Influence of processing conditions on the thermoelectric properties of La1-xSrxCoO3 (x=0, 0.05)

Abstract

Pressure dependency of thermal boundary conductance of carbon nanotube/silicon interface: A molecular dynamics study J. Appl. Phys. 112, 053501 (2012) Investigation of thermal properties of mid-infrared AlGaAs/GaAs quantum cascade lasers J. Appl. Phys. 112, 043112 (2012) Opposite ReD-dependencies of nanofluid (Al2O3) thermal conductivities between heating and cooling modes Appl. Phys. Lett. 101, 083111 (2012) Thermal transport in graphene supported on copper J. Appl. Phys. 112, 043502 (2012) Thermal conductivity of self-assembled nano-structured ZnO bulk ceramics Abstract. La 1-x Sr x CoO 3 (x=0, 0.05) powders were prepared using the citrate-gel (Pechini) process. Pellets formed from these powders were sintered at various temperatures. All samples were characterized by means of X-Ray Diffraction and Scanning Electron Microscopy in order to investigate their structural and morphological properties. The electrical resistivity, thermal conductivity and thermopower were measured in a wide range of temperatures (2-350K) in order to understand the influence of the different processing conditions on the thermoelectric properties of the compounds.

Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSr x CoO3±δ (0 ≤ x ≤ 1)

“…Otherwise, for values of x > 0.15, we notice very low values of S, which indicates the metallic conductivity of samples. These S behaviors for La 1-x Sr x CoO 3 samples were also observed in several previous studies [36][37][38]54,56].…”

“…Polycrystalline La 0.95 Sr 0.05 CoO 3 was first reported to have a high ZT value of 0.18 and S = 710 μV/K at room temperature [20], whereas more recent studies have found significantly lower thermopower values for this composition at the same temperature. For instance, Zhang et al [36], Kozuka et al [37], and Papageorgiou et al [38] have reported that S is about 250 μV/K. However, high ZT value of 0.19 has still been reported with S = 213 μV/K for La 0.9 Sr 0.1 CoO 3 nanowires [22].…”

Effect of Preparation Method and Calcination Temperature on LaCoO3 Perovskite Catalyst for Diesel Soot Oxidation

“…It is clear from the table that on increasing the temperature the crystallite size increased irrespective of the preparation method. Other researchers also reported the similar effect of temperature on crystallite size [36,37].It is noteworthy that the catalyst (A- as compared to catalysts prepared by other methods and calcined at same temperature. …”

“…The unusual presence of La(OH) 3 can be explained by hydroxylation of the surface which becomes more pronounced at higher temperatures. The crystallite size (table 3) and intensity of diffraction peaks are, as expected, observed to increase with increasing calcination temperature, because crystallinity are well defined at higher temperatures [36,37]. Figure 4 depicts the infrared absorption spectra of the LaCoO 3 catalyst prepared by co-precipitation method and calcined at 750 o C.The broad absorption bands around 3054 cm -1 and 2345 cm -1 appeared in the IR spectra of the as-prepared LaCoO 3 (A-750) corresponded to OH stretching and OH bending of water.…”

Ba substitution for enhancement of the thermoelectric properties of LaCoO3 ceramics (0⩽x⩽0.75)

“…Indeed, on the contrary to all the other cobalt oxides that present high thermoelectric properties at high temperatures, Androulakis et al [19] have reported in La 1-x Sr x CoO 3 (x = 0.05), the highest thermoelectric properties for an oxide at 300 K (ZT = 0.18). Therefore, Sr substituted LaCoO 3 ceramics have been largely studied [20][21][22][23] and the optimum value for thermoelectric properties is obtained for x = 0.05. Moreover, Bousnina et al [23] have shown that the substitution can be realized up to x = 0.8 without any addition and up to x = 1 for an additional substitution of 3% Si for Co.…”