Compositions and methods for thermal spraying a hermetic rare earth environmental barrier coating

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A rare earth silicate-based hermetic layer (340) includes a thermal sprayed coating including a rare earth silicate having a hermetic microstructure. An environmental barrier coating (300) includes a bond coat layer (310) including silicon; and at least one rare earth silicate-based hermetic layer (340) deposited on the bond coat layer by thermal spraying. The rare earth silicate-based hermetic layer includes a thermal sprayed coating including a rare earth silicate having a hermetic microstructure. An article for service in extreme environments may be provided with such an environmental barrier coating (300).