Hydronium (H.sub.3 O.sup.+) polycrystalline superionic conductor

Details Hydronium (H.sub.3 O.sup.+) polycrystalline superionic conductor Hydronium (H.sub.3 O.sup.+) polycrystalline superionic conductor

1984-09-25

1986-05-06

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

204421, C25B 114, G01N 2726

Patent

active

045869910

ABSTRACT:
An hydronium polycrystalline superionic conductor, having the formula (H.sub.3 O.sup.+,Na.sup.+).sub.5 (Re)Si.sub.4 O.sub.12, where Re=Y or Gd, is produced from precursor material being Na.sub.5 YSi.sub.4 O.sub.12 or Na.sub.5 GdSi.sub.4 O.sub.12. In order to accomplish the aforesaid a range of intermediate ceramics may be produced replacing part of the precursor ceramic sodium by ions of elements in 1A group of the Periodic Table that have an atomic weight above 32 and preferably ions of potassium, cesium, or mixtures of potassium and cesium.
To produce the superionic hydronium polycrystalline ceramic conductor and the intermediate ceramic from the feed ceramics aforesaid, the feed ceramic is placed in a chloride melt wherein part of the sodium in the feed ceramic lattice is replaced by an appropriate cation from the melt such as potassium and cesium. Subsequently, a field assisted ionic exchange takes place to now replace the interceded potassium and cesium ions with the hydronium (H.sub.3 O.sup.+) ion, whereby the aforesaid hydronium, superionic, solid polycrystalline ceramic conductor is achieved.

REFERENCES:
patent: 3440153 (1969-04-01), Arnoldi et al.
patent: 3486995 (1969-12-01), Evers
patent: 4097345 (1978-06-01), Shannon
patent: 4166013 (1979-08-01), Fray et al.
patent: 4223077 (1980-09-01), Taylor

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