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- W2322843411 abstract "Thermoelectric properties of the Ca3Co4O9 system have been enhanced through an exotic route: Na doping at Co site, namely misplaced substitution. To compare, we have also performed the research of Na doping at Ca site and Co vacancy. In view of the analysis of XRD, XPS, and Raman data, Na+ ions could be suggested to enter into Co sites of [CoO2] layers in Ca3Co4–xNaxO9 (x = 0, 0.05, 0.10) and Ca sites of [Ca2CoO3] layers in Ca2.90Na0.10Co4O9, respectively. And Co ions are omitted from [CoO2] layers in Ca3Co3.90O9. Among all samples, Ca3Co3.90Na0.10O9 shows the maximum ZT value, which at room temperature reaches to ∼0.0117. Such a value is about 150% larger than that of Ca3Co4O9 and 63% larger than that of Ca2.90Na0.10Co4O9. The results indicate that the misplaced substitution is more beneficial to enhance the thermoelectric performance of Ca3Co4O9 system, compared with the traditional idea with Na doping at Ca site. Such an enhancement is mainly attributed to the combined action of electronic correlation, locally modified band structure near Fermi level, and carrier concentration." @default.
- W2322843411 created "2016-06-24" @default.
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- W2322843411 date "2015-04-06" @default.
- W2322843411 modified "2023-10-11" @default.
- W2322843411 title "Enhanced Thermoelectric Performance Induced by Misplaced Substitution in Layered Ca<sub>3</sub>Co<sub>4</sub>O<sub>9</sub>" @default.
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- W2322843411 doi "https://doi.org/10.1021/jp512012d" @default.
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