Basic properties mapping of anodic oxides in the hafnium-niobium-tantalum ternary system.

ABSTRACT: A thin film combinatorial library deposited by co-sputtering of Hf, Nb and Ta was employed to characterise fundamental properties of the Hf-Nb-Ta system. Compositional mappings of microstructure and crystallography revealed similarities in alloy evolution. Distinct lattice distortion was observed upon addition of hexagonal Hf, leading to amorphisation of alloys containing more than 32 at.% Hf and less than 27 and 41 at.% Nb and Ta, respectively. Volta potential and open circuit potential mappings indicated minimal values for the highest Hf concentration. Localised anodisation of the library by scanning droplet cell microscopy revealed valve metal behaviour. Oxide formation factors above 2 nm V-1 were identified in compositional zones with high amounts of Nb and Ta. Fitting of electrochemic

SUBMITTER: Mardare AI 

PROVIDER: S-EPMC6095020 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature