Methods and technique of thermopower and electrical conductivity measurements of thermoelectric materials at high temperatures

Alexander, Tyler; Andrey, I Fedotov; Kasyanov, A. A.; Ruslan, I Panteleev; Nakama, Takao

doi:10.17586/2226-1494-2015-15-2-173-195

Cited by 17 publications

(2 citation statements)

References 33 publications

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“…The low-temperature investigations were carried out on a Quantum Design Physical Property Measurement System (PPMS-9) at the Center for Collective Use, Lebedev Physical Institute, Russian Academy of Sciences (Moscow). The high-temperature measurements were performed on a thermopower and resistance measurement setup [24] at the Ioffe Institute (St. Petersburg).…”

Section: Methodsmentioning

confidence: 99%

Thermoelectric properties of the SmCoO3 and NdCoO3 cobalt oxides

Дудников

Федоров

Orlov

et al. 2020

Ceramics International

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The thermoelectric properties of the NdCoO3 and SmCoO3 rare-earth cobalt oxides with a perovskite structure have been investigated in a wide temperature range. It is shown that, in the low-temperature region, the thermal conductivity of the compounds has a sharp maximum and the electrical conductivity of the samples increases with temperature, whereas the Seebeck coefficient behaves nonmonotonically with increasing temperature. The SmCoO3 oxide is characterized by the positive thermopower over the entire investigated range with a sharp growth in the low-temperature region, attaining the maximum value (S ≈ 1000 µV/K) near room temperature, and a further decrease. It has been established that, in the NdCoO3 oxide, the Seebeck coefficient changes its sign, which was rarely observed in the La-based compounds and is atypical of the undoped rare-earth cobalt oxides. The thermopower maximum obtained at a temperature of 450 K is 400 µV/K. The regions of the fastest growth of the thermoelectric power factor correspond to the anomalies caused by the spin transition of Со 3+ ions and the dielectricmetal transition.

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Section: Methodsmentioning

confidence: 99%

Thermoelectric properties of the SmCoO3 and NdCoO3 cobalt oxides

Дудников

Федоров

Orlov

et al. 2020

Ceramics International

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“…The crystal structure was refined using the derivative difference minimization (DDM) method [10]. Temperature dependences of the thermopower and resistivity were obtained on an experimental setup developed at the Ioffe Institute, St. Petersburg [11,12].…”

Section: Methodsmentioning

confidence: 99%

Effect of Oxygen Nonstoichiometry on Electrical Conductivity and Thermopower of Gd0.2Sr0.8FeO3−δ Ferrite Samples

et al. 2018

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The behavior of the resistivity and thermopower of the Gd0.2Sr0.8FeO3−δ ferrite samples with a perovskite structure and the sample stability in an inert gas atmosphere in the temperature range of 300–800 K have been examined. It has been established that, in the investigated temperature range, the thermoelectric properties in the heating‒cooling mode are stabilized at δ ≥ 0.21. It is shown that the temperature dependencies of the resistivity obtained at different δ values obey the activation law up to the temperatures corresponding to the intense oxygen removal from a sample. The semiconductor‒semiconductor electronic transitions accompanied by a decrease in the activation energy have been observed with increasing temperature. It is demonstrated that the maximum thermoelectric power factor of 0.1 µW/(cm·K2) corresponds to a temperature of T = 800 K.

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