Mechanisms of impurity diffusion in rutile
Tracer diffusion of /sup 46/Sc, /sup 51/Cr, /sup 54/Mn, /sup 59/Fe, /sup 60/Co, /sup 63/Ni, and /sup 95/Zr, was measured as functions of crystal orientation, temperature, and oxygen partial pressure in rutile single crystals using the radioactive tracer sectioning technique. Compared to cation self-diffusion, divalent impurities (e.g., Co and Ni) diffuse extremely rapidly in TiO/sub 2/ and exhibit a large anisotropy in the diffusion behavior; divalent-impurity diffusion parallel to the c-axis is much larger than it is perpendicular to the c-axis. The diffusion of trivalent impurity ions (Sc and Cr) and tetravalent impurity ions (Zr) is similar to cation self-diffusion, as a function of temperature and of oxygen partial pressure. The divalent impurity ions Co and Ni apparently diffuse as interstitial ions along open channels parallel to the c-axis. The results suggest that Sc, Cr, and Zr ions diffuse by an interstitialcy mechanism involving the simultaneous and cooperative migration of tetravalent interstitial titanium ions and the tracer-impurity ions. Iron ions diffused both as divalent and as trivalent ions. 8 figures.
- Research Organization:
- Argonne National Lab., IL (USA); Mitsubishi Chemical Industries Ltd., Tokyo (Japan)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6918712
- Report Number(s):
- CONF-8406177-1; ON: DE84014741
- Resource Relation:
- Conference: 3. international conference on transport in non-stoichiometric compounds, University Park, PA, USA, 10 Jun 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM 51
DIFFUSION
COBALT 60
IRON 59
MANGANESE 54
NICKEL 63
RUTILE
ATOM TRANSPORT
SCANDIUM 46
ZIRCONIUM 95
MONOCRYSTALS
TRACER TECHNIQUES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHALCOGENIDES
CHROMIUM ISOTOPES
COBALT ISOTOPES
CRYSTALS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IRON ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
MANGANESE ISOTOPES
MATERIALS
MINERALS
MINUTES LIVING RADIOISOTOPES
NEUTRAL-PARTICLE TRANSPORT
NICKEL ISOTOPES
NUCLEI
ODD-ODD NUCLEI
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
RADIATION TRANSPORT
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
RADIOISOTOPES
SCANDIUM ISOTOPES
SECONDS LIVING RADIOISOTOPES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YEARS LIVING RADIOISOTOPES
ZIRCONIUM ISOTOPES
360204* - Ceramics
Cermets
& Refractories- Physical Properties