Investigation of grain-boundary segregation in ceramic oxides by analytical scanning transmission electron microscopy. [MgO-NiO; Al/sub 2/O/sub 3/-Y/sub 2/O/sub 3/; NiO-Cr/sub 2/O/sub 3/; NiO-Al/sub 2/O/sub 3/]

Conference · Mon Sep 01 00:00:00 EDT 1980 · J. Am. Ceram. Soc.; (United States)

OSTI ID:6799036

Bender, B; Williams, D B; Notis, M R

Analytical scanning transmission electron microscopy (AEM) was used to study grain-boundary solute segregation in the systems MgO-NiO, Al/sub 2/O/sub 3/, NiO-Cr/sub 2/O/sub 3/, and NiO-Al/sub 2/O/sub 3/. Electron beam spreading within the specimen was incorporated into a model to quantitatively measure solute segregation. Grain-boundary segregation occurred in Al/sub 2/O/sub 3/-Y/sub 2/O/sub 3/ and NiO-Cr/sub 2/O/sub 3/ but was not detected in MgO-NiO and NiO-Al/sub 2/O/sub 3/ specimens. These results and the quantitative measurements agree with equilibrium solute segregation theories. Microhardness measurements indicate no difference in hardness between the grain boundary and the matrix for Cr-doped NiO, a system in which segregation was detected.

• Research Organization: Lehigh Univ., Bethlehem, PA
• DOE Contract Number: EY-76-5-02-2408
• OSTI ID: 6799036
• Journal Information: J. Am. Ceram. Soc.; (United States), Vol. 63:9/10; Conference: 81. annual meeting of the American Ceramic Society, Cincinnati, OH, USA, 1 May 1979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
SEGREGATION
CHROMIUM OXIDES
MAGNESIUM OXIDES
NICKEL OXIDES
YTTRIUM OXIDES
ELECTRON MICROSCOPY
GRAIN BOUNDARIES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHROMIUM COMPOUNDS
CRYSTAL STRUCTURE
MAGNESIUM COMPOUNDS
MICROSCOPY
MICROSTRUCTURE
NICKEL COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies