An environmental barrier coating for high temperature ceramic components , the barrier coating comprising: a bond coat layer comprising silicon metal, silicide or a combination thereof; an optional silica layer ; and at least one transition layer including: from 85% to 99% by volume of the transition layer of a primary transition material being a rare earth disilicate, or a doped rare earth disilicate; and from 1% to 15% by volume of the transition layer of a secondary material selected from the group consisting of Fe 2 O 3 , iron silicates, rare earth iron oxides, Al 2 O 3 , mullite, rare earth aluminates, rare earth aluminosilicates, TiO 2 , rare earth titanates, Ga 2 O 3 , rare earth gallates, NiO, nickel silicates, rare earth nickel oxides, Lnb metals, Lnb 2 O 3 , Lnb 2 Si 2 O 7 , Lnb 2 SiO 5 , borosilicate glass, alkaline earth silicates, alkaline earth rare earth oxides, alkaline earth rare earth silicates, and mixtures thereof, wherein "Lnb" refers to a sub-set of rare earth metals having a melting point below 1450°C; wherein the transition layer comprises the primary transition material and at least one slurry sintering aid, and wherein the transition layer comprises a porosity of from 0% to 15% by volume of the transition layer. a bond coat layer comprising silicon metal, silicide or a combination thereof; an optional silica layer ; and at least one transition layer including: from 85% to 99% by volume of the transition layer of a primary transition material being a rare earth disilicate, or a doped rare earth disilicate; and from 1% to 15% by volume of the transition layer of a secondary material selected from the group consisting of Fe 2 O 3 , iron silicates, rare earth iron oxides, Al 2 O 3 , mullite, rare earth aluminates, rare earth aluminosilicates, TiO 2 , rare earth titanates, Ga 2 O 3 , rare earth gallates, NiO, nickel silicates, rare earth nickel oxides, Lnb metals, Lnb 2 O 3 , Lnb 2 Si 2 O 7 , Lnb 2 SiO 5 , borosilicate glass, alkaline earth silicates, alkaline earth rare earth oxides, alkaline earth rare earth silicates, and mixtures thereof, wherein "Lnb" refers to a sub-set of rare earth metals having a melting point below 1450°C; wherein the transition layer comprises the primary transition material and at least one slurry sintering aid, and wherein the transition layer comprises a porosity of from 0% to 15% by volume of the transition layer. from 85% to 99% by volume of the transition layer of a primary transition material being a rare earth disilicate, or a doped rare earth disilicate; and from 1% to 15% by volume of the transition layer of a secondary material selected from the group consisting of Fe 2 O 3 , iron silicates, rare earth iron oxides, Al 2 O 3 , mullite, rare earth aluminates, rare earth aluminosilicates, TiO 2 , rare earth titanates, Ga 2 O 3 , rare earth gallates, NiO, nickel silicates, rare earth nickel oxides, Lnb metals, Lnb 2 O 3 , Lnb 2 Si 2 O 7 , Lnb 2 SiO 5 , borosilicate glass, alkaline earth silicates, alkaline earth rare earth oxides, alkaline earth rare earth silicates, and mixtures thereof, wherein "Lnb" refers to a sub-set of rare earth metals having a melting point below 1450°C; wherein the transition layer comprises the primary transition material and at least one slurry sintering aid, and wherein the transition layer comprises a porosity of from 0% to 15% by volume of the transition layer. <EOS>