Dielectric relaxation of protonic defects in hydrated and dehydrated SrZrO3:Yb

Reduction in sintering temperature of stable proton conductor BaCe0.35Zr0.5Y0.15O3-δ prepared by sol–gel method and its transport properties

“…As Zn 2+ act as dopant by replacing Ce 4+ in the perovskite lattice, the peak at higher frequency region can be attributed to the defect association of protons with dopants Y 3+ and Zn 2+ either in isolated octahedra (YO 6 and ZnO 6 ) or the clusters such as [ZnO 6 ]-[ZnO 6 ]…. [13,17,18]. As in case of BZCY, both intensity of dipolar loss peak in tan δ and the peak frequency increase with temperature, due to thermally activation of charge carriers.…”

“…The peaks at intermediate and higher frequencies (Fig. 7a), whose intensities are found to increase with temperature, can be attributed to the dipolar loss due to defect association of protons with dopants (Y-H) in the clusters such as [YO 6 ]-[YO 6 ]… and in the isolated octahedra [YO 6 ], respectively [13,17,18]. As the dopant (Y 3+ ) replaces Ce 4+ in the B-site of perovskite-type BCZY, the dopant associates an effective negative charge of − 1.…”

Processing and characterizations of a novel proton-conducting BaCe0.35Zr0.50Y0.15O3-δ electrolyte and its nickel-based anode composite for anode-supported IT-SOFC

“…At lower temperatures (say at 300°C), tan d (Fig. 8a) exhibits loss peaks due to the dipolar rotations in the bulk (high-frequency peak) [17] and space charge polarization at grain boundaries (low-frequency peak) [18]. As the temperature increases, diffusion of thermally activated protons from grains to grain boundaries can result in reduction of the space charge width and hence a decrease in space charge polarization at grain boundaries.…”

Grain Boundary Space Charge Effect and Proton Dynamics in Chemically Stable Perovskite‐Type Ba0.5Sr0.5Ce0.6Zr0.2Gd0.1Y0.1O3−δ (BSCZGY): A Case Study on Effect of Sintering Temperature

“…At temperatures <275°C, multiple dielectric loss peaks are present in the dielectric loss spectra. The peak at higher frequency may be attributed to dipolar rotations in the isolated octahedra such as [BO 6 ] (B = dopant) and the broad peak at low‐frequency could be due to dipolar rotations in the clusters such as [BO 6 ]–[BO 6 ]… where protons are trapped . For BSCZGY1300 at 207°C and 225°C [Fig.…”