Abstract
The phase transformation behavior of scandia stabilized zirconia in Ni-ScSZ cermet anodes was investigated in details by X-ray diffractometry (XRD) and Raman spectroscopy. Since explanations for the appearance of the tetragonal phase is not straight for word, possible effects of porosity, NiO dissolution and coexistence nickel metal were investigated. Dense or porous 10Sc1CeSZ disks, NiO doped 10Sc1CeSZ disks (0.5 to 2.0 mol% NiO) and sintered or porous NiO-10Sc1CeSZ mixture (Ni-10Sc1CeSZ cermet after reduction) were reduced under Ar-H2 mixture gas. Raman spectroscopy shows that 10Sc1CeSZ in the Ni-10Sc1CeSZ cermet partly transformed to the tetragonal phase on reduction. No transformation was observed for the 10Sc1CeSZ disk alone nor NiO doped samples. Although the presence of nickel is necessary for transformation, nickel dissolved into 10Sc1CeSZ has not apparent effect. Contact of nickel metal with 10Sc1CeSZ, i.e. three phase boundaries, has an important role in the transformation of 10Sc1CeSZ. Three different mechanisms are discussed.
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