The novel Zn-doped hexagonal perovskite Ba 7 In 6 Al 2 O 19 :  electrical conductivity and hydration

Irina Animitsa; Daniil Korona; Arina Bushueva; Roman Andreev; Sergey Nokhrin

doi:10.15826/chimtech.2024.11.4.03

The novel Zn-doped hexagonal perovskite Ba₇In₆Al₂O₁₉: electrical conductivity and hydration

Irina Animitsa, Daniil Korona, Arina Bushueva, Roman Andreev, Sergey Nokhrin

Abstract

The novel phase Ba₇In_5.9Zn_0.1Al₂O_18.95 with hexagonal perovskite structure was obtained by solid-state technique. The substitution of In³⁺ by the Zn²⁺ leads to the expansion of the lattice parameters and cell volume. It was established that the investigated sample is capable of water incorporation from the gas phase; the degree of hydration reaches 1.42 mol H₂O, which is significantly higher than that for the undoped phase (0.41 mol H₂O). This is a result of the expansion of the hexagonal layer that facilitates the placement of OH^–-groups. The oxide-ion and proton conductivities for the doped Ba₇In_5.9Zn_0.1Al₂O_18.95 sample were higher than those for the undoped composition, Ba₇In₆Al₂O₁₉, by 0.50 and 0.75 orders of magnitude (500 °C), respectively. The new phase Ba₇In_5.9Zn_0.1Al₂O_18.95 demonstrates the predominant protonic conductivity at Т ≤ 500 °C and pH₂O = 1.93·10⁻² atm.

Keywords

hexagonal perovskite; proton conductivity; hydration; transport numbers

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DOI: https://doi.org/10.15826/chimtech.2024.11.4.03

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