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Infrared and Raman spectra have been measured of scheelites with formula ALnW 8 O 8 , ALnMo 2 O 8  (A = Li, Na, K; Ln = La, Y), Y 2 MWO 8  M = Ge, Si), Y 2 GeMoO 8  and the zircon Y 2 SiMoO 8  in order to get information about the crystallographic order. The A +  and Ln 3+  ions in the scheelites ALnW 2 O 8  and ALnMo 2 O 8  are probably ordered in layers Ln-Ln-A-A perpendicular to the c-axis. The order is short-range only. The degree of order decreases in the sequence K, Na, Li. The compounds Y 2 MWO 8  and Y 2 GeMoO 8  are not ordered, whereas the Si 4+  and Mo 6+  ions in Y 2 SiMoO 8  are ordered in alternate layers perpendicular to the c-axis. The use of vibrational spectra for the determination of crystallographic order is discussed.

Spectroscopical Investigation of Order-disorder in Some Compounds with Scheelite Structure