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Abstract
Eu3+ and Tb3+ intercalations were studied on layered titanic acids. H2Ti307, H2Ti409. H20, and their alkylammonium complexes in aqueous chloride solutions. The lanthanoid ions were taken up into the alkylammonium complexes but were not detected in the products obtained directly from H2Ti307 and H2Ti409. H20. The interlayer alkylammonium ions were quantitatively exchanged with hydrated Eu3+ and Tb3+ ions during the reactions. The layered Eu titanate showed red luminescence under excitation at 400 nm and the Tb titanate emitted green luminescence by 380 nm excitation. The luminescence spectra of the Eu titanates are discussed in relation to the crystal structure of titanates.
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