Investigation of Grain-Boundary Segregation in Ceramic Oxides by Analytical Scanning Transmission Electron Microscopy |
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| Authors: | B. BENDER D. B. WILLIAMS M. R. NOTIS |
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| Affiliation: | Department of Metallurgy and Materials Engineering, Lehigh University, Bethlehem, Pennsylvania 18015 |
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| Abstract: | ![]()
Analytical scanning transmission electron microscopy (AEM) was used to study grain-boundary solute segregation in the systems MgO-NiO, A12O3-Y, O3, NiO-Cr2O3, and NiO-Al2O3. Electron beam spreading within the specimen was incorporated into a model to quantitatively measure solute segregation. Grain-boundary segregation occurred in A12O3-Y2O3 and NiO-Cr2O3 but was not detected in MgO-NiO and NiO-Al2O3 specimens. These results and the quantitative measurements agree with equilibrium solute segregation theories. Microhard-ness measurements indicate no difference in hardness between the grain boundary and the matrix for Cr-doped NiO, a system in which segregation was detected. |
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