Abstract
The diffusion coefficient of Mn in yttria-stabilized zirconia (YSZ, 3 mol%Y 2 O 3 ) and the structural change in YSZ have been investigated. The diffusion coefficients of Mn were determined to be 7 x 10 -14 m 2 /s at 1573 K and 2 x 10 -13 m 2 / at 1673 K by analyzing the concentration profiles of Mn in YSZ/Mn 3 O 4 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 ZrO 2 -Y 2 O 3 -MnO x ternary system and on the ZrO 2 -MnO binary system.
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