Method of converting a precursor ceramic solid into a solid ceramic hydronium conductor
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United States of America Patent
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Aug 25, 1987
Grant Date -
N/A
app pub date -
Nov 21, 1984
filing date -
Dec 20, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of converting a feed solid polycrystalline of .beta. alumina into a hydronium conductor requires the preselection of an appropriate feed ceramic preferably with a chemical formula; (Na.sub.0.6 K.sub.0.4).sub.2 O (3 w/o MgO).beta./.beta.'Al.sub.2 O.sub.3 and with a f(.beta.) of 0.37.+-.0.03 wherein ##EQU1## The crystallographic lattice is altered by placing the solid feed ceramic in an ionic solution or melt containing two or more ionic species of different ionic radii; the composition of the melt or solution being written: M.sub.1, M.sub.2 (M.sub.3 . . . ) X where M.sub.1 and M.sub.2 (and M.sub.3 etc.) are ions of dissimilar size and as examples sodium, potassium, lithium and hydronium ions. After a time the material is removed, washed and subjected to a field effect exchange whereby the desired hydronium conducting solid ceramic having the following chemical composition is achieved; (H.sub.3 O.sub.a.sup.+ /Na.sub.b.sup.+ /K.sub.c.sup.+).sub.2 O Z.beta./.beta.'Al.sub.2 O.sub.3 where (a)(b)(c)=0.fwdarw.1 and a+b+c=1 and Z is a stablizer of the .beta.' phase.
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