Electrical conductivity of alkaline earth doped BaNd 2 O 4  spinel

Nataliia Tarasova

doi:10.15826/chimtech.10397

Electrical conductivity of alkaline earth doped BaNd₂O₄ spinel

Nataliia Tarasova

Abstract

Spinels constitute a broad class of inorganic compounds with the general formula AB₂O₄. Materials with a spinel structure display diverse physical and chemical properties. The spinel BaNd₂O₄ exhibits significant level of ionic conductivity and can considered as a promising electrolyte candidate for electrochemical energy conversion devices. The influence of the concentration of alkaline earth dopant Ba₁_‒xM_xNd₂O₄ (M = Ca, Sr) on the ionic conductivity was investigated for the first time. The calcium-doped samples did not exhibit a single-phase composition. The strontium-doped samples were isostructural with the base composition at the range 0 < x ≤ 0.15. They are characterized by the mixed ionic-hole conductivity in dry air. The strontium doping leads to increase in the conductivity values up to 1.5 orders of magnitude at low temperatures. The maximal conductivity values are observed for the Ba_0.9Sr_0.1Nd₂O₄ composition.

Keywords

spinel; layered perovskite; BaNd2O4; ionic conductivity

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References

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DOI: https://doi.org/10.15826/chimtech.10397

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