Phase Transformation of Yttria-Stabilized Zirconia (3 mol% Y<SUB>2</SUB>O<SUB>3</SUB>) in Fuel Cell Caused by Manganese Diffusion

• Kawashima Tsuyoshi

  Fundamental Research Laboratory, Tokyo Gas Co., Ltd.

• Hishinuma Masakazu

  Fundamental Research Laboratory, Tokyo Gas Co., Ltd.

Bibliographic Information

Other Title

• Phase Transformation of Yttria-Stabilized Zirconia(3mol% Y2O3)in Fuel Cell Caused by Manganese Diffusion
• Phase Transformation of Yttria-Stabiliz

Abstract

The diffusion coefficient of Mn in yttria-stabilized zirconia (YSZ, 3 mol%Y₂O₃) and the structural change in YSZ have been investigated. The diffusion coefficients of Mn were determined to be 7×10⁻¹⁴ m²/s at 1573 K and 2×10⁻¹³ m²/s at 1673 K by analyzing the concentration profiles of Mn in YSZ/Mn₃O₄ diffusion couples. The solubilities of MnO_x were 7.4 mol% and 7.6 mol% at 1573 and 1673 K, respectively. Remarkable grain growth was observed on the YSZ side near the interface. The dissolution of MnO_x almost up to the solubility limit of 7.6 mol% resulted in grain growth and the phase transformation from the tetragonal phase to the fluorite-type cubic phase. These results were discussed by comparing with the previous studies on the ZrO₂–Y₂O₃–MnO_x ternary system and on the ZrO₂–MnO binary system.

Journal

• Materials Transactions, JIM

  Materials Transactions, JIM 39 (5), 617-620, 1998

  The Japan Institute of Metals

Keywords

• zirconia
• yttria
• manganese
• diffusion
• diffusion coefficient
• solubility
• phase transformation

Details

• CRID: 1390282679222148736
• NII Article ID: 130003557042
• NII Article ID: 10003802825
• NII Book ID: AA10699969
• DOI: 10.2320/matertrans1989.39.617
• COI: 1:CAS:528:DyaK1cXksVWnsb0%3D
• ISSN: 2432471X
• ISSN: 09161821
• NDL BIB ID: 4484092
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4484092
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1989/39/5/39_5_617/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed