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The local structures around the metals in metal-doped MgO catalysts were studied by EXAFS and XANES spectroscopies in connection with their catalysis which markedly depends on the kinds of doped metal ions. In the M-MgO samples (M=Ni2+, Cu2+, and Co2+), the M ions occupied the octahedral sites of MgO lattice by replacement with Mg2+. On the other hand, in the system of M-MgO samples (M = Fe3+ and Cr3+ ) the M ions existed as the cluster structure with a Koch-Cohen type M4-framework. The pair sites of the cation vacancy and basic oxygen atom derived from the cluster formation may be corrected with the specific catalysis for the cross-coupling reaction

EXAFS AND XANES STUDIES ON THE LOCAL STRUCTURES OF METAL IONS IN METAL DOPED MgO SYSTEMS