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PREPARATION AND CHARACTERIZATION OF Eu-MAGADIITE INTERCALATION COMPOUNDS

¹ Department of Applied Chemistry, Waseda University, Ohkubo 3-4-1, Shinjuku-ku, Tokyo 169-8555, Japan
² Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, Nishiwaseda 2-8-26, Shinjuku-ku, Tokyo 169-0051, Japan
³ PRESTO, Japan Science and Technology Corporation (JST)
⁴ Department of Earth Sciences, Waseda University, Nishiwaseda 1-6-1, Shinjuku-ku, Tokyo 169-8050, Japan

^* E-mail address of corresponding author: makato{at}waseda.ac.jp

The intercalation of europium ions (Eu³⁺) into the interlayer space of a layered silicate, magadiite, was conducted by ion-exchange reactions between magadiite and europium(III) chloride. X-ray diffraction and elemental analysis results indicated that Eu³⁺ cations were intercalated into the interlayer space of magadiite. The ion exchange between Eu³⁺ and Na⁺ occurred preferentially so that the adsorbed Eu³⁺ amounts were controlled quantitatively. Thermal transformation of the original layered structure was suppressed by the intercalation of Eu³⁺. The resulting intercalation compounds exhibited photoluminescence arising from the intercalated Eu³⁺. The luminescence intensity varied in accordance with the amount of Eu³⁺ absorbed, suggesting that the self-quenching occurred at higher loading levels. The luminescence intensity was also changed by the heat treatment, corresponding to the change in the surroundings of the Eu³⁺ adsorbed, induced by the removal of the adsorbed water molecules and the hydroxyl groups of the silicate.

Key Words: Europium • Intercalation • Luminescence • Magadiite • Nanocomposite

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