Doping and irradiation effects on the optical band gap of potassium tetrachlorozincate single crystals
| Autor: | M. M. Mostafa, A. M. Abousehly, M. A. Gaffar, A. Abu |
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| Rok vydání: | 2004 |
| Předmět: |
Nuclear and High Energy Physics
Radiation Materials science Band gap Potassium Doping chemistry.chemical_element Condensed Matter Physics Crystallography Reflection (mathematics) chemistry Attenuation coefficient Phase (matter) General Materials Science Irradiation Absorption (electromagnetic radiation) |
| Zdroj: | Radiation Effects and Defects in Solids. 159:25-35 |
| ISSN: | 1029-4953 1042-0150 |
| DOI: | 10.1080/10420150310001636610 |
| Popis: | Optical transmission and reflection measurements for crystals of potassium tetrachlorozincate (KZC) doped with Mn2+ or Ni2+ in different concentrations and irradiated with different γ-doses have been carried out along the three crystallographic axes. The results were analyzed to determine the absorption coefficient (α), type of optical transition and the optical energy gap (E g ). Different absorption bands along the three axes have been observed. Doping with Mn2+ or Ni2+ affected the intensity and position of these bands. Irradiation by γ either created or inhibited some of these bands. The nature of the transition involved was found to be the indirect allowed one. Doping with Mn2+ or Ni2+ up to 0.41 wt% and irradiating with γ-doses up to 150 kGy did not change the type of transition. The optical energy gap decreased considerably after doping and irradiating KZC. |
| Databáze: | OpenAIRE |
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