Tungsten oxide for reversible alkali metal intercalation reactions

摘要

An improved electrochromic layer containing M.sub.X WO.sub.Y, M.sub.X NiO.sub.Y, M.sub.X VO.sub.Y, M.sub.X MoO.sub.Y, M.sub.XCrO.sub.Y, M.sub.X RuO.sub.Y, M.sub.X IrO.sub.Y, or M.sub.X TiO.sub.Y, where M is selected from the group consisting of alkali metals and alkaline earth metals, X is less than 0.06 and Y is in the range from 2 to 3.2. The layer contains the alkali metal or alkaline earth metal when the electrochromic layer is formed.