Electron transfer between heterogeneous lanthanides in BaF2 crystals
| Autor: | E. A. Radzhabov, V.A. Kozlovsky |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Lanthanide Radiation Materials science Barium fluoride Analytical chemistry Thermal ionization Electron Thermal transfer 01 natural sciences 030218 nuclear medicine & medical imaging Ion Crystal 03 medical and health sciences Electron transfer chemistry.chemical_compound 0302 clinical medicine chemistry 0103 physical sciences Instrumentation |
| Zdroj: | Radiation Measurements. 122:63-66 |
| ISSN: | 1350-4487 |
| DOI: | 10.1016/j.radmeas.2019.01.013 |
| Popis: | Forward electron photo-transfer and reverse thermal transfer between divalent and trivalent heterogeneous lanthanides in barium fluoride crystals has been studied using optical absorption. In crystals activated by two heterogeneous lanthanides and grown in reducing conditions, one of the lanthanides becomes bivalent whereas the other lanthanide remains trivalent. Illumination of the crystal in the ultraviolet bands led to the transfer of electrons from divalent lanthalides (Eu, Yb, Sm) to trivalent ions (Ho, Nd, Dy, Tm, Sm, Yb). The thermal ionization energies to the conduction band of created lanthanides are determined from the thermal bleaching curves of absorption bands. The experimental energies are compared with the estimated energies of the Dorenbos model. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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