Method for producing .beta.-aluminas

Details Method for producing .beta.-aluminas Method for producing .beta.-aluminas

C - Chemistry, Metallurgy

01

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C01F 7/36 (2006.01) C01F 7/02 (2006.01) C04B 35/10 (2006.01) C04B 35/113 (2006.01) H01M 10/39 (2006.01)

Patent

CA 1249419

ABSTRACT OF THE INVENTION A beta and beta"-alumina precursor sol is prepared by controlled hydrolysis of chelated aluminum alkoxide in an alcohol solvent and, subsequently reacting it with a mixture of sodium, magnesium, and lithium alkoxides or acetates or a mixture thereof. The sol thus obtained can be converted into an amorphous transparent gel at low temperatures. This amorphous gel, crystallizes directly into crystalline beta-aluminas at about 1020°C. On heating to about this temperature, crystalline beta and beta"-alumina are formed which are useful as solid electrolyte material in making a sodium-sulfur battery.

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