Titanium oxynitride (TiOxNy\documentclass[12pt]{minimal}
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\begin{document}$${\hbox {TiO}}_{x}{\hbox {N}}_{y}$$\end{document}) thin films were fabricated by ion beam-assisted sputtering deposition. Effects of oxygen contribution, assisting ion energy (Ea\documentclass[12pt]{minimal}
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\begin{document}$$E_{\mathrm{a}}$$\end{document}), assisting ion beam current (Ia\documentclass[12pt]{minimal}
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\begin{document}$$I_{\mathrm{a}}$$\end{document}) on the microstructure and dielectric behavior of the films were analyzed. The results show that increasing O content made the films to turn from fcc-TiN (111)-oriented to fcc TiOxNy\documentclass[12pt]{minimal}
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\begin{document}$${\hbox {TiO}}_{x}{{\hbox {N}}}_{y}$$\end{document} (220)-oriented. Proper Ea\documentclass[12pt]{minimal}
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\begin{document}$$E_{\mathrm{a}}$$\end{document} and low Ia\documentclass[12pt]{minimal}
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\begin{document}$$I_{\mathrm{a}}$$\end{document} can enhance the (220) orientation in TiOxNy\documentclass[12pt]{minimal}
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\begin{document}$${\hbox {TiO}}_{x}{{\hbox {N}}}_{y}$$\end{document} thin films. The increase in oxygen content leads to the red-shift of plasmonic resonant frequency and makes the films more dielectric. Higher Ea\documentclass[12pt]{minimal}
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\begin{document}$$E_{\mathrm{a}}$$\end{document} and Ia\documentclass[12pt]{minimal}
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\begin{document}$$I_{\mathrm{a}}$$\end{document} make the TiOxNy\documentclass[12pt]{minimal}
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\begin{document}$${\hbox {TiO}}_{x}{{\hbox {N}}}_{y}$$\end{document} films more metallic. Atomic composition is an important factor underlying the results. The study provides a method to control the plasmonic properties of oxynitride films in a wide range by atomic composition and assisting ions.