Various embodiments relate to a method comprising combining a chelating agent, one or more non-aqueous organic solvents and one or more metallic compounds to produce an oxide ceramic solid in a non-aqueous solution based reaction, wherein the oxide ceramic solid contains metal-oxygen-metal bonds. The oxide ceramic solid can comprise, for example, a gel or a powder. Various devices, including electrolyte interfaces and energy storage devices, are also provided. In one embodiment, the oxide ceramic solid is a cubic garnet having a nominal formula of Li7La3Zr2O12 (LLZO).