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• W2564430070 abstract "Nearly dense polycrystalline samples of Ca1-xGdxMn1-xWxO3-δ with Gd/W double substitution (0 ≤ x ≤ 0.03) were prepared by the mixed-oxide route and their thermoelectric properties were evaluated in the temperature range 25 °C–700 °C. All samples are single-phase with an orthorhombic perovskite structure. At higher temperatures the samples are nonstoichiometric, and a phase transition from orthorhombic to cubic occurs with the transition temperature systematically increasing with x. Double substitution with Gd and W leads to increased electrical conductivity and reduced thermopower, resulting in a maximum of the power factor of 370 μW/(K2m) for the composition x = 0.01 at 300 °C. Charge transport in the samples is discussed as polaron hopping type transport. The values of the Seebeck coefficient are interpreted with Heikes formula and imply a small nonstoichiometry of the samples. The thermal conductivity is decreased with increasing x, and for x = 0.03 a κ = 3.2 W/mK is observed at 100 °C. Double substituted calcium manganite with x = 0.01 exhibits a figure of merit ZT = 0.12 at 700 °C." @default.
• W2564430070 created "2017-01-06" @default.
• W2564430070 creator A5055923165 @default.
• W2564430070 creator A5059888523 @default.
• W2564430070 date "2017-03-01" @default.
• W2564430070 modified "2023-09-30" @default.
• W2564430070 title "Thermoelectric properties of Gd/W double substituted calcium manganite" @default.
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• W2564430070 doi "https://doi.org/10.1016/j.jallcom.2016.12.359" @default.
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