Abstract
Titania nanotube arrays were synthesized electrochemically by anodization of titanium foils, and the synthesized titania nanotubes were then implanted with indium ions. The effect of In-ions implantation on crystallization and phase transformation of titania was investigated using in-situ high-temperature X-ray diffraction and synchrotron radiation diffraction from room temperature to 1000 °C. Diffraction results show that crystalline anatase first appeared at 400 °C in both the non-implanted and the In-implanted materials. The temperature at which crystalline rutile temperature appeared was 600 °C for non-implanted materials and 700 °C for In-implanted materials, and the indium implantation inhibited the anatase-to-rutile transformation. Although In3+ is expected to increase oxygen vacancy concentration and then the rate of titania transformation, the observations are consistent with implanted In-ions occupying the Ti sublattice substitutionally and then inhibiting the transformation. The relatively difficult anatase-to-rutile transformation in the In-implanted material appears to result from the relatively large In3+ radius (0.080 nm). The In3+ partly replaces the Ti4+ (0.061 nm), which provides a greater structural rigidity and prevents relaxation in the Ti bonding environment.
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ACKNOWLEDGMENTS
This research was supported by the funding from the Australian Institute of Nuclear Science and Engineering (AINGRA-11134), and the Australian Synchrotron (PD-3611). The authors would like to thank Prof. V.M. Prida from Department of Physics, University of Oviedo for XRD collection. Dr M. Ionescu of ANSTO assisted with work on ion-implantation.
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Albetran, H., Low, I.M. Effect of indium ion implantation on crystallization kinetics and phase transformation of anodized titania nanotubes using in-situ high-temperature radiation diffraction. Journal of Materials Research 31, 1588–1595 (2016). https://doi.org/10.1557/jmr.2016.83
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DOI: https://doi.org/10.1557/jmr.2016.83