Premium
Cation Tracer Diffusion in Cr 2 O 3 and Cr 2 O 3‐0.09 wt% Y 2 O 3
Author(s) -
PARK JONGHEE,
KING WAYNE E.,
ROTHMAN STEVEN J.
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb04910.x
Subject(s) - grain boundary , chromium , grain boundary diffusion coefficient , yttrium , materials science , lattice diffusion coefficient , analytical chemistry (journal) , lattice (music) , diffusion , dislocation , tracer , crystallography , effective diffusion coefficient , chemistry , metallurgy , thermodynamics , microstructure , physics , medicine , chromatography , magnetic resonance imaging , radiology , oxide , acoustics , nuclear physics
The cation diffusivities in the lattice and along dislocations and grain boundaries have been measured on sintered polycrysals of Cr 2 O 3 ; and Cr 2 Cr 2 O 3 ‐0.09 wt% Y 2 O 3 at1100°C and at the pO 2 corresponding to that of Cr/Cr 2 O 3 equilibrium at that temperature. Results for lattice and dislocation diffusivities in pure Cr 2 O 3 are in good agreement with previous work. The present results indicate that yttrium additions have negligible effect on lattice and dislocation diffusion. However, grain‐boundary diffusion in pure Cr 2 O 3 is significantly slower than grain‐boundary diffusion in Cr 2 O 3 ‐0.09 wt% Y 2 O 3 . The results are discussed in terms of their implications for the reactive‐element effect in high‐temperature oxidation of chromium‐containing alloys.