Na 3 Fe 2 Li 3 F 12 was synthesized using 10 mL of NaOH, and stoichiometric amounts of LiOH and NaFeO 2 . During stirring a precipitation was formed, which was then dissolved by adding HCl until a pH value of 2 was achieved. The solution 10 mL of 5% HF (1:10 in methanol) was added. The fluoride garnet then precipitated overnight and was purified by washing with methanol 3 times.