Actions for Characterization of long period polytypoid structures in the Al2O3-AIN system

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Characterization of long period polytypoid structures in the Al2O3-AIN system

Author
Krishnan, K. M.
Published
United States : [publisher not identified], 1985
Springfield, Va.: National Technical Information Service, [approximately 1985]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Corbin, N. D., McCauley, J. W., Rai, R. S., and Thomas, G.

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Summary
Long period polytypoid structures observed along the pseudobinary Al2O3-A1N composition join at a composition of 95 mol% A1N have been investigated by convergent beam electron diffraction and lattice imaging. Two new long period structures, 32H (Ramsdell notation) and 16H with c-periodicities of 8.3 nm and 4.07 nm respectively, have been independently identified by these two techniques. However, the 32H polytypoid was sometimes found to be intergrown with faulted 27R long period structure of periodicity 7.2 nm. Further, it has been shown that the 32H polytypoid is stabilized by local compositional fluctations during the sintering process.
Report Numbers
DE86008379; LBL-20644; CONF-851217-62
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC03-76SF00098
OSTI Identifier 5979612
Research organization: Army Materials and Mechanics Research Center, Watertown, MA (USA).
Research organization: Lawrence Berkeley Lab., CA (USA).
View MARC record | catkey: 47363189