Low thermal conductivity thermal barrier coating system and method therefor

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In accordance with an embodiment of the invention, a thermal barrier coating for inclusion in a thermal barrier coating system is provided. The thermal barrier coating comprises a compound having a rhombohedral phase. In accordance with another embodiment of the invention, a thermal barrier coating is provided that comprises a compound having the formula of : A4B3O12, wherein A is at least one rare earth element; and B is selected from the group consisting of Zr, Hf and mixtures thereof.