Abstract
LaMnO3 oxide was successfully synthesized from La(OH)3 and Mn2O3 precursors (molar ratio La/Mn=0.6) using the spark plasma sintering technique (SPS). The in-situ reaction proceeds in a few minutes at 900°C under 50MPa with the very high heating rate of 100°C/min. LaMnO3 powder was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and magnetic measurements. The Rietveld refinement of the X-ray powder diffraction shows that LaMnO3 sample crystallizes in a perovskite structure O′-type orthorhombic symmetry with Pbnm space group. Our sample undergoes an A-type antiferromagnetic order with Néel temperature equal to 138K. The magnetic susceptibility shows the Curie–Weiss behavior between 170 and 320K with the effective magnetic moment μeff=4.78μB/f.u and the Curie constant θP=−20K (antiferromagentic sign).
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