Transport Properties of In3+- and Y3+-Doped Hexagonal Perovskite Ba5In2Al2ZrO13

High Proton Conduction in the Octahedral Layers of Fully Hydrated Hexagonal Perovskite-Related Oxides

“…(d) Plots of the fractional water uptake F w (= y /2δ) in hydrated perovskite-type and hexagonal perovskite-related oxides against the amount of oxygen vacancies δ in dry materials, showing the proton concentration y of hydrated materials. The blue solid circle stands for the data of BEAS, and black, green, and blue open circles denote the data of Ba B O 3−δ ·( y /2)­H 2 O perovskites, ,− B -site-deficient hexagonal perovskite-related materials with the intrinsically oxygen-deficient cubic close-packed c′ layer Ba B 1– x O 3−δ ·( y /2)­H 2 O ( x = 1/3, 2/7), , and Ba B O 2.8−δ ·( y /2)­H 2 O hexagonal perovskite-related materials with h′ layer, respectively. ,, Here, B cations are relatively smaller than Ba 2+ .…”

“…13,35 and BaBO 2.8−δ •(y/2)H 2 O hexagonal perovskite-related materials with h′ layer, respectively 25,26,30. Here, B cations are relatively smaller than Ba 2+ .…”

“…Many hexagonal perovskite-related oxides also contain cubic close-packed (c) and/or anion-deficient cubic close-packed (c′) layers. Recently, the hexagonal perovskite-related oxides have been reported to exhibit significant proton conduction without chemical doping due to the presence of intrinsic oxygen vacancies. ,,− Here, the intrinsic oxygen vacancies are the oxygen vacancies in a parent material. However, the proton conduction of hexagonal perovskite-related oxides has not been extensively studied compared to that in AB O 3−δ perovskite oxides. − Murakami et al reported Ba 5 Er 2 Al 2 ZrO 13 as a new class of proton conductors with high proton conductivity comparable to those of representative proton conductors (e.g., 10 –3 S cm –1 at 300 °C).…”

Synthesis and electrical properties of doped layered perovskites based on BaMInO4 (M = Y, Gd)

“…The barium zirconate crystallises in the classic perovskite ABO3 structure. However, several years ago the possibility of proton transport was demonstrated for layered [25][26] and hexagonal perovskites [27][28][29]. Layered perovskites such as complex oxides materials based on nickelates lanthanides can be considered as efficient cathode materials [30][31][32][33].…”