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US 5,183,801 AGranted
Stabilized bismuth oxide
AssigneeGas Research Institute
InventorsAnil V. Virkar, Kuan-Zong Fung
Life of this patent
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Abstract
Disclosed is a stable bismuth oxide composition having excellent oxygen ion conductivity comprising: from 50 to 90 mole % Bi.sub.2 O.sub.3, from 10 to 40 mole % of a rare earth oxide, such as yttria; and from 0.1 to 10 mole % of an oxide compound, such as ZrO.sub.2 or ThO.sub.2. The composition retains its oxygen ion transport capabilities even after prolonged annealing.
Claims5
A stable bismuth oxide ceramic composition consisting essentially of:
- bismuth oxide substantially present in a high temperature phase as the predominant component;
- a rare earth oxide present in a quantity of about 10 mole percent to about 40 mole percent;
- and
- an oxide compound having a cationic element having a valence of four or more present in minor quantities of about 0.1 mole percent to about 10 mole percent.
1 more element
Dependencies are inferred from the claim text.