X-ray photoelectron study of the valence state of iron in iron-containing single-crystal (BiFeO3, PbFe1/2Nb1/2O3), and ceramic (BaFe1/2Nb1/2O3) multiferroics von Kozakov, A.T., Kochur, A.G., Googlev, K.A., Nikolsky, A.V., Raevski, I.P., Smotrakov, V.G., Yeremkin, V.V.

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