Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 16, Pages 20855-20859Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.07.073
Keywords
La2CoMnO6 ceramics; Plasma-activated-sintering; Post-annealing; Electrical and magnetic properties
Categories
Funding
- National Key Research and Development Program of China [2017YFB0310400]
- National Natural Science Foundation of China [51272195, 51521001, 51804239]
- 111 Project [B13035]
- Fundamental Research Funds for the Central Universities [WUT: 2019111029]
- State Key Laboratory of Powder Metallurgy at Central South University in China [621011810]
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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 (P2(1)/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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