO foams prepared at a porosity level of 80% with 10vol.% LSCO in the composition. The developed LSCO foams are lightweight and capable of withstanding harsh environmental conditions, since they are free from oxidation and survivable at high temperature.
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