Preparation of a precursor solid for the manufacture of a...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/02 (2006.01) C04B 35/113 (2006.01) H01M 6/18 (2006.01)

Patent

CA 1191018

ABSTRACT In a method of making a solid polycrystaliine ceramic, that is a precursor conductor for the hydronium ion (HO3+), feed compounds, which in the preferred embodiment are alkalies in the ratio of 60 wt% Na2CO3 and 40 wt% K2CO3, are mixed with 3 wt% MgCO3 and the balance Al2O3, at the atomic scale whereupon a preferred, intermediate, crystalline powder is achieved with a chemical formula; (Na0?6K0?4)2O (3 W/o MgO) .beta./.beta."-Al2O3 yielding an ?(.beta.) of approximately 0.37 where; Image and .beta. and .beta." are the polymorphs of alumina. This powder can be compressed and sintered, for a very short period of time, so the value of ?(.beta.) does not migrate significantly, yet the surface energy levels of the polycrystals are relieved and a solid polycrystalline ceramic, of any predetermined shape, with the above formula is created. It is shown herein that this preferred solid has a conductivity greater than 10-1 (ohm)-1 (cm)-1 at 300°C.; 10-4 (ohm)-1 (cm)-1 at room tempera- ture; that the conductivity is discontinuous at selected values of ?(.beta.) vis a vis temperature; and, how to select ?(.beta.). Mixing at the atomic scale of the feed compounds may take place either by dissolving the feed compounds in water then freeze drying, or spray drying in a spray dryer; thereafter, calcine and drive off any H20 residual.

431067

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