Extended X-Ray Absorption Fine Structures and Chemical Shifts for the Heavy Rare-Earth Oxides

作者: S. N. Gupta , V. P. Vijayavargiya , B. D. Padalia , B. C. Tripathi , M. N. Ghatikar

DOI: 10.1002/PSSB.2220820224

关键词:

摘要: L3-absorption edges and the associated extended X-ray absorption fine structures (EXAFS) for dysprosium, holmmm, thulium, ytterbium, lutetium in pure oxide form are investigated using a 600 mm curved crystal spectrograph. A forbidden transition corresponding to an electron transition, 2p3/2 - 4f (unoccupied), is detected Dy2.,O3, Ho203, Tm2O3 with open 4f-shell. Chemical shifts measured attempt made correlate these estimated effective charges on ions indicates new trend not reported by others. prominent peak, (white line), also recorded oxides. The reduced width of white lines oxides narrowing 5d band. metal-oxygen distances determined EXAFS methods agree crystallographie data. Shapes resemble each other while they differ from those metals. Die L3-Absorptionskanten und die verknupften ausgedehnten Rontgenabsorptionsfeinstruk-turen fur Dysprosium, Holmium, Thulium, Ytterbium Lutetium reiner Oxidform werden mit einem gebogenen mm-Kristallspektrographen untersucht. Es wird em ver-botener ubergang entsprechend elektronischen Ubergang, (unbesetzt), Dy2O3, Ho2O3 Tm203 offener 4f-Schale cntdeckt. Chemische Verschiebungen gemessen der Versuch, diese berechneten effektiven Ladungen den lonen zu korrelieren, ergibt einen neuen Trend bisher noch nicht veroffentlicht wurde. Ein herausragendes Absorp-tionsmaximum (weise Linie) ebenfalls Oxide gefunden. Die reduzierte Breite dieser weisen Linien zeigt Verschmalerung 5d-Bande. EXAFS-Methoden bcstimmten Metall-Sauerstoff-Abstande stimmen kristallographischen Werten uberein. Form untereinander uberein, wahrend sie sich von denen unter-scheiden, entsprechenden Metalle bestimmt werden.

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