Neutron diffraction study of the reduction of NiAl{sub 2}O{sub 4}
- Department of Materials Science, Keck Laboratory, California Institute of Technology, Pasadena, California 91125 (United States)
- Manuel Lujan Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
The reduction of a solid NiAl{sub 2}O{sub 4} cylinder to a metal-ceramic composite consisting of Ni particles in an Al{sub 2}O{sub 3} matrix was monitored in situ at 1220 degree sign C with neutron powder diffraction. The reaction kinetics was determined with a time resolution of 30 min. The reduction is associated with a volume shrinkage. A comparison of finite element calculations and the changes in the measured lattice parameters suggests that creep has relaxed the residual strains that would otherwise result from the volume shrinkage. The data also indicate that structural evolution in unreduced NiAl{sub 2}O{sub 4} via a change in the cationic sublattice towards inverse spinel occurred and that led to a variation in lattice parameters. (c) 2000 American Institute of Physics.
- OSTI ID:
- 20215267
- Journal Information:
- Applied Physics Letters, Vol. 76, Issue 6; Other Information: PBD: 7 Feb 2000; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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