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Keywords:

  • high-pressure chemistry;
  • oxides;
  • perovskite phases;
  • “soft” chemistry;
  • vacancy ordering
Thumbnail image of graphical abstract

Dense metastable phases obtained under “hard” high-pressure conditions may contain instabilities such as unusual oxidation states or coordination environments that may be partially relieved by “soft” low-temperature chemistry. The synthesis of SrCrO2.8 (see picture, left) and SrCrO2.75 (right) phases from the high-pressure perovskite SrCrO3 leads to a relaxation of the coordination around Cr4+ from octahedral to tetrahedral.