International Journal for Innovation Education and Research

Alex Awuor Ogacho, Ajuoga P, Aduda BO. "International Journal for Innovation Education and Research." International Journal for Innovation Education and Research. 2015;3(6):140-146.


The effects of niobium doping (for doping concentrations: 0.02 – 0.06 at. % Nb5+) on the crystal structure of
TiO2 prepared by high temperature diffusion method were investigated. The samples were characterized using
energy dispersive X-ray fluorescence (EDXRF) and X- ray diffraction (XRD) spectroscopy to investigate the
chemical compositions, phase compositions and crystallinity of the thin films respectively. Despite the expected
high reutilization at high temperatures (>600oC), XRD results confirmed a significant suppression of anatase to
rutile phase transformation at even a higher synthesis (850oC) temperature. Grain growth retardation was also
observed in niobium doped TiO2, results which were attributed to Nb5+ substitution of lattice Ti4+.
Key words: Anatase, rutile, phase transformation, grain growth

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