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A series of Ca3Co4−xMnxO9+δ (x=0, 0.25 and 0.5) samples were prepared under two-step external magnetic field during both processes of sol–gel and pre-pressing. The effects of Mn doping and external magnetic field on the microstructure and electrical transport properties of the samples have been studied systematically. The investigated results show that Mn-doping can improve the electrical transport...
Ca3−xLaxCo4O9+δ (x=0, 0.05, 0.10, 0.15 and 0.25) ceramic samples were prepared under two-step external magnetic field during both processes of sol–gel and pre-press, and the influence of La doping and external magnetic field on their microstructure and electrical transport properties has been investigated systematically. Due to La-doping, both the Seebeck coefficient (S) and resistivity (ρ) were increased...
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