Effect of acceptor and donor doping on the state of protons in block-layered structures based on BaLaInO4

Spectroscopic and transport properties of Ba‐ and Ti‐doped BaLaInO4

“…In addition, it was proved that most investigated compositions based on BaLaInO 4 demonstrate nearly pure protonic type of conductivity under wet air and low (<400°C) temperatures. Moreover, these compositions showed good chemical stability against of carbon dioxide and high water pressure [ 44 ] as opposed to well‐known proton conductors such as doped barium cerate and other proton conducting perovskites. [ 45–47 ]…”

“…In addition, it was proved that most investigated compositions based on BaLaInO 4 demonstrate nearly pure protonic type of conductivity under wet air and low (<400 C) temperatures. Moreover, these compositions showed good chemical stability against of carbon dioxide and high water pressure [44] as opposed to well-known proton conductors such as doped barium cerate and other proton conducting perovskites. [45][46][47] The realization of acceptor and donor doping is accompanied by the simultaneous changes in characteristic of investigated compositions, such as lattice parameters, bonds lengths, polyhedra tilt angles, and of the concentration of oxygen defects.…”

Simultaneous Hetero- and Isovalent Doping as the Strategy for Improving Transport Properties of Proton Conductors Based on BaLaInO4

“…Over the past forty years, the proton-conducting solid oxides went beyond perovskites family ( Figure 1 ). After variously doped barium cerates and zirconates [ 8 , 9 , 10 ], classes of proton-conducting materials like hexagonal [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ], oxygen-deficient [ 18 , 19 , 20 ], block-layered [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ] perovskites, brownmillerites [ 32 , 33 , 34 ], pyrochlores [ 35 , 36 , 37 , 38 ], apatites [ 39 ], monazites [ 40 , 41 , 42 ], gallium-based oxides [ 43 , 44 , 45 ], materials with fluorite- [ 46 , 47 , 48 ], fergusonite- [ 49 , 50 , 51 ], and weberite-types [ 52 , 53 ] of structures were described.…”

“…From the point of view of protonic conductivity, the layered perovskites based on BaLaInO 4 , SrLaInO 4 , BaNdInO 4, and BaNdScO 4 were investigated [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. The possibility of acceptor (Ca 2+ /Sr 2+ /Ba 2+ → La 3+ /Nd 3+ ) and donor (Zr 4+ /Ti 4+ /Nb 5+ → In 3+ ) doping was proven.…”

“…The possibility of acceptor (Ca 2+ /Sr 2+ /Ba 2+ → La 3+ /Nd 3+ ) and donor (Zr 4+ /Ti 4+ /Nb 5+ → In 3+ ) doping was proven. It was shown that a significant amount of protons (up to 1.5 mol) are achieved only for doped compositions, and the increase of dopant concentration leads to the increase in water uptake due to increase in the interlayer space [ 31 ]. In the other words, the amount of proton current carriers in the structure increases with an increasing acceptor or dopant content.…”