Novel mid-temperature Y3+ → In3+ doped proton conductors based on the layered perovskite BaLaInO4

Advanced Proton-Conducting Ceramics Based on Layered Perovskite BaLaInO4 for Energy Conversion Technologies and Devices

“…They were about 95% below 400 °C for the composition BaLa 0.9 Nd 0.1 InO 4 . The same protonic conductivity transport numbers were obtained earlier for the BaLaIn 0.9 Sc 0.1 O 4 [ 54 ] and BaLaIn 0.9 Y 0.1 O 4 [ 55 ] compositions also.…”

“…The dehydration temperature is higher when OH-groups are more strongly bonded to the crystal lattice and are less involved in hydrogen bonds. Low-temperature protons (200–350 °C) are removed first and corresponded to the strongly bonded hydroxyl groups [ 55 ]. High-temperature protons (350–700 °C) are removed later and corresponded to the weakly bonded or relatively isolated hydroxyl groups.…”

“… The dependency of water uptake vs. unit cell volume for the compositions BaLa 0.9 Nd 0.1 InO 4 (Nd), BaLaIn 0.9 Sc 0.1 O 4 (Sc) [ 54 ], BaLaIn 0.9 Y 0.1 O 4 (Y) [ 55 ], BaLaInO 4 (In) [ 49 ]. The blue area defines the water uptake area for the acceptor- and donor-doped compositions based on BaLaInO 4 with 0.1 mol dopant content [ 62 ].…”

“…Layered perovskites with general formula AA′BO 4 where A is Ba or Sr, A′ is La or Nd, and B is In or Sc were described as ionic (oxygen-ionic and protonic) conductors in the past few years [ 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 ]. It was proved that doping in the cationic sublattices is the successful way for improving protonic conductivity up to ~1.5 orders.…”

“…However, isovalent doping shows even more meaningful results. Earlier, we reported about the possibility of isovalent doping of B-sublattice of layered perovskite BaLaInO 4 by the ions with different radii (Y, Sc) [ 54 , 55 , 56 ]. In this paper, we focused on the modification of BaLaInO 4 structure by the isovalent doping in the A (lanthanum) sublattice ( Figure 1 ).…”