Abstract
Ferroelastic rare earth tantalates (RETaO4) are widely researched as the next-generation thermal barrier coatings (TBCs), and RETaO4 powders are hugely significant for synthesizing their coatings. The current research used chemical co-precipitation within an automated experimental device to synthesize RETaO4 (RE = Nd, Sm, Gd, Ho, Er) powders. The device automatically monitored and controlled the solutions’ pH, improving the chemical co-precipitation efficiency. The crystal structure and microstructure of the RETaO4 powders can be controlled by changing the annealing temperature, and the materials undergo an m'-m phase transition. The m'-RETaO4 powders exhibit nano-size grains, while m-RETaO4 powders evince micron-size grains, altered by the annealing temperatures. A simultaneous thermal analysis estimates the reversive ferroelastic tetragonal-monoclinic phase transition temperatures. Overall, this research focuses on the synthesis, crystal structures, microstructures, and phase transition of the fabricated RETaO4 powders.
Published Version
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