Abstract
The discovery of new perovskite compounds under high pressure mainly focuses on the ABO3 compositions and the compositions highly deviated from ABO3 are less explored. Here we demonstrate that the La6Sr3Si6O24 silicate composition can be stabilized as a hexagonal perovskite-related structure with isolated tetrahedra anions under high pressure of 6 GPa. The compound adopts 9-layer shifted hexagonal perovskite-like structure with both B-cation and oxygen deficiencies and contains pseudo-cubic (c′) (La/Sr)O2 layers and hexagonal (h) (La/Sr)O3 layers stacked according to (c′hh)3 sequence. This structure features both B-cation vacancy ordering between the two consecutive hexagonal layers and oxygen vacancy ordering in c′-(La/Sr)O2 layers, resulting in isolated tetrahedral SiO4 anions and ionic conduction behavior. This work demonstrates the practicability of accessing new perovskite-related functional materials from the compositions highly deviated from ABO3 under high pressure.
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