a different conditions and studied by X-ray diffraction.The (Na 0.5 La 0.5 )MoO 4 with r (Na-La) =r Na -r R =0.02Å (r-ionic radius) has the scheelite structure (sp. gr. I4 1 /a), in contrast to the (Na 0.5 Gd 0.5 )WO 4 ( r (Na-Gd) =0.13Å) and (Na,Gd,Yb)WO 4 (r Na >r Gd > r Yb ) with the pseudo-tetragonal superstructure unit cell with double parameters. The non-annealed (growth in Ar) and annealed by 1000º for 4 days in air crystals of (Na 0.500 La 0.445 Ce 0.05 Er 0.005 )MoO 4 nominal composition have "enantiomorphic" structures. The annealed by 1000º for 24 h in air crystal of (Na 0.500 La 0.295 Ce 0.20 Er 0.005 )MoO 4 has the scheelite structure. A statistical distribution of oxygen on two sites of structure of non-annealed (growth in 99%N 2 +1%O 2 ) and annealed by 700º for 100 h in air of these crystals was found.
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