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The crystal structure of Sc 3 Ir 4 Si 13+ x    ( x  = 0.22) [space groupP   m3   ‾n$Pm\bar{3}n$,  a  = 8.4651(1) Å] is found to be a new disordered variant of the primitive cubic Yb 3 Rh 4 Sn 13  Remeika prototype. The silicide is stable in the narrow temperature range of 1283–1397 °C and reveals metallic properties. The crystal structure of Sc 4 Ir 7 Ge 6  [U 4 Re 7 Si 6  type, space groupI   m3   ‾m$Im\bar{3}m$,  a  = 8.1397(8) Å] is refined for the first time. The electronic band structure calculations reveal that the properties of this germanide can be explained based on the free electron gas model. Both compounds reveal close structural relationships to the simple perovskite structure.

Sc 3 Ir 4 Si 13+ x and Sc 4 Ir 7 Ge 6 – the perovskite-related crystal structures