Article and method of making thereof

An article, comprising:

• a substrate;
• and
• a plurality of coatings disposed on the substrate, the plurality of coatings comprising:
• a thermal barrier coating disposed on the substrate;
• and
• a protective overlaying coating comprising a calcium-magnesium-aluminum-silicon-oxide (CMAS)-reactive material disposed on the thermal barrier coating, the CMAS-reactive material having a formula Gd3BO7 and an orthorhombic weberite crystal structure,
• wherein B is at least one element selected from the group consisting of tantalum and niobium and wherein the CMAS-reactive material is present in the plurality of coatings in an effective amount to react with a CMAS composition at an operating temperature of the thermal barrier coating, thereby forming a reaction product having one or both of melting temperature and viscosity greater than that of the CMAS composition, and wherein the CMAS-reactive material is present in the plurality of coatings in an amount in a range from about 10 volume percent to about 75 volume percent of the plurality of coatings.