Core structure of CSL (coincident-site-lattice) boundaries in NiO. [Coincident-site-lattice]

Conference · Thu Oct 01 04:00:00 EDT 1987

OSTI ID:5484946

Merkle, K L; Reddy, J F; Wiley, C L; Smith, D J

Atomic resolution electron microscopy is used to study <001> CSL (coincident-site-lattice) tilt boundaries in NiO. Asymmetric as well as symmetric grain-boundary plane orientations are found in bicrystals grown by the Verneuil technique. The ..sigma.. = 5, (310) grain boundary is observed to occur in two distinct forms, both of which differ from previously proposed theoretical models. The ..sigma.. = 13, (510) boundary, in addition to also showing a multiplicity of structures, is not planar on an atomic scale, but includes displacements of structural units normal to the average grain-boundary plane. It is suggested that the reduced atomic density at high-purity ceramic-oxide grain boundaries is not only due to lattice expansion, but is in part due to a high concentration of Schottky pairs in the grain boundary. 11 refs., 8 figs.

• Research Organization: Argonne National Lab., IL (USA); Arizona State Univ., Tempe (USA). Center for Solid State Science
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5484946
• Report Number(s): CONF-870793-5; IS-3646; ON: DE88006009
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
BICRYSTALS
CHALCOGENIDES
CRYSTAL STRUCTURE
CRYSTALS
ELECTRON MICROSCOPY
GRAIN BOUNDARIES
MICROSCOPY
MICROSTRUCTURE
NICKEL COMPOUNDS
NICKEL OXIDES
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
TRANSITION ELEMENT COMPOUNDS