Fabrication and thermoelectric properties of Sr1−Si MnO3−

Seo, Jang Woo; Kim, C.M.; Park, K.

doi:10.1016/j.powtec.2015.02.035

Cited by 10 publications

(1 citation statement)

References 40 publications

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“…Plausible ways to enhance the thermoelectric parameters such as electrical resistivity (ρ) and Seebeck coefficient (S), in search of increasing the values of the figure of merit in LaCoO3 is the use of an appropriate dopant (chemical pressure) in partial replacement of the Co 3+ ion; which would open a wide spectrum of potential applications in thermoelectric generators [13,14], for the use of renewable energies [15][16][17], and for the recovery of waste heat [18,19] in order to reduce energy costs as well as environmental issues. Several researchers studied the effect of La 3+ ion substitution [20] on the magnetic and thermoelectric properties of LaCoO3 [21][22][23]. The substitution of La 3+ by divalent ion in LaCoO3, such as Ca 2+ , Sr 2+ , Ba 2+ has a significant influence on the spin state of Co 3+ /Co 4+ , oxygen vacancy concentration and/or crystal-structure distortions in the materials, which also affect the physical, i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni-Doping on Seebeck Coefficient of LaCoO<sub>3</sub> System

Echavarría,

Zapata,

Muñoz

et al. 2024

KEM

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The aim of this study is discussing the results achieved on undoped and Ni-doped bulk LaCoO3 samples synthesized by solid-state reaction. The crystal structures of the samples were analyzed by x – ray diffraction (XRD) and Rietveld refinement of the XRD patterns was used to test the quality of the samples, the results of this procedure confirmed a single phase of LaCo1-xNixO3 for (x=0 and 0.05) with rhombohedral crystal structure (space group :). The main interest in this class of materials is the possibility of improving the values of Seebeck coefficient and electrical resistivity through chemical doping. The Seebeck coefficient and electrical resistivity were investigated from room temperature (RT) to 450 K, near RT the LaCoO3 system showed a large negative Seebeck coefficient, but it changed to positive value with increasing temperature while the LaCo0.95Ni0.05O3 composition showed a positive Seebeck coefficient throughout all the temperature range. Hence, within this study the Ni substitution led to decrease the electrical resistivity of the samples to one order of magnitude as a result of the partial substitution of Co3+ in LaCoO3 by Ni2+. LaCoO3 was chosen for this thermoelectric test because cobalt oxides have extensive applications.

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