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Effect of oxygen and WO3 additive on anatase-to-rutile phase transformation in TiO2 nanoparticles

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Abstract

Phase transformation of TiO2 powder (P25) and pure anatase (PA) was investigated under pure oxygen as well as vacuum from 500 to 1,000 °C. The rutile percentage calculated based on the XRD data was used to estimate the phase transformation process. It was found that the vacuum suppressed the phase transformation of P25 relative to pure oxygen atmosphere. A model was proposed to explain the effect of oxygen on the phase transformation of TiO2. Furthermore, P25 samples showed lower phase transformation temperature (between 600 and 800 °C) compared with PA (over 1,000 °C). The existed rutile phase in P25 was regarded as a transformation inducer due to an interface between anatase and rutile phases since the nucleation activation energy on the interface is lower than that on the surface. And this interface effect is also adopted to explain the role of additive WO3, which retarded the phase transformation of P25 but promoted the phase transformation of PA.

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Acknowledgments

The authors gratefully acknowledge the National Natural Science Foundation of China for financial support to this work (No. 51302175 and No. 51272162). And this work was also supported by Program for Liaoning Excellent Talents in University (No. LJQ2014132) and Natural Science Foundation of Liaoning Province of China (No. 2013020132).

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Authors and Affiliations

  1. School of Mechanical Engineering, Shenyang University, Shenyang, 110044, China

    Meihan Wang, Jiaxing Wen & Zhaoxia Hou

  2. Center for Hyper Media Research, Tokyo Polytechnic University, 1583 Iiyama, Atsugi, Kanagawa, 243-0297, Japan

    Yutaka Sawada & Yoichi Hoshi

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  1. Meihan Wang
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  2. Jiaxing Wen
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  3. Yutaka Sawada
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  5. Zhaoxia Hou
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Correspondence to Meihan Wang.

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Wang, M., Wen, J., Sawada, Y. et al. Effect of oxygen and WO3 additive on anatase-to-rutile phase transformation in TiO2 nanoparticles. J Therm Anal Calorim 119, 435–439 (2015). https://doi.org/10.1007/s10973-014-4204-6

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  • DOI: https://doi.org/10.1007/s10973-014-4204-6

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