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- W1480070820 abstract "We report electric and magnetic properties of oxygen deficient Ba 5− x La x Nb 4− x Ti x O 15− δ phases, which have been prepared by solid-state reaction method followed by a controlled reduction process under hydrogen atmosphere. The extra electrons added by the formation of the oxygen vacancies ( δ ) introduce localized spins and the magnetic susceptibility can be described by a temperature-independent contribution and a Curie–Weiss term associated to the Ti 3+ ion formation. Besides, the experimental resistivity ( ρ ) data of these four reduced compounds are well described in a wide temperature range with the equation ρ ≈ AT exp ( B / T ) - 1 / 4 , which suggests the presence of small polarons in the system. Although, all samples present electrical insulating behavior, the electrical resistivity decreases four orders of magnitude for intermediate x values. We interpreted this fact as a consequence of the mix between the localized bands of the Nb and Ti ions, which favors the promotion of carriers due to reduction of the band gap." @default.
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- W1480070820 date "2007-02-01" @default.
- W1480070820 modified "2023-10-07" @default.
- W1480070820 title "Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5−xLaxNb4−xTixO15" @default.
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- W1480070820 doi "https://doi.org/10.1016/j.jpcs.2006.09.015" @default.
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