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The crystal structure of Sr 2 MgSi 2 O 7  with tetragonal,  a  = 7.9957(10),  c  = 5.1521(9) Å,  Z  = 2, space group  P [unk]2 1  m  has been refined to  R  = 4.3% from three-dimensional single-crystal, X-ray diffraction data by full-matrix least-squares calculations. This compound is completely isomorphous with åkermanite, Ca 2 MgSi 2 O 7 , and the Mg and Si atoms are distributed respectively in the T(1) and T(2) sites of the melilite structure. The tetrahedral Mg – O bond length (1.942 Å) is clearly longer than that in Ca 2 MgSi 2 O 7  (1.915 Å), which exhibits the flexibility of T(1) site in melilite structures. In the system Ca 2 MgSi 2 O 7  – Sr 2 MgSi 2 O 7  the tetragonal parameters of the solid solutions are linear functions of molar compositions, which implies that this solid solution is continuous.

The structural properties of synthetic Sr-åkermanite, Sr 2 MgSi 2 O 7