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Two related non-centrosymmetric, cubic, quaternary chalcogenides, containing europium have been synthesized employing the molten flux method and by the reaction of europium halides with the ternary seleno-germanate, Na 6 Ge 2 Se 6 . The reactions of Eu, Ge and Se were accomplished in a molten Na 2 Se 2 flux at 800°C for 150h in an evacuated fused silica ampoule...
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