High-temperature thermoelectric properties of late rare earth-doped Ca3Co4O9+δ

Nong, Ngo Van; Liu, Chia‐Jyi; Ohtaki, Michitaka

doi:10.1016/j.jallcom.2010.09.150

Cited by 102 publications

(64 citation statements)

References 29 publications

(41 reference statements)

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“…However, the previous studies did not show any consistency of the S dependence and different methods were used to interpret different results. The first way is to use the model based on the modified Heikes formula [17,18,20,22,26,41] S ¼ À j B e ln g 3 g 4 …”

Section: Resultsmentioning

confidence: 99%

“…The substitution can take place either at the Ca-site or at the Co-site. There have been a number of reports on partially substituted elements at Ca-site, for instance, Na [11][12][13][14], Y [8], Ag [15][16][17][18], Bi [12,19], Ba [18], Nd [14], Gd [20], Yb [21], and other rare earth elements [22][23][24]. The effect of partial substitution at the Ca-site is mainly to change the charge carrier concentration which results in a change in resistivity.…”

Section: Introductionmentioning

confidence: 99%

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Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+δ (M = Co, Cr, Fe, Ni, Cu and Zn)

Pinitsoontorn

Lerssongkram

Keawprak

et al. 2011

J Mater Sci: Mater Electron

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The thermoelectric properties of the Ca 3 Co 4 O 9?d and the transition metals-doped Ca 3 Co 3.8 M 0.2 O 9?d (where M = Cr, Fe, Ni, Cu and Zn) ceramics were reported. Ca 3 Co 4 O 9?d single phase was checked by using X-ray diffraction analysis performed for the Ca 3 Co 3.8-M 0.2 O 9?d samples. The scanning electron micrographs showed some degrees of grains alignment in the compacted direction. The resistivity of the samples measured from 100 up to 700°C varies in magnitude for different transition metals substitution. The variation of resistivity was explained by a change of carrier concentration induced by the doped ions. The thermopower increased with increasing temperature but showed no obvious change for any transition metals doping. The thermal conductivities changed for the doped samples but were relatively independent of temperature. The ZT was calculated to be the highest for the Fe substitution for the whole measurement temperature with the maximum value of 0.12 at 700°C.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+δ (M = Co, Cr, Fe, Ni, Cu and Zn)

Pinitsoontorn

Lerssongkram

Keawprak

et al. 2011

J Mater Sci: Mater Electron

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“…The introduction of lanthanide elements, including neodymium (Nd) [152], europium (Eu) [149], holmium (Ho), dysprosium (Dy), erbium (Er) [153], ytterbium (Y) [131] and lutetium (Lu) [153], increases [134,135]. Addition of gadolinium (Gd), dysprosium (Dy), holmium (Ho), and ytterbium (Y) is able to decrease thermal conductivity.…”

Section: P-type Thermoelectric Oxidesmentioning

confidence: 99%

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Kong

Hng

et al. 2014

Waste Energy Harvesting

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Waste thermal energy (heat) is the second type of energy to be discussed. Usually, it is generated in a process by way of fuel combustion or chemical reaction, and then ''dumped'' into the environment even though it could still be reused for some useful and economic purpose. The essential quality of heat is not the amount but rather its ''value.'' The strategy of how to recover this heat depends in part on the temperature of the waste heat gases and the economics involved.Waste thermal energy is one of the largest sources of inexpensive, clean, and fuel-free energy available. The vast amount of heat that is discharged into the atmosphere everyday is one of the best sources of clean, fuel-free, and inexpensive energy. According to the US Department of Energy (DOE), up to 50 % of all fuels burned in the US goes unused into the atmosphere as waste heat is released to the atmosphere. Research indicates that the energy currently wasted by the industrial facilities in the U.S. could produce as much as 20 % of the total US electrical output with the associated 20 % reduction in greenhouse gas emissions. Various sources that can be classified as waste thermal energy (heat) with their properties are listed in Tables 4.1 , 4.2, 4.3, and 4.4 [1].Among the large quantities of waste heat that have been directly discharged into the Earth's environment, much of it is at temperatures which are too low to recover by using the conventional electrical power generators. Thermoelectric power generation, also known as thermoelectricity, has been demonstrated as a promising technology in the direct conversion of low-grade thermal energy, such as waste heat energy into electrical power. Probably, the earliest application is the utilization of waste heat from a kerosene lamp to provide thermoelectric energy to power a wireless device. Thermoelectric generators have also been used to provide small amounts electricity to remote regions, for instance, Northern Sweden, as an L. B. Kong et al., Waste Energy Harvesting, Lecture Notes in Energy 24,

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“…[7][8][9][10][11][12][13][14][15][16] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 The phase purity of the powders and the deposited layers on dense CGO substrate was checked by the X-ray diffraction (XRD) on a BrukerD8 diffractometer with Cu K  radiation. The microstructures of the sintered thick-films were analyzed using a Zeiss Supra 35 scanning electron microscope (SEM) system.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Thermoelectric Properties of Screen-Printed Thick Films of Misfit-Layered Cobalt Oxides with Ag Addition

Nong

Samson

Pryds

et al. 2011

Journal of Elec Materi

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Thermoelectric properties of thick-films (60 m), which were prepared by a screen printing technique using p-type misfit-layered cobalt oxide Ca 3 Co 4 O 9+ with Ag addition, have been studied. The screen-printed films were sintered in air at various temperatures ranging from 973 K to 1223 K. After each sintering process, crystal and microstructure analyses were carried out in order to determine an optimal sintering condition. The results show that thermoelectric properties of pure Ca 3 Co 4 O 9+ thick-film are comparable with cold-isostatic-pressed (CIP) samples. We found that the maximum power factor was improved about 67% (0.3 mW/mK 2 ) for a film with proper silver (Ag) metallic inclusions as compared to 0.18 mW/mK 2 for the film of pure Ca 3 Co 4 O 9+ under the same sintering condition at 1223 K for 2 h in air.

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High-temperature thermoelectric properties of late rare earth-doped Ca3Co4O9+δ

Cited by 102 publications

References 29 publications

Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+δ (M = Co, Cr, Fe, Ni, Cu and Zn)

Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+δ (M = Co, Cr, Fe, Ni, Cu and Zn)

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Microstructure and Thermoelectric Properties of Screen-Printed Thick Films of Misfit-Layered Cobalt Oxides with Ag Addition

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