The local environments around substitutional Cr3+ or Fe3+ ions in doped alpha-Al2O3 have been studied experimentally by dichroic X-ray absorption at the Cr and Fe K-edges in single crystals. A reliable method has been applied to remove diffraction peaks. This paper shows that the dichroic EXAFS analysis leads to the precise determination of the environment around impurity ions in alpha-Al2O3. The Cr or Fe coordination shell in doped alpha-Al2O3 is similar to the one of Cr in alpha-Cr2O3 or of Fe in alpha-Fe2O3. Aluminum or oxygen atoms at a farther distance are weakly affected by the presence of the impurity.
X-ray natural linear dichroism (XNLD) applied to the determination of relaxations around transition metal impurities in alpha-Al2O3 / Gaudry, E.; Kiratisin, A.; Sainctavit, Ph.; Brouder, Ch.; Mauri, F.; Ramos, A.; Rogalev, A.; Goulon, J.. - In: PHYSICA SCRIPTA. - ISSN 0031-8949. - T115:(2005), pp. 1041-1043.
X-ray natural linear dichroism (XNLD) applied to the determination of relaxations around transition metal impurities in alpha-Al2O3
Mauri, F.;Ramos, A.;
2005
Abstract
The local environments around substitutional Cr3+ or Fe3+ ions in doped alpha-Al2O3 have been studied experimentally by dichroic X-ray absorption at the Cr and Fe K-edges in single crystals. A reliable method has been applied to remove diffraction peaks. This paper shows that the dichroic EXAFS analysis leads to the precise determination of the environment around impurity ions in alpha-Al2O3. The Cr or Fe coordination shell in doped alpha-Al2O3 is similar to the one of Cr in alpha-Cr2O3 or of Fe in alpha-Fe2O3. Aluminum or oxygen atoms at a farther distance are weakly affected by the presence of the impurity.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.