Fused sand-resistant turbine part

A turbine part, comprising

• a substrate, an environmental barrier and at least one reactive layer,
• the environmental barrier comprising at least one layer selected from a thermal insulation layer, a sublayer suitable for promoting adhesion between the substrate and the thermal insulation layer, and a protective layer suitable for protecting the substrate from oxidation and/or corrosion,
• the environmental barrier at least partially covering the substrate,
• the at least one reactive layer being suitable for reacting with at least one CMAS compound selected from a calcium oxide, a magnesium oxide, an aluminum oxide and a silicon oxide,
• the reactive layer covering at least a portion of the environmental barrier, wherein the material of the reactive layer comprises an oxide of formula A′A″BO5+δ, A′ being selected from a rare-earth element and yttrium, A″ being selected from a rare-earth element, yttrium and aluminum, B being selected from titanium, zirconium, hafnium, tantalum and niobium, δ being a real number comprised between 0 and 0.5,
• wherein the oxide of formula A′A″BO5+δ having has a rare-earth element atomic fraction comprised between 18% and 25%.