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US 7,682,528 B2Granted
Oxide ion conductor
AssigneeHonda Motor Co., Ltd.
InventorsYoshikatsu Higuchi, Masayuki Sugawara, Kagehisa Hamazaki, Keizo Uematsu, Susumu Nakayama
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Abstract
An La2O3 powder and an SiO2 powder are mixed with each other, and then heated. By heating, a porous material of LaXSi6O1.5X+12 (8≦X≦10) as a composite oxide is produced. Subsequently, the porous material is pulverized to obtain a powder, and the powder is added to a solvent to prepare a slurry. The slurry is solidified in a magnetic field to prepare a compact. After that, the compact is sintered, and an oxide ion conductor is obtained thereby.
Claims8
An oxide ion conductor comprising
- a composite oxide which has constituent elements of a trivalent element A, a tetravalent element B, and oxygen O, said composite oxide has a composition formula represented by AXB6O1.5X+12 provided that 8≦X≦10, and said composite oxide has an apatite type crystalline structure;
- wherein said crystal of said composite oxide has a hexagonal system, wherein said hexagonal system has magnetic susceptibilities in the a-axis direction and in the b-axis direction that are different from the magnetic susceptibility in the c-axis direction;
- said oxide ion conductor has anisotropy in the oxide ion conductivity;
- said oxide ion conductor is formed of a sintered product which is formed from excessively advanced grain growth, and
- directions of orientation of a crystal in said sintered product are oriented in a c-axis direction, wherein the oxide ion conductivity along the c-axis direction is greater than the oxide ion conductivity along the a-axis direction and the oxide ion conductivity along the b-axis direction.
2 more elements
Dependencies are inferred from the claim text.