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In this study, KCe(WO4)2 was synthesized by a solid-state reaction of K2CO3, CeO2, and WO3 at 1273K for 12 h. The Rietveld refinement of this sample confirmed the scheelite-type (tetragonal) structure for KCe(WO4)2, with a I41/a space group and lattice parameters a = 542.4 pm and c = 1207pm. The lattice parameters for ACe(WO4)2 (A = Li, Na, or K) were in agreement with the ionic radii of the alkali metal ions, but theW­O distance in KCe(WO4)2 was found to be shorter than those in the other compounds, indicative of the distortion of WO4, attributed to the larger ionic radius of K. All of the synthesized ACe(WO4)2 materials exhibited fluorescence, with the relative emission intensity decreasing in the order of KCe(WO4)2 > NaCe(WO4)2 > LiCe(WO4)2.

journal of the ceramic society of japan

Structure and light emission of scheelite-type &lt;i&gt;A&lt;/i&gt;Ce(WO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt; (&lt;i&gt;A&lt;/i&gt; = Li, Na, or K)