Method of producing oxide ion conductor

Details Method of producing oxide ion conductor Method of producing oxide ion conductor

2006-10-24

2006-10-24

Kopec, Mark (Department: 1751)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000, C429S304000, C252S500000, C252S518100, C252S519100, C423S593100, C264S618000, C427S115000

Reexamination Certificate

active

07125622

ABSTRACT:
A lanthanum oxide (La2O3) powder, a germanium oxide (GeO2) powder, and a strontium carbonate (SrCO3) powder are mixed in a ratio so that a composition of the obtained composite oxide LalXm(AO4)6−n(ZO4)nOpsatisfies 8≦l+m<10, 0≦m≦2, 0≦n≦2 and 0≦p≦2. Thenafter, the materials are formed and sintered to prepare an oxide ion conductor. The crystalline structure of LalXm(AO4)6−n(ZO4)nOpbelongs to the apatite type structure. The conduction of oxide ion occurs when O2−14occupying the2asite of the apatite type structure moves along the c-axis direction.

REFERENCES:
patent: 8-208333 (1996-08-01), None
patent: 11-71169 (1999-03-01), None
Abram et al, “A novel enhancement of ionic conductivity in the catio-deficient apatite La9.33(SiO4)6O2,” J. Mater. Chem., 2001, 11, 1978-79.
Arikawa et al, “Oxide ion conductivity in Sr-doped La10Ge6O27 apatite oxide,” Solid. St. Ionics, 2000, (136-137), pp. 31-37.
Reina et al, “High oxide ion conductivity in Al-doped Germanium Oxyapatite,” Chem. Mater, 2005, 17, 596-600.
Fedorov et al, “Some properties of Single crystals of Oxygermanate-apatites,” Kristillografiya, 1982, 27(2), 384.
“Oxide Ion Conductivity in Sr-Doped La10Ge6O¢Apatite Oxide,” Solid State Ionics 136-137 (2000 edition); pp. 31-37.
“Ionic Conductivities of Apatite-Type Lax(GeO4)6O1.5x−12, (X=8-9.33) Polycrystals,” Journal of Materials Science Letters 20 (2001 edition), pp. 1627-1629.

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