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Synthetic strontium gallate Sr 3 Ga 4 O 9  is triclinic, space group  P 1̅ ( a  = 6.7490(9)Å,  b  = 8.0494(12)Å,  c  = 9.7295(15)Å,  α  = 85.01(2)º,  β  = 72.71(2)º,  γ  = 74.24(2)º,  V  = 485.7(3)Å 3 ,  Z  = 2,  D  calc  = 4.69 g·cm -3 ). The structure was solved by direct methods using 2656 unique reflections and refined to a residual of  R 1 = 0.042 (146 parameters). The compound belongs to the group of tetrahedral single layer structures. Individual sheets are parallel to (100), thus producing a prominent cleavage. The stepped layers can be described as being built by the condensation of six tetrahedra-wide bands. The bands in turn consist of two open branched dreier single chains connected via common corners and they contain tertiary and quaternary tetrahedra Q 3  and Q 4  in the ratio 1:1. The stacking of the layers containing four-, six- and eight-membered rings results in a three-dimensional structure in which the strontium cations reside in the voids between the layers and are coordinated by six to seven oxygen neighbors.

Sr 3 Ga 4 O 9 – a strontium gallate with a new type of tetrahedral layer structure