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Since Si4+ has a strong tetrahedral site preference, Sr3Si3O9 does not crystallize in the perovskite structure. Instead, it forms a layered
(SrSiO3)3 structure containing close-packed planes of Sr2+ in trigonal-prismatic coordination separated by a layer of Si3O9 units containing three
SiO4 tetrahedra sharing corners in a triangular plane of oxygen parallel to the Sr2+ planes.   Çó·­Òë
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