Abstract
The structure and behavior of ZrO 2 on Pd black were studied by means of extended X-ray absorption fine structure (EXAFS). The reversible structure change of ZrO 2 with the reduction at 773 K and oxidation at 673 K was observed. The Zr-Zr distances on ZrO 2 /Pd after oxidation at 673 K were determined to be 0.345 and 0.363 nm (named δ-ZrO 2 ), while ZrO 2 /Pd after reduction at 773 K showed the tetragonal ZrO 2 structure with a Zr-Zr distance at 0.366 nm
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