A new Eu(III) germanate, KEuGe2O6, has been synthesized by both the flux-growth method and the high-temperature, high-pressure hydrothermal method and characterized by single-crystal X-ray diffraction. The compound contains parallel zigzag chains of edge-sharing Eu-O polyhedra, which are in turn linked by sharing vertices and edges with three-membered single ring Ge3O96- germanate anions to form a 3-D framework structure. The magnetic and luminescence properties were also investigated. The observed χMT value at 300 K is 4.53 emu K mol-1, which is in good agreement with the calculated value for three Eu3+ ions. The sharp peaks in the room-temperature emission spectrum are assigned. The number of lines in the region of the 5D0→7F0 transition and the relative intensities of the 5D0→7F 1 and 5D0→7F2 transitions confirm the presence of two local Eu3+ environments and strongly distorted Eu3+-ligand surroundings. The reasons for the very short emission life time is discussed. The Sm and Tb analogues have also been synthesized.
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Chen, P. (Contributor), Chiang, P. (Contributor), Yeh, H. (Contributor), Chiang, P. (Contributor), Chen, P. (Contributor), Chang, B. (Contributor), Yeh, H. (Contributor), Chang, B. (Contributor), Lii, K. (Contributor) & Lii, K. (Contributor), The Cambridge Structural Database, 1 Jan 2008