Abstract
The experimental data are presented for magnetic susceptibility and electrical conductivity in PrBaCo2O6–δ at 850–1223 K. The decrease of oxygen content at heating is accompanied by formation of Co3+ cations that may simultaneously reside in oxygen pyramidal and octahedral coordination with intermediate and high spins, respectively. The small polaron p-type electron transport is shown to be mediated by the intermediate-spin Co3+ while high-spin Co3+ cations in octahedral environment are excluded from polaron jumps due to the spin blockade effect.
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