Niobium K-Edge X-ray Absorption Spectroscopy of Doped TiO₂ Produced from Ilmenite Digested in Hydrochloric Acid.

ABSTRACT: Niobium doping of TiO₂ creates a conductive material with many new energy applications. When TiO₂ is precipitated from HCl solutions containing minor Nb, the Nb in solution is quantitatively deposited with the TiO₂. Here, we investigate the structure of Nb doped in anatase and rutile produced from ilmenite digested in hydrochloric acid. Nb K-edge X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) are used to characterize the environment of 0.08 atom % Nb doped in TiO₂. XANES shows clear structural differences between Nb-doped anatase and rutile. EXAFS for Nb demonstrates that Nb occupies a Ti site in TiO₂ with no near neighbors of Nb. Hydrolysis of Ti and Nb from acid solution, followed by

SUBMITTER: Haverkamp RG 

PROVIDER: S-EPMC9386810 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature