The influence of donor doping on the hydration and transport properties of hexagonal perovskite-related compound Ba 7 Sc 6 Al 2 O 19

Irina Animitsa; Ivan Slivnitsyn; Arina Bushueva

doi:10.15826/chimtech.10330

The influence of donor doping on the hydration and transport properties of hexagonal perovskite-related compound Ba₇Sc₆Al₂O₁₉

Irina Animitsa, Ivan Slivnitsyn, Arina Bushueva

Abstract

The new donor-doped phase with hexagonal perovskite-related structure Ba₇Sc_5.90Zr_0.10Al₂O_19.05 was obtained by Pechini method. The substitution of Sc³⁺ by Zr⁴⁺ was accompanied by the formation of oxygen interstitial defects in the hexagonal block, which led to a decrease in the degree of hydration (from 1 to 0.91 mol H₂O). This is explained by the decrease in the number of available sites for the placement of OH^-‒groups. At the same time, for dry conditions (pH₂О = 3·10⁻⁵ atm) this led to an increase in oxygen-ion conductivity as a result of the appearance of additional charge carriers. This effect was accompanied by an increase in oxygen-ion conductivity by 1 order of magnitude at 300 °C and a decrease in energy activation from 0.5 to 0.2 eV. For wet conditions (pH2O=2·10⁻² atm) the donor doping led to an increase in proton mobility, which was facilitated by the appearance of the defect and the effects of additional repulsion of like-charged and defects. As a result, the proton conductivity increased and reached significant values 3.7·10^-3 at 425 °C. The investigated phase Ba₇Sc_5.90Zr_0.10Al₂O_19.05 demonstrated the predominant protonic conductivity at Т<500 °C.

Keywords

hexagonal perovskite; donor doping; hydration; electrical properties; proton conductivity

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DOI: https://doi.org/10.15826/chimtech.10330

Copyright (c) 2026 Irina Animitsa, Ivan Slivnitsyn, Arina Bushueva

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