Oxygen Diffusion and Point Defects in Single Crystal Rutile

,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 28(12); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(12): 989.

Rutile 단결정에서 산소의 확산과 점결합

김명호, 박주석¹, 변재동²

창원대학교 재료공학과
¹한국동력자원 연구소
²고려대학교 재료공학과

Oxygen Diffusion and Point Defects in Single Crystal Rutile

ABSTRACT

By means of the secondary ion mass spectrometer, the tracer diffusion of oxygen in rutile single crystal was measured as function of temperature and oxygen partial pressure. The tracer diffusivity was determined from the depth profile of 18O. The Po2 dependence of D suggests that the dominant defects in TiO2-y are oxygen vacancies (V{{{{ { ‥} atop { o} }}) and interstitial titanium ions (Ti{{{{ {‥‥} atop {i} }}). The doubly ionized oxygen vacancies are prominent at low temperature and Po2. However, the tetravalent interstitial titanium ions predominate at teperature above 120$0^{circ}C$.