Question: Fluorite, CaF2 , has a cubic unit cell with 4 formula units per unit cell. Each edge of the unit cell is 0.5463 nm. Assuming

Fluorite, CaF2 , has a cubic unit cell with 4 formula units per unit cell. Each edge of the unit cell is 0.5463 nm. Assuming that the unit cell dimensions remain the same for a nonstoichiometric compound of fluorite containing some YF3 , determine the formula (CaxYyFz ) and the density of fluorite doped with 5.0 mole% YF3 if charge balance is maintained by having: a) ion vacancies rather than interstitial ions. b) interstitial ions and no ion vacancies

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