Thermal barrier coatings with low thermal conductivity

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Embodiments of the present disclosure are on an article (10) directed. The article (10) comprises a superalloy substrate (14), an adhesive layer and a thermal barrier coating on the 16 (20) is arranged. The thermal barrier coating (20) on the adhesive layer (16) comprises an inner ceramic layer arranged and (22) and an outer ceramic layer (24). The outer ceramic layer (24) comprises a material, which has a composition of formula I. (Alkaline earth metal)X is(Rare earth metal)Y is(Of Zr, RF, Of Ti)Z isIS OδIn formula I X is 0>, Y is 0>, Z is 0>, δ>0 and [y/(x + y + z)] ≥ 0, 28. The compositions according to formula I structure has a cubic fluorite.