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Second Phases and Impurity Segregations in MgO- and NiO-CO-Doped Alumina

Published online by Cambridge University Press:  21 February 2011

K. Park ,
C. Sung  and
T. Vasilos
K. Park
Affiliation:
Center for Advanced Materials, University of Massachusetts, Lowell, MA 01854
C. Sung
Affiliation:
Center for Advanced Materials, University of Massachusetts, Lowell, MA 01854
T. Vasilos
Affiliation:
Department of Chemical Engineering, University of Massachusetts, Lowell, MA 01854
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Abstract

The microstructural and chemical characteristics of the segregated particles, Ni-(Mg)-Al spinel phases, and K-ß’’’ alumina precipitates in fine-grained alumina co-doped with 0.15 wt % of MgO and 0.10 wt % of NiO were studied using analytical transmission electron microscopy. The segregated Ni particles and second phases were generally found at triple junctions or on grain boundaries. The K-ß’’’ alumina precipitates were found to contain occasionally a high density of stacking faults. These microstructural observations point out the location of the dopants and impurities during the sintering process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 319: Symposia CB – Defect-Interface Interactions , 1993 , 75
Copyright
Copyright © Materials Research Society 1994

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