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Ammonia-free synthesis and color tuning of oxynitride perovskite SrTaO2N-SrTiO3 solid solution by using alkoxide-derived Ta-Ti binary oxide gel precursors

  • Invited Paper: Sol-gel and hybrid materials for optical, photonic and optoelectronic applications
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Abstract

Solid solutions of strontium-tantalum oxynitride perovskite (SrTaO2N) and strontium-titanium oxide perovskite (SrTiO3) were prepared as possible candidates for novel inorganic pigments. The use of Ta-Ti binary oxide gel, which was obtained by the sol–gel method, was conducive to the development of single-phase solid solutions with a homogeneous atomic distribution. In addition, the use of urea as a nitriding agent availed to eliminate harmful ammonia gas during the synthesis. The color of solid solution depends on the band gap and Ti reduction state, which changes with Ti content. As a result, various chromatic colors, i.e., orange to yellow-green, were obtained from solid solutions. The solid solutions retained their color even after thermal and chemical resistance examinations. Because toxic substances were eliminated from the products and preparation process, the solid solutions show potentials to be applied as environmentally-friendly pigments.

Graphical Abstract

Highlights

  • Solid solutions of SrTaO2N and SrTiO3 were prepared by using alkoxide-derived metal oxide gels as precursors.

  • The Ta-Ti binary oxide gel, wal, and thermal stabilities hich was prepared by co-condensation of Ta- and Ti-alkoxides, was suitable as a precursor compared with the mixture of Ta2O5 gel and TiO2 gel.

  • Urea can be used as a solid nitriding agent to achieve ammonia-free synthesis of metal oxynitrides.

  • Various chromatic colors were obtained from solid solutions by changing the Ti/Ta composition.

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Acknowledgements

This work was supported by JSPS KAKENHI (Grant numbers JP18K19132, JP18H01709, JP19H04699, and JP20H02439). We thank Edanz (https://jp.edanz.com/ac) for editing a draft of this manuscript.

Funding

Japan Society for the Promotion of Science: KAKENHI, Grant Numbers: JP18K19132, JP18H01709, JP19H04699, and JP20H02439.

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Correspondence to Kiyofumi Katagiri.

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Sakata, T., Yoshiyuki, R., Urushidani, S. et al. Ammonia-free synthesis and color tuning of oxynitride perovskite SrTaO2N-SrTiO3 solid solution by using alkoxide-derived Ta-Ti binary oxide gel precursors. J Sol-Gel Sci Technol 104, 685–693 (2022). https://doi.org/10.1007/s10971-022-05801-4

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