Abstract
The crystal structure of NaY(MoO4)2 has been determined from powder X-ray diffraction data [space group I41/a, Z= 2, a= 5.19890(5)A, c= 11.3299(1)A]. The Na and Y atoms are disordered over the eight-coordinate sites of a scheelite structure. The crystal structure of Na5Y(MoO4)4 has been determined from single-crystal X-ray diffraction data [space group I41/a, Z= 4, a= 11.374(3)A, c= 11.440(5)A] and found to be scheelite related, with the tetrahedral sites occupied by, an ordered arrangement of Mo and Na in a 4 : 1 ratio. Comparisons are drawn between the structures of these two closely related phosphor materials.
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