Eu Ions Site-selective Doping and Nonstoichiometric Chemistry of NaTaO3 in Na-rich Environment

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The electronic structure of Eu-doped NaTaO_3 in Na-rich environment is investigated by the first-principles theory. By simulating the two different models of Eu~(3+) ions selectively located in Ta and Na sites, respectively, the band gaps of two Eu-doped
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