In the present study, novel scheelite-type (tetragonal) LiCe(WO 4 ) 2 was synthesized through a solid-state reaction between Li 2 CO 3 , CeO 2 , and WO 3 . Rietveld refinement of the product indicated the presence of an almost single-phase material with crystal structure of the space group I4 1 /a, having parameters of a = 529.
In this study, KCe(WO 4 ) 2 was synthesized by a solid-state reaction of K 2 CO 3 , CeO 2 , and WO 3 at 1273 K for 12 h. The Rietveld refinement of this sample confirmed the scheelite-type (tetragonal) structure for KCe(WO 4 ) 2 , with a I4 1 /a space group and lattice parameters a = 542.4 pm and c = 1207 pm. The lattice parameters for ACe(WO 4 ) 2 (A = Li, Na, or K) were in agreement with the ionic radii of the alkali metal ions, but the WO distance in KCe(WO 4 ) 2 was found to be shorter than those in the other compounds, indicative of the distortion of WO 4 2 , attributed to the larger ionic radius of K + . All of the synthesized ACe(WO 4 ) 2 materials exhibited fluorescence, with the relative emission intensity decreasing in the order of KCe(WO 4 ) 2 > NaCe(WO 4 ) 2 > LiCe(WO 4 ) 2 .
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