Abstract—

Low-porosity layered calcium cobaltite-based ceramics with copper additions have been prepared by hot pressing and their microstructure and electrical transport and thermoelectric properties have been studied. The results demonstrate that the addition of copper particles to the ceramics reduces the average particle size of the Ca₃Co₄O_{9 + δ} phase and the thermoelectric power and porosity of the samples and increases the electrical conductivity and thermoelectric power factor (P) of the ceramics. The highest thermoelectric power factor is offered by the hot-pressed ceramic with the composition Ca₃Co₄O_{9 + δ} + 2 wt % Cu (P₁₁₀₀ = 521 μW/(m K²)), which is a factor of 1.4 higher than that of the basic material Ca₃Co₄O_{9 + δ} having the same thermal history (P₁₁₀₀ = 363 μW/(m K²)) and more than five times the thermoelectric power factor of low-density Ca₃Co₄O_{9 + δ} ceramics prepared by conventional solid-state reactions.

中文翻译：

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铜添加对热压法制备层状钴酸钙热电性能的影响

摘要-

通过热压制备了具有铜添加物的低孔隙度层状钴酸钙基陶瓷，并研究了它们的微观结构，电传输和热电性能。结果表明，向陶瓷中添加铜颗粒降低了Ca ₃ Co ₄ O _{9 +δ}相的平均粒径，降低了样品的热电功率和孔隙率，并提高了陶瓷的电导率和热电功率因数（P）。陶瓷。组成为Ca ₃ Co ₄ O _{9 +δ} + 2 wt％Cu（P _1100）的热压陶瓷可提供最高的热电功率因数＝521μW/（m K ²）），这是比具有相同热历史的基础材料Ca ₃ Co ₄ O _{9 +δ}（P ₁₁₀₀＝363μW/（m K ²））高1.4倍。是传统固态反应制备的低密度Ca ₃ Co ₄ O _{9 +δ}陶瓷热电功率因数的五倍以上。