Silicon based substrate with environmental/thermal barrier layer

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An article comprising a substrate containing silicon and at least one barrier layer which functions as a thermal barrier at temperatures in excess of 1300 DEG C in aqueous environments. In one embodiment there is provided a substrate comprising silicon and at least one barrier layer containing TaOx (where x = 1 to 3), for example, Ta2O5, and an oxide selected from the group consisting of MgO, CaO, SrO, BaO, Al2O3, Y2O3, La2O3, Re2O3 (where Re is a rare earth element) and mixtures thereof.