GRAIN BOUNDARY DIFFUSION IN MGO: ORIGIN OF THE EFFECT,
Abstract
Preferential diffusion of Ni(2+) and Co(2+) along grain boundaries has been observed in certain bicrystals of MgO. This enhancement is due to impurity segregation at the boundary. The impurities responsible for the effect are the principal impurities contained within the single-crystal MgO: Ca, Si, and Fe. No enhancement has been observed in any bicrystal prepared above 1300C. This temperature corresponds to that at which studies of the mechanical properties of MgO have implied a reabsorption of impurity precipitates into solid solution. It is concluded that enhanced grain-boundary diffusion of cations in MgO is an extrinsic, rather than an intrinsic property of the boundary. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0628849
Entities
People
- B. J. Wuensch
- T. Vasilos