Structural and Thermoelectric Properties of Rare-Earth-Substituted Sr₃Fe₂O₇

Structural and Thermoelectric Properties of Rare-Earth-Substituted Sr3Fe2O7

The structural and thermoelectric properties of rare-earth (Sm)-substituted Ruddlesden­Popper-type Sr3Fe2O7, Sr31xSmxFe2O7 (SSFO, x = 0, 0.1, 0.15), were investigated by measuring the temperature dependence of its crystallographic parameters, electrical conductivity, and Seebeck coefficient (S). A sharp increase in electrical conductivity (·) up to 60 S/cm (log · = 1.78 S/cm) at 400­500°C occur...

Thermoelectric properties of perovskite - type rare earth cobalt oxide solid solutions

High-temperature resistivity and thermoelectric properties of coupled substituted Ca3Co2O6.

Polycrystalline samples of Ca3-x Na x Co2-x Mn x O6 (x=0.0-0.5) have been prepared by the sol-gel cum combustion method using sucrose in order to investigate the effects of the coupled substitution of Na and Mn on Ca and Co sites on the transport properties of Ca3Co2O6(Co326). The products were characterized by Fourier transform infrared spectroscopy, powder x-ray diffraction (XRD), thermogravi...

Grain Refinement and Enhancement of Mechanical Properties of Hot Extruded Rare-Earth Containing Magnesium Alloy

The effects of rare earth addition and hot extrusion process on the grain refinement of magnesium alloy were studied. The as-cast Mg-6Al-1Zn (AZ61) alloy had the average grain size of ~ 64 µm and its microstructure consisted of α-Mg and Mg17Al12 phase. By partial substitution of Al with Gd to reach Mg-4.8Gd-1.2Al-1Zn alloy, it was observed that the Mg17Al12 phase disappeared and two new interme...

some properties of fuzzy hilbert spaces and norm of operators

in this thesis, at first we investigate the bounded inverse theorem on fuzzy normed linear spaces and study the set of all compact operators on these spaces. then we introduce the notions of fuzzy boundedness and investigate a new norm operators and the relationship between continuity and boundedness. and, we show that the space of all fuzzy bounded operators is complete. finally, we define...