Abstract
Double perovskite La2CoMnO6 (abbreviated as LCMO) ceramics with compact structure and excellent properties were synthesized by plasma-activated-sintering followed by post-annealing. The effect of post-annealing on microstructure as well as electrical and magnetic properties was investigated. The LCMO ceramics were found to be single-phased with a tightly-bonded structure in the monoclinic space group (P21/n), and Co3+ and Mn3+ were converted into Co2+ and Mn4+ after post-annealing. As a result, the magnetic performance of the post-annealed LCMO ceramics was enhanced remarkably, although the annealing process had little effect on electrical properties due to the variable-range-hopping mechanism. The post-annealed plasma activated sintered LCMO ceramics exhibited a single magnetic transition point at 225.1 K, whose saturation magnetization and coercivity were 46.85 emu/g and 7.96 kOe, respectively.
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