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Transmission electron microscopy (TEM) was used to study the structural changes that occur in aluminate sodalite, Ca 8 [Al 12 O 24 ](CrO 4 ) 2 , when it is heated with the electron beam. Initially, a twinned orthorhombic crystal was heated, and it transformed to tetragonal and then to cubic symmetry. The cubic phase contains two-dimensional periodic antiphase boundaries (APBs) along the {110} planes. The APBs are about 54 Å apart. Structural modulations also occurred during the transformations. The transition from tetragonal to orthorhombic symmetry is also associated with random transformation twins on a {110} plane; this plane is both the composition and twin plane.

Direct observation of phase transitions in aluminate sodalite, Ca 8 [Al 12 O 24 ](CrO 4 ) 2