Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Structural Characteristics by Nitridation of Oxygen Added Cr Thin Films in NH3 Atmosphere

산소가 첨가된 Cr 박막의 NH3 분위기에서의 질화 처리에 의한 구조적 특성

  • Kim, Danbi (Department of Materials Science and Engineering, Hanbat National University) ;
  • Kim, Seontai (Department of Materials Science and Engineering, Hanbat National University)
  • 김단비 (한밭대학교 신소재공학과) ;
  • 김선태 (한밭대학교 신소재공학과)
  • Received : 2021.08.25
  • Accepted : 2021.11.03
  • Published : 2021.11.27
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Abstract

Cr thin films with O added are deposited on sapphire substrate by DC sputtering and are nitrided in NH3 atmosphere between 300 and 900 ℃ for various times. X-ray diffraction results show that nitridation begins at 500 ℃, forming CrN and Cr2N. Cr oxides of Cr2O3 are formed at 600 ℃. And, at temperatures higher than 900 ℃, the intermediate materials of Cr2N and Cr2O3 disappear and CrN is dominant. The atomic concentration ratios of Cr and O are 77% and 23%, respectively, over the entire thickness of as-deposited Cr thin film. In the sample nitrided at 600 ℃, a CrN layer in which O is substituted with N is formed from the surface to 90 nm, and the concentrations of Cr and N in the layer are 60% and 40%, respectively. For this reason, CrN and Cr2N are distributed in the CrN region, where O is substituted with N by nitridation, and Cr oxynitrides are formed in the region below this. The nitridation process is controlled by inter-diffusion of O and N and the parabolic growth law, with activation energy of 0.69 eV.

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References

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