Synthesis and spectroscopic investigations of Mn_3O_4 nanoparticles

摘要

Trimanganese tetraoxide (Mn_3O_4) nanoparticles have been synthesized via hydrothermal process. Nevertheless, homogeneous nanoparticles of Mn_3O_4 with platelet lozange shape were obtained. The crystallite size ranged from 40 to 70 nm. The Mn_3O_4 product was investigated by X-ray diffraction, transmission electron microscopy (MET), and impedance spectroscopy. Electrical conductivity measurements showed that the as-synthesized Mn_3O_4 nanomaterial has a conductivity value which goes from 1.810~(-7) Ω~(-1) cm~(-1) at 298 K, to 2310~(-5) Ω~(-1) cm~(-1) at 493 K. The temperature dependence of the conductivity between 298 and 493 K obeys to Arrhenius law with an activation energy of 0.48 eV.