Characterization of heat treatment induced changes in Li--Na beta-alumina single crystals

Author: Dubin, R. R.
Published: United States : [publisher not identified], 1979.
Springfield, Va. : National Technical Information Service, [approximately 1979]
Physical Description: microfiche : negative ; 11 x 15 cm
Additional Creators: Bates, J. B., Kaneda, T., and Kasper, J. S.

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Summary

Single crystals of lithium--sodium beta alumina with 40 to 95% substitution of Li/sup +/ for Na/sup +/ were annealed in air and in vacuum at temperatures up to 1000/sup 0/C. The specimens were examined before and after each heat treatment by pulsed NMR, Raman scattering, infrared absorption, and x-ray diffraction. After annealing at 600/sup 0/C or above, the two original Raman bands due to /sup 7/Li/sup +/ vibrations merged into a single peak accompanied by a narrowing of spinel block phonon bands. The 1000/sup 0/C annealing introduced a broad /sup 7/Li NMR response and substantially reduced narrow line /sup 7/Li intensity. X-ray difffraction patterns showed that a second phase grows epitaxially with the beta-alumina structure as a result of high temperature heat treatment. The present results suggest that the thermal induced changes observed are due to diffusion of lithium out of the conducting plane and into the spinel-block.

Report Numbers

CONF-790538-6

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NTIS collection.

Note

DOE contract number: W-7405-ENG-26
OSTI Identifier 6262957
Research organization: General Electric Co., Schenectady, NY (USA).
Research organization: Oak Ridge National Lab., TN (USA).

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Characterization of heat treatment induced changes in Li--Na beta-alumina single crystals

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