Abstract
In this paper, the review of the new class of ionic conductors was made. For the last several years, the layered perovskites with Ruddlesden-Popper structure AIILnInO4 attracted attention from the point of view of possibility of the realization of ionic transport. The materials based on Ba(Sr)La(Nd)InO4 and the various doped compositions were investigated as oxygen-ion and proton conductors. It was found that doped and undoped layered perovskites BaNdInO4, SrLaInO4, and BaLaInO4 demonstrate mixed hole-ionic nature of conductivity in dry air. Acceptor and donor doping leads to a significant increase (up to ~1.5–2 orders of magnitude) of conductivity. One of the most conductive compositions BaNd0.9Ca0.1InO3.95 demonstrates the conductivity value of 5 × 10−4 S/cm at 500 °C under dry air. The proton conductivity is realized under humid air at low (<500 °C) temperatures. The highest values of proton conductivity are attributed to the compositions BaNd0.9Ca0.1InO3.95 and Ba1.1La0.9InO3.95 (7.6 × 10−6 and 3.2 × 10−6 S/cm correspondingly at the 350 °C under wet air). The proton concentration is not correlated with the concentration of oxygen defects in the structure and it increases with an increase in the unit cell volume. The highest proton conductivity (with 95−98% of proton transport below 400 °C) for the materials based on BaLaInO4 was demonstrated by the compositions with dopant content no more that 0.1 mol. The layered perovskites AIILnInO4 are novel and prospective class of functional materials which can be used in the different electrochemical devices in the near future.
Highlights
The general formula of these compositions can be written as AIILnBaNdInO
Despite the layered perovskites first reported in the mid 1950s [12,13,15], the importance of these materials was initially limited by the discovery of superconductivity in cuprate La2-x Bax CuO4, discovered in 1986 [19]
The authors showed that introduction of oxygen vacancy by increasing of Sr2+ /La3+ ratio on A-site of the layered perovskite LaSrInO4 was effective for increasing oxide ion conductivity
Summary
InO4-δa new was structure accompanied byofa oxide-ion decrease conducting in conductivity [114],based which explained family material, onisthe composiby a decrease the discovered unit cell volume. 0 are larger among (concentrations the compositionofAA cations and is a smaller tiveness defects), an important parameter affecting oxygen-ion conduc cation, choice ofin. In cations wasInbased on the following considerations: the tivity is the an increase theBa, lattice volume. Ba/Nd cations and the analogs of layered perovskites may be of interest. The inter is slightly stitial oxygens are located in the NaCl-layer and coordinated of A-cations.
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