Characterization of atmospheric plasma-sprayed La0.8Sr0.2Ga0.8Mg0.2O3 electrolyte

Atmospheric plasma-sprayed La0.8Sr0.2Ga0.8Mg0.2O3 electrolyte membranes for intermediate-temperature solid oxide fuel cells

“…33 However, Hwang et al reported that the plasma-sprayed LSGM deposit showed a conductivity of $0.054 S cm À1 at 800 C, 32 only $50% of the value for a sintered bulk sample. 9 In our previous study, the plasma-sprayed dense LSGM deposit exhibited a conductivity of only $0.008 S cm À1 at 800 C. 34 It was noticed that, in these investigations, all LSGMs were deposited with LSGM feedstock powders of a nominal perovskite crystalline structure and comparable compositions, and all LSGM deposits showed a dense microstructure with little difference in appearance. However, the ionic conductivity of the LSGM deposits varied in a wide range (about one order of magnitude).…”

“…The formation of an amorphous phase can be attributed to the rapid solidication process inherent to the thermal spray process, as observed in other investigations. [32][33][34] Moreover, the SAED patterns revealed that the Ga-decient region has a cubic perovskite structure, even though this region is poor in Ga. However, as shown in Fig.…”

“…Second, the assprayed deposit contained large amounts of amorphous phase identied by a broad peak with the maximum intensity at a 2q angle of $32 . Previous studies reported that the recrystallization temperature of the amorphous phase in the as-sprayed LSGM deposit was $800 C. [32][33][34] Therefore, the deposit was annealed at 800 C in air for 5 h. Aer the annealing, the LSGM deposit had a high degree of crystallization, and the broad peak of the amorphous phase disappeared. However, a small amount of a new phase, LaSrGaO 4 , was observed in the annealed deposit.…”

“…Dense LSGM electrolyte membranes were also prepared using APS. [32][33][34] The unique advantage of APS is that thin electrolyte membranes can be prepared on an electrode or metal support without high-temperature sintering. However, the ionic conductivity of the plasma-sprayed LSGM deposits showed large differences in different studies.…”

Synthesis and Application of Porous Sm0.2Ce0.8O1.9 Nanocrystal Aggregates

“…It is clear that the activation energy depends on the temperature range and there is no significant difference in the activation energy for samples sintered at 1300 and 1400 °C. For fully densified ceramics, it has been reported that the average E a for the grain boundary is higher than that for the grain interior . Therefore, the lower E a for SDC_CB than that for SDC_SR sintered at 1500 °C can be understood by the contribution from the grain boundary conductivity (σ gb ), which has a drastic increase after sintering at 1500 °C for SDC_CB samples (Figure ).…”