Abstract:Ca 2.93 Na 0.07 Co 4 O y /x wt% K 2 CO 3 (x=0.00, 0.01, and 0.03) polycrystalline ceramics were prepared by conventional solid-state method. XRD results have shown that all samples predominantly include Ca 3 Co 4 O 9 phase together with small amounts of secondary phases. SEM images show that all samples have randomly oriented plate-like grains in different sizes. The electrical resistivity measurement showed that electrical properties of Ca 3 Co 4 O 9 ceramics can be improved significantly by both, Na doping a… Show more
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