Method for preparing PB-. beta. ''-alumina ceramic
A method is described for substituting cations for Na ions in a formed polycrystalline structure body of Na-..beta..''-alumina, Na-..beta..''-ferrite, or Na-..beta..''-gallate consisting essentially of trivalent cation and O lattice and of Na ions which migrate in relation to the trivalent cation and O lattice of the structure under the influence of an electric field. The method consists of heating the body, contacting the body with a vapor source of K, Rb, or Cs ions heated to a temperature essentially equal to the temperature of the body, maintaining the body and the source of ions at the temperature, the temperature being sufficient to cause at least about 90% of the Na ions in the body to be replaced by the vapor source ions, immersing the resultant body in a molten salt having divalent and trivalent cations larger than Na ions and no greater than the vapor source ions, and maintaining the body immersed in the molten salt until about 90% of the vapor source ions are replaced by the divalent or trivalent cations, whereby a substituted formed polycrystalline body substantially free of cracks is obtained.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4585635
- OSTI ID:
- 5728115
- Country of Publication:
- United States
- Language:
- English
Similar Records
Method for preparing Pb-. beta. ''-alumina ceramic
Trivalent ion exchange in beta' alumina. Technical report
Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CESIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
CONTROL
CRYSTALS
ELECTRIC FIELDS
ELEMENTS
FERRIMAGNETIC MATERIALS
FERRITES
FLUIDS
GASES
HEATING
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
MOLTEN SALTS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLYCRYSTALS
POTASSIUM COMPOUNDS
QUANTITY RATIO
RUBIDIUM COMPOUNDS
SALTS
SODIUM COMPOUNDS
SYNTHESIS
TEMPERATURE CONTROL
TRANSITION ELEMENT COMPOUNDS
VAPORS