Controlling Oxygen Content by Varying Oxygen Partial Pressure in Chromium Oxynitride Thin Films Prepared by Pulsed Laser Deposition

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  • Suzuki Kazuma
    Extreme Energy-Density Research Institute, Nagaoka University of Technology
  • Endo Toshiyuki
    Extreme Energy-Density Research Institute, Nagaoka University of Technology
  • Fukushima Teruhisa
    Extreme Energy-Density Research Institute, Nagaoka University of Technology
  • Sato Aoi
    Extreme Energy-Density Research Institute, Nagaoka University of Technology
  • Suzuki Tsuneo
    Extreme Energy-Density Research Institute, Nagaoka University of Technology
  • Nakayama Tadachika
    Extreme Energy-Density Research Institute, Nagaoka University of Technology
  • Suematsu Hisayuki
    Extreme Energy-Density Research Institute, Nagaoka University of Technology
  • Niihara Koichi
    Extreme Energy-Density Research Institute, Nagaoka University of Technology

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Abstract

Chromium oxynitride Cr(N,O) thin films were prepared by pulsed laser deposition in a highly reactive atmosphere, which consisted of pure oxygen gas and nitrogen plasma from a radio-frequency radical source. In order to control the oxygen content in the thin films, oxygen partial pressure (PO<sub>2</sub>) in the chamber was varied from 5 to 10 × 10−5 Pa under a fixed total pressure of 1.5 × 10−2 Pa. The thin films were then characterized by X-ray diffraction, infrared spectroscopy, electron energy loss spectroscopy and nano-indentation testing. It was found that the oxygen content of the thin films changed from 0 to 62 mol% with increasing PO<sub>2</sub>. The thin films with only the NaCl-type (B1) Cr(N,O) phase were prepared under PO<sub>2</sub> < 7.5 × 10−5 Pa. The chromium content of the B1 phase decreased from 47 mol%, which was close to the stoichiometric composition of CrN, to 40 mol% when the oxygen content was increased. The hardness increased up to 32 GPa with increasing PO<sub>2</sub> up to 7.5 × 10−5 Pa.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 54 (7), 1140-1144, 2013

    The Japan Institute of Metals and Materials

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