Electrical conductivity and extended X-ray absorption fine structure studies of SrFe1−xNbxO3 and BaFe1−xNbxO3 systems

Enhanced CO2 Resistance for Robust Oxygen Separation Through Tantalum‐doped Perovskite Membranes

“…Incorporating more Ta beyond 5 mol %, as is the case of SFT0.1 and SFT0.2 membranes, lowered the J (e.g., maximum J of only 0.59 mL min −1 cm −2 and 0.38 mL min −1 cm −2 , respectively, were achieved at 950 °C). This is consistent with the reduced δ and the higher metal–oxygen bond strength (given the higher Ta−O bond strength relative to Fe−O) for compounds with higher Ta content (Table ), which may lower the oxygen ionic conductivity . It is well‐known that the O 2 permeability is strongly influenced by the concentration of oxygen vacancies and the mobility of oxygen ions .…”

Electrical properties and ethanol-sensing characteristics of perovskite La1−xPbxFeO3

“…x = 0.31) increased from −51.22% at 40 • C to a negative maximum value −82.87% at 100 • C, but fell off to zero at about 165 • C. In contrast, in the temperature range from 165 to 360 • C, the response increased from zero to the maximum value 44.13% at 280 • C, and deteriorated again at higher temperature. This suggests that the semiconductivity changed from p-to n-type behavior at 165 • C namely, the resistance of the sensor increased upon exposure to ethanol gas at temperatures below 165 • C, while it decreased above 165 • C. This sort of interesting phenomenon was reported with perovskite oxides of SrFe 1 − x Nb x O 3 and BaFe 1 − x Nb x O 3 when exposed to NO 2 gas [13]. In addition, transition from n-to p-type was also observed with other oxides in presence of reducing gases [16,17].…”

“…The materials are highly defective and have oxygen deficient structures, in which the valence state of metal ions may be controlled by temperature, oxygen partial pressure and dopants [13]. Actuators based on ABO 3 -type oxide materials of rare-earth elements have an excellent stability.…”

Synthesis, structural and electrical characterizations of Sr2Fe1−xMxNbO6 (M=Zn and Cu) with double perovskite structure

“…Jurado and coworkers reported that Fe-containing perovskite oxides exhibited quite high oxide ionic and electronic conductivities [16], therefore many extensive researches are focused on Fe-containing perovskite compounds. Some new families of compounds based on the double perovskite structure are known, including (Ba/Sr/Ca) 2 FeMoO 6 [1,[17][18][19], Sr 2 FeReO 6 [20][21][22], Sr 2 FeSbO 6 [23], and (Ba/Sr/Ca) 2 FeNbO 6 etc [8,[23][24][25][26][27]. T. S. Irvine group reported that Sr 2 FeNbO 6 might be candidate for SOFC anode application if a film anode could be applied [8].…”