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The crystal structure of Sr 4 Mn 2 NiO 9 has been refined on single crystal. This phase belongs to the series A 1+x (A 'x B 1-x )O 3 (x=1/3) related to the 2H-hexagonal perovskite. The structure contains transition metals in chains of oxide polyhedra (trigonal prisms and octahedra); neighboring chains are separated from...
The reduction behaviour of CexZr1−xO2 and Pt or Pd supported on CexZr1−xO2 was investigated by means of XANES measured at the Ce LIII edge and magnetic susceptibility measurements. Both techniques agree quite closely for the materials studied. The presence of a noble metal greatly improves the reduction of the CexZr1−xO2 support at low temperatures. The reoxidation that occurred after evacuation...
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