Abstract

In water-molecule-doped barium peroxide and barium oxide, a step increase in the dynamic conductivity to ∼10−3 Ω−1 cm−1 was found. The increase is observed when water molecules are present in two nonequivalent states in the lattice, with concentrations of the molecules n t of ≥2.2×1021 cm−3. At n>n t , the conductivity does not depend on the number of molecules in the lattice but is temperature-dependent, obeying the law σ(T = C 1exp(−E 1/kT) + C 2exp(−E 2/kT. The run of the σ(n, T) curve is explained by trapping electrons that result from H2O dissociation and by two sorts of carrier jumps between localized and delocalized states.

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