A turbine engine component (150, 200), comprising: a substrate; and a thermal barrier coating (208, 300) formed over the substrate, the thermal barrier coating (208, 300) is a multi-phase material, the multi-phase material being defined as a polycrystalline material consisting essentially of three phases, wherein: each phase forms an individual grain (302, 304, 306), adjacent individual grains (302, 304, 306) are separated by grain boundaries, each phase comprises an oxide compound, the multi-phase material is formed from three constituents, the three constituents consist of different materials that are not completely soluble in each other, and the three phases are not completely soluble in each other and do not form only one compound, wherein: the three constituents are ZrO 2, YO 1.5, and TaO 2.5, wherein the three constituents are present in the following amounts: about 10 mol.% to about 20 mol.% YO 1.5, about 20 mol.% to about 25 mol.% TaO 2.5, and a balance of ZrO 2, and the three phases are (Y+Ta)-doped tetragonal zirconia, yttrium tantalate YTaO 4, and orthorhombic phase Zr 6 Ta 2 O 17. a substrate; and a thermal barrier coating (208, 300) formed over the substrate, the thermal barrier coating (208, 300) is a multi-phase material, the multi-phase material being defined as a polycrystalline material consisting essentially of three phases, wherein: each phase forms an individual grain (302, 304, 306), adjacent individual grains (302, 304, 306) are separated by grain boundaries, each phase comprises an oxide compound, the multi-phase material is formed from three constituents, the three constituents consist of different materials that are not completely soluble in each other, and the three phases are not completely soluble in each other and do not form only one compound, wherein: the three constituents are ZrO 2, YO 1.5, and TaO 2.5, wherein the three constituents are present in the following amounts: about 10 mol.% to about 20 mol.% YO 1.5, about 20 mol.% to about 25 mol.% TaO 2.5, and a balance of ZrO 2, and the three phases are (Y+Ta)-doped tetragonal zirconia, yttrium tantalate YTaO 4, and orthorhombic phase Zr 6 Ta 2 O 17. each phase forms an individual grain (302, 304, 306), adjacent individual grains (302, 304, 306) are separated by grain boundaries, each phase comprises an oxide compound, the multi-phase material is formed from three constituents, the three constituents consist of different materials that are not completely soluble in each other, and the three phases are not completely soluble in each other and do not form only one compound, wherein: the three constituents are ZrO 2, YO 1.5, and TaO 2.5, wherein the three constituents are present in the following amounts: about 10 mol.% to about 20 mol.% YO 1.5, about 20 mol.% to about 25 mol.% TaO 2.5, and a balance of ZrO 2, and the three phases are (Y+Ta)-doped tetragonal zirconia, yttrium tantalate YTaO 4, and orthorhombic phase Zr 6 Ta 2 O 17. the three constituents are ZrO 2, YO 1.5, and TaO 2.5, wherein the three constituents are present in the following amounts: about 10 mol.% to about 20 mol.% YO 1.5, about 20 mol.% to about 25 mol.% TaO 2.5, and a balance of ZrO 2, and the three phases are (Y+Ta)-doped tetragonal zirconia, yttrium tantalate YTaO 4, and orthorhombic phase Zr 6 Ta 2 O 17.