Thermoelectric properties of the SmCoO3 and NdCoO3 cobalt oxides

Abstract

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.

A. K. Saran on Modernity, Indian Tradition and Sociology in India

“…In recent years, fascinating structural transitions, transport properties, and large α of LnCoO 3 [7][8][9][10][11][12][13][14][15][16][17][18][19] series have attracted the scientists. Furthermore, these compounds have gained attention due to high temperature oxidation resistance and simple synthesis technique.…”

Electrochemical and magnetic properties of electrospun SmFeO3 and SmCoO3 nanofibers

“…Samarium cobalt oxide (SmCoO 3 ) possesses outstanding electrocatalytic property, excellent chemical stability, and high electrical conductivity 7,14 . Similar to SmFeO 3 , SmCoO 3 has distorted orthorhombic structure and tilted CoO 6 octahedron 3,15 . He et al.…”

“…7,14 Similar to SmFeO 3 , SmCoO 3 has distorted orthorhombic structure and tilted CoO 6 octahedron. 3,15 He et al demonstrated the 3D ordered microporous SmCoO 3 for electrochemical H 2 O 2 detection performance, and it was reported that the electrooxidation mechanism was ascribed to Co 3+ /Co 4+ redox reactions. 7 Shimada et al studied the electrochemical properties of Sr-doped SmCoO 3 as cathode materials for highperformance solid oxide fuel cells.…”

DFT ‐based insight into the magnetic and thermoelectric characteristics of XTaO 3 (X = Rb, Fr) ternary perovskite oxides for optoelectronic applications

“…Not only, the perovskite oxides, but also fluoroperovskite crystal structures like LiBeF 3 and so on could be used for fabricating optoelectronic devices 17,18 . Among the oxides, thermoelectric behavior of SmCoO 3 and NdCoO 3 has very recently been probed, wherein, Seebeck coefficient of NdCoO 3 was ascribed atypical, while, SmCoO 3 has shown a range of positive values 19 . In 2020, LaYO 3 (Y = Cr and Mn) were reported as good thermoelectric materials which are equally good for optoelectronic devices 20 …”

“…17,18 Among the oxides, thermoelectric behavior of SmCoO 3 and NdCoO 3 has very recently been probed, wherein, Seebeck coefficient of NdCoO 3 was ascribed atypical, while, SmCoO 3 has shown a range of positive values. 19 In 2020, LaYO 3 (Y = Cr and Mn) were reported as good thermoelectric materials which are equally good for optoelectronic devices. 20 As per our knowledge, heretofore, combinations of the ternary perovskite oxides such as RbTaO 3 and FrTaO 3 have not been rendered much attention of the researchers for their viability to be considered in the thermoelectric and other allied devices.…”