Cover Photograph: Button type specimen of a thermal barrier coating (TBC) for gas turbine application under test in a burner rig environment. Precursors of calcium-magnesium-aluminosilicates (CMAS) are injected to the flame to form corrosive deposits. The orange coloring indicates atomic emission spectra of dissolved CMAS constituents. Image Credit: Ms. Hiltrud Moitroux (Forschungszentrum Jülich GmbH). DOI: 10.1111/jace.16465