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A single-phase polycrystalline La0.5Ba0.5CoO3-d sample was synthesized bymicrowave irradiation within 20 minutes of processing time and its structural,magnetic, electrical, and magnetostrictive properties were investigated. Whilethe temperature dependence of field-cooled magnetization (M) in a field of H =0.5 kOe indicates the onset of ferromagnetic transition at TC = 177 K,irreversibility between the zero field-cooled and field cooled M(T) persistseven at H = 3 kOe. M(H) at 10 K does not saturate at the maximum availablefield and has a much smaller value (0.87 {\mu}B/Co in a field of 50 kOe) than1.9 {\mu}B/Co expected for spin-only contribution from intermediate Co3+ andCo4+ spins. The resistivity shows insulating behavior down to 10 K and only asmall magnetoresistance (~ 2% for H = 70 kOe) occurs around TC. All theseresults suggest a magnetically heterogeneous ground state with weaklyinteracting ferromagnetic clusters coexisting with a non-ferromagnetic phase.The length of the sample expands in the direction of the applied magnetic field(positive magnetostriction) and does not show saturation even at 50 kOe. Themagnetostriction has a maximum value (= 252 ppm) at 10 K and it decreases withincreasing temperature. The smaller value of magnetostriction compared to theavailable data on La0.5Sr0.5CoO3 suggests that non-ferromagnetic matrix is mostlikely antiferromagnetic and it restrains the field-induced expansion offerromagnetic clusters in the microwave synthesized La0.5Ba0.5CoO3-d sample.

Magnetostriction in microwave synthesized La0.5Ba0.5CoO3