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Solid electrolytes: alkali-ion transport in skeleton structures. Semiannual technical summary report, 1 Jan--30 Jun 1976. [Na/sub 3/Zr/sub 2/Si/sub 2/PO/sub 12/ and K/sub 1/ /sub 9/Mg/sub 0/ /sub 95/Si/sub 1/ /sub 05/O/sub 4/]

Technical Report ·
OSTI ID:7313524
A new three-dimensional K/sup +/-ion conductor, K/sub 1.9/Mg/sub 0.95/Si/sub 1.05/O/sub 4/ was identified. Its resistivity at 300C is 28 ohm-cm, less than one-fourth the value for the best potassium ..beta..-alumina. More definitive measurements have been made of the Na/sup +/-ion transport in Na/sub 3/Zr/sub 2/Si/sub 2/PO/sub 12/ (NASICON). Its resistivity at 300C is 3 ohm-cm, compared with 4 ohm-cm for ..beta..''-alumina. Moisture tests have shown that NASICON is insensitive to water vapor. Static tests in molten Na/sub 2/S/sub 4/ for 10 days at 400C indicate chemical stability; similar tests in molten Na and dynamic tests in a Na--Na cell are in progress. Conclusive evaluation of stability awaits the preparation of additional test specimens. (GRA)
Research Organization:
Massachusetts Inst. of Tech., Lexington (USA). Lincoln Lab.
OSTI ID:
7313524
Report Number(s):
AD-A-032342
Country of Publication:
United States
Language:
English