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Single crystals of strontium danburite, SrB 2 Si 2 O 8 , were found after high-pressure treatment of SrSiO 3 /SiO 2 /Al 2 O 3  mixtures at 40 kbar and 1400°C, obviously formed by an unwanted side reaction with the boron oxide-containing boron nitride capsules used. The crystals are orthorhombic, space group Pnma, with a = 8.1891 (5), b = 7.9311 (6), c = 8.9284(5) Å and Z = 4. The structure was refined to R = 0.031, R w  = 0.028 for 590 independent, absorption-corrected reflections. SrB 2 Si 2 O 8  is isostructural with danburite (CaB 2 Si 2 O 8 ). The structure comprises a tetrahedral framework of ordered B 2 O 7  and Si 2 O 7  groups which contains Sr in irregular coordination.

Hochdrucksynthese und Strukturverfeinerung von Strontium-Danburit, SrB 2 Si 2 O 8