Lithium lanthanum zirconate thin films

A coated substrate formed by a coated substrate comprising:

• disposing zirconium oxide on a substrate to yield a zirconium oxide coating on the substrate;
• contacting the zirconium oxide coating with a solution comprising a lithium salt and a lanthanum salt;
• heating the substrate to yield a dried salt coating on the zirconium oxide coating;
• melting the dried salt coating to yield a molten salt mixture;
• reacting the molten salt mixture with the zirconium oxide coating to yield lithium lanthanum zirconate;
• and
• cooling the lithium lanthanum zirconate to yield the coated substrate, wherein the coated substrate comprises a lithium lanthanum zirconate coating on the substrate.

A coated substrate formed by a coated substrate comprising:

• disposing zirconium oxide on a substrate to yield a zirconium oxide coating on the substrate;
• heating an aqueous mixture comprising a lithium salt and a lanthanum salt to yield a molten salt mixture;
• contacting the zirconium oxide coating with the molten salt mixture;
• reacting the molten salt mixture with the zirconium oxide coating to yield lithium lanthanum zirconate;
• and
• cooling the lithium lanthanum zirconate to yield the coated substrate, wherein the coated substrate comprises a lithium lanthanum zirconate coating on the substrate.