"Process for the production of K- or Rb-.beta.""- or -.beta.- aluminum oxide ion conductors"

US5474959A · kind A · utility

Assignee

• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Gunter Schafer · Stuttgart, DE
• Arnold Van Zyl · Ulm, DE
• Werner Weppner · Stuttgart, DE

Key dates

• Filing date: Mar 28, 1994
• Grant date: Dec 12, 1995
• Expiry date: Mar 28, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/6567
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention provides a process for the production of a K- or Rb-.beta."- or -.beta.-aluminum oxide powder preparation, wherein a cubic densely packed aluminum oxide (.gamma.-aluminum oxide) or a precursor thereof is subjected to attrition together with a doping material or a precursor thereof, the so obtained mixture is calcined in an oxygen-containing atmosphere, potassium oxide or rubidium oxide or a precursor of these compounds is added to the calcination product obtained, the mixture is subjected to attrition and then calcined in an oxygen-containing atmosphere at a temperature greater than 900.degree. C. The present invention also provides a process for the production of a ceramic formed body in which a powder obtained by the above process is converted by attrition, isostatic pressing and sintering into a ceramic formed body. Such a ceramic formed body can be used as an ion conductor.