Electrical properties of new protonic conductors Ba1+xLa1-xInO4-0.5x with Ruddlesden-Popper structure

The new proton-conducting complex oxides Ba1 + & x445;La1-& x445;InO4-0.5 & x445; (0 <= x <= 0.15) with Ruddlesden-Popper structure were obtained. It was established that all investigated samples were capable for the water uptake from the gas phase. The increasing the dopant concentration led to increase in the size of cell volume due to increase in the size of [La, BaO] blocks, as a result, water uptake increased. The doping led to the increase in the ionic (O2-, H+) conductivity up to the dopant concentration x = 0.1. It was proved that all investigated samples are purely protonic conductors under wet conditions and T < 500 degrees C, and that cationic doping of BaLaInO4 allows a significant increase (up to 1.5 order of magnitude) in proton conductivity.