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About
The anti-fluorite framework: oxide ions occupy the fcc sites that calcium takes in fluorite, while potassium ions fill all the tetrahedral holes — the cation/anion roles of fluorite reversed. Each O²⁻ is surrounded by eight K⁺.
Structure
Prototypeanti-fluorite
Crystal systemcubic
Space groupFm-3m (225)
Latticea = 6.436 Å
Anglesall 90°
Elements
Also crystallizes this way
Li2ONa2OK2SRb2O
Sources
- Structure: Crystallography Open Database (COD)
- Lattice parameters: Wyckoff, Crystal Structures — a = 6.436 Å