Solvent based slurry compositions for making environmental barrier coatings and environmental barrier coatings comprising the same

An organic solvent based slurry composition for making an environmental barrier coating, the slurry composition comprising:

• from about 6.8 wt % to about 96.1 wt % of a solvent;
• from about 3.9 wt % to about 93.2 wt % of a primary material, wherein the primary material is a primary transition material comprising a rare earth disilicate;
• and
• from about 0.01 wt % to about 20 wt % of a slurry sintering aid, wherein the slurry sintering aid is a composition that:
• dissolves in the primary material at a sintering temperature of the primary material;
• increases a rate of diffusion of the primary material during sintering such that surface area reduction occurs at lower temperatures than would occur in the absence of the slurry sintering aid;
• and
• forms with the primary material a doped primary material containing the primary material and at least one doping composition selected from the group consisting of iron, aluminum, titanium, gallium, nickel, boron, alkali metals, alkaline-earth metals, and Lnb rare earth metals;
• wherein the doped primary material is a doped rare earth disilicate.