Method of converting a precursor ceramic solid into a solid ceramic hydronium conductor
US4689126A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1984 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Nov 21, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
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; EQU (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; EQU (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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.