XAS structural and electronic investigation of a new type of catalyst: AlGaPON

Substitution of oxygen by nitrogen in galloaluminophosphate oxides leads to compounds, with properties and applications improved as compared to the ox ide. The structural and electronic changes induced by the anionic substitut ion of oxygen by nitrogen on those amorphous compounds have been studied by XAS. The investigation of the EXAFS and XANES data have allowed us to high light some structural changes; in particular the existence of mixed tetrahe dra XOxNy (x being P, Al or Ga) have been demonstrated. Such a study is hel pful in understanding the variations in the surface acido-basic properties of these compounds.