Fig. 3: Structural features of M3HCh antiperovskites (M = Li, Na).
From: Hydride-based antiperovskites with soft anionic sublattices as fast alkali ionic conductors
a Normalized (cubic) lattice parameters of M3HCh. For orthorhombic o-Na3HS, the cubic lattice parameter is an average of normalized lattice parameters. Lines are for the eye guidance. b The hydride anion (H–) size obtained by subtracting M+ radius from H––M+ bond length. Open triangles indicate the ionic radius of H– in hypothetical cubic c-Na3HS, which is calculated by using the average normalized cubic lattice parameter of the orthorhombic o-Na3HS. c BVS values for Ch2–. Open triangles indicate the S2– BVS for hypothetical cubic c-Na3HS. d Variation in bond length of B–M in BM6 (B = H–, N3–, O2–, F–) octahedra for M3BA antiperovskites and B–O in BO6 (B = Fe3+, Cr3+, Zr4+) octahedra for ABO3 perovskites. The mentioned studies refer to Supplementary References (S1–S8).
