SCANDIA-STABILIZED ZIRCONIA POWDER FOR SOLID OXIDE FUEL CELLS, METHOD FOR PRODUCING SAME, SCANDIA-STABILIZED ZIRCONIA SINTERED BODY FOR SOLID OXIDE FUEL CELLS, METHOD FOR PRODUCING SAID SCANDIA-STABILIZED ZIRCONIA SINTERED BODY FOR SOLID OXIDE FUEL CELLS, AND SOLID OXIDE FUEL CELL

Title:

Document Type and Number:

WIPO Patent Application WO/2019/003422

Kind Code:

A1

Abstract:

Provided are: a highly ion-conductive scandia-stabilized zirconia powder for solid oxide fuel cells, which has a highly stable crystal structure, while having low grain boundary resistivity; a scandia-stabilized zirconia sintered body for solid oxide fuel cells; a method for producing this scandia-stabilized zirconia powder for solid oxide fuel cells; and a method for producing this scandia-stabilized zirconia sintered body for solid oxide fuel cells. A scandia-stabilized zirconia powder for solid oxide fuel cells which contains a compound represented by general formula (1) (ZrO2)1-x-a(Sc2O3)x(Al2O3)a. In formula (1), 0.09 ≤ x ≤ 0.11 and 0.002 ≤ a < 0.01 are satisfied. The crystal structure of this scandia-stabilized zirconia powder for solid oxide fuel cells is in a rhombohedral phase. The crystal structure of a sintered body of this scandia-stabilized zirconia powder is in a cubic phase. The sintered body of this scandia-stabilized zirconia powder has a grain boundary resistivity of 12 Ω·cm or less at 550°C.

Inventors:

TAMAZAKI FUMINORI (JP)

Application Number:

PCT/JP2017/024170

Publication Date:

January 03, 2019

Filing Date:

June 30, 2017

Export Citation:

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Assignee:

DAIICHI KIGENSO KAGAKU KOGYO (JP)

International Classes:

C04B35/48; H01M8/02; H01M8/12

Foreign References:

JPH06107462A	1994-04-19
JP2003020272A	2003-01-24
JP2002121070A	2002-04-23
JPH076622A	1995-01-10
JPH0769720A	1995-03-14
JP2017130385A	2017-07-27
JPH0569720A	1993-03-23
JP2000340240A	2000-12-08

Other References: