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- W2905949256 abstract "Using Ce LIII edge X-ray absorption near edge spectroscopy (XANES), it is shown that acceptor dopants introduced to cerium members of the rare earth ortho-niobate series, Ce1-xSrxNbO4±δ and Ce1-xCaxNbO4±δ, are charge compensated by the formation of holes on the cerium sublattice. These spectroscopic studies are complemented by structural studies, using X-ray and neutron powder diffraction, determining that the solubility limit of the strontium and calcium dopants within the CeNbO4+δ structure is ~10% and ~30% respectively. Under oxidising conditions, the Ce3+/Ce4+ redox couple facilitates reversible redox processes, and it is observed that the Ce1-xSrxNbO4±δ and Ce1-xCaxNbO4±δ materials form commensurate and incommensurately modulated oxygen hyperstoichiometric phases as a function of temperature. Under reducing atmospheres, this redox activity is suppressed, and charge-compensating Ce4+ holes are annihilated." @default.
- W2905949256 created "2019-01-01" @default.
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- W2905949256 date "2019-03-01" @default.
- W2905949256 modified "2023-10-15" @default.
- W2905949256 title "Redox behaviour and solid solubility of cerium ortho-niobates" @default.
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- W2905949256 doi "https://doi.org/10.1016/j.jssc.2018.12.042" @default.
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