Phase evolution of reactive sputtering synthesized holmium silicate coatings

Holmium silicates are promising environmental barrier coatings (EBCs) materials for Si‐based non‐oxide ceramics due to their excellent thermal and mechanical properties. In the present work, the phase evolution of holmium silicate coatings synthesized by reactive sputtering was systematically studied. The monosilicate crystallized in an X1‐Ho 2 SiO 5 phase at 1000°C and transformed to an X2‐Ho 2 SiO 5 phase at 1200°C. The phase transition is not...