CMAS RESISTANT THERMAL BARRIER COATING SYSTEM

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An article may include a substrate and a coating system on the substrate. The coating system may include a thermal barrier coating (TBC) layer and a CMAS resistant layer on the TBC layer. The CMAS layer includes a rare-earth (RE) monosilicate composition including a plurality of RE metal cations, wherein RE monosilicate composition is configured to react with CMAS to form a reaction product including a RE apatite phase with a RE2O3 ·SiO2 composition, wherein the RE of the RE2O3 ·SiO2 composition includes at least one of the plurality of RE metal cations of the RE monosilicate.