Effect of Gd-doping on thermoelectric properties of Ca3Co4O9+δ ceramics
Source abstract
Abstract
A series of Ca3−xGdxCo4O9+δ precursor powders were synthesized by the polyacrylamide gel method, and their ceramics were obtained by the Spark Plasma Sintering (SPS). There were lots of defects in the sheet-like grains from SEM and TEM observations. The electrical and the thermal transport properties were obviously affected by the material microstructure. The small polaron hopping conduction mechanism was determined above 600 K, and the hopping activation energy increased with the increase of doping contents. It was found that the Seebeck coefficient and the resistivity of doped samples were markly enhanced due to the impurity compensation effect, and their thermal conductivities were decreased due to the defects scattering. The maximum figure of merit of ZT = 0.24 at 973 K was obtained for Ca2.7Gd0.3Co4O9+δ.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal Radiation and Cooling Technologies · Thermal properties of materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (17)
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1. Park K, Kim KK, Seong JK (2007) Mater Lett 61:4759. doi: https://doi.org/10.1016/j.matlet.2007.03.02110.1016/j.matlet.2007.03.021 ↗
2. Zhang LH, Tosh T, Norlyuki O et al (2007) Mater Trans 48:2088. doi: https://doi.org/10.2320/matertrans.E-MRA200783610.2320/matertrans.E-MRA2007836 ↗
3. Park K, Ko KY, Seong JK et al (2007) J Eur Ceram Soc 27:3735. doi: https://doi.org/10.1016/j.jeurceramsoc.2007.02.03010.1016/j.jeurceramsoc.2007.02.030 ↗
4. Yasukawa M, Itoh S, Kono T (2005) J Alloy Compd 390:250. doi: https://doi.org/10.1016/j.jallcom.2004.07.06110.1016/j.jallcom.2004.07.061 ↗
5. Androulakis J, Hsu KF, Pcionek R (2006) Adv Mater 18:1170. doi: https://doi.org/10.1002/adma.20050277010.1002/adma.200502770 ↗
6. Terasaki I, Sasago Y, Uchinokura K (1997) Phys Rev B 56:R12685. doi: https://doi.org/10.1103/PhysRevB.56.R1268510.1103/PhysRevB.56.R12685 ↗
7. Masset AC, Michel C, Maignan A et al (2000) Phys Rev B 62:166. doi: https://doi.org/10.1103/PhysRevB.62.16610.1103/PhysRevB.62.166 ↗
8. Koshibae W, Tsutsui K, Maekawa S (2000) Phys Rev B 62:6869. doi: https://doi.org/10.1103/PhysRevB.62.686910.1103/PhysRevB.62.6869 ↗
9. Shikano M, Funahashi R (2003) Appl Phys Lett 82:1851. doi: https://doi.org/10.1063/1.156233710.1063/1.1562337 ↗
10. Creon N, Perez O, Hadermann J (2006) Chem Mater 18:5355. doi: https://doi.org/10.1021/cm061163a10.1021/cm061163a ↗
11. Prevel M, Perez O, Noudem JG (2007) Solid State Sci 9:231. doi: https://doi.org/10.1016/j.solidstatesciences.2007.01.00310.1016/j.solidstatesciences.2007.01.003 ↗
12. Matsubara I, Funahashi R, Tomonari T (2001) J Appl Phys 90:462. doi: https://doi.org/10.1063/1.137805610.1063/1.1378056 ↗
13. Asahi R, Sugiyama J, Tani T (2002) Phys Rev B 66:155103. doi: https://doi.org/10.1103/PhysRevB.66.15510310.1103/PhysRevB.66.155103 ↗
14. Wang DL, Chen LD, Wang Q et al (2004) J Alloy Compd 376:58. doi: https://doi.org/10.1016/j.jallcom.2003.12.01810.1016/j.jallcom.2003.12.018 ↗
15. Kobayashi T, Takizawa H, Endo T (1991) J Solid State Chem 92:116. doi: https://doi.org/10.1016/0022-4596(91)90248-G10.1016/0022-4596(91)90248-G ↗
16. Wang Y, Nyrissa S, Cava RJ et al (2003) Nature 423:425. doi: https://doi.org/10.1038/nature0163910.1038/nature01639 ↗
17. Takeuchi T (2004) Phys Rev B 69:125410. doi: https://doi.org/10.1103/PhysRevB.69.12541010.1103/PhysRevB.69.125410 ↗