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The Ca-rich part of the cation substitution series of aluminate sodalites (Ca 1− x  Sr  x  ) 8 [Al 12 O 24 ](WO 4 ) 2  has been studied as a function of temperature and composition. The intermediate  β -phase of pure calcium tungstate aluminate sodalite was found to have a (3 + 2)-dimensional commensurately modulated structure with an isometric unit cell. The probable superspace group is  Abm 2( α  0  γ ) 0 s 0, 000 with  α  = ¼,  γ  = ¼,  a  =  b  = [unk] · 9.301(1) Å,  c  = 9.301(1) Å at 636 K. Its average structure was found to be similar to that of the room-temperature  γ -phase. In crystals with 0 &lt;  x  ≤ 0.18 the existence of a new intermediate phase could be confirmed. At variance with the otherwise very similar room-temperature phase with  x  = 0, this  γ ′-phase has an incommensurate modulation vector. Its proposed superspace group is  Abm 2(½ 0  γ ) 0 ss  with  γ  = 0.05(1). Within the precision of our TEM-experiments  γ  does not change with temperature or composition. The average structure of the  γ ′-phase could be refined and was found closely related with the average structure of  γ -CAW.

Intermediate phases in the Ca-rich part of the system (Ca 1− x Sr x ) 8 [Al 12 O 24 ](WO 4 ) 2