Normal and anomalous heating rate effects on thermoluminescence of Ce-doped ZnB2O4
| Autor: | Z.G. Portakal, Mustafa Topaksu, T. Dogan, Nil Kucuk, Mehmet Yüksel, Sümeyra Balci-Yegen, S. Akça |
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| Přispěvatelé: | Çukurova Üniversitesi, Uludağ Üniversitesi/Fen-Edebiyet Fakültesi/Fizik Bölümü., Küçük, Nil |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Free electron model
Unclassified drug Nuclear science & technology Analytical chemistry 02 engineering and technology Repeated cycle Ce3 + doped ZnB2O4 Thermal quenching Thermoluminescence 030218 nuclear medicine & medical imaging Irradiation conditions Radiology nuclear medicine & medical imaging 0302 clinical medicine Mathematical model Beta-irradiation Transition temperature Borate Priority journal Radiation Chemistry Radiation dose Full width at the half maximums Tetraborate Lithium Borates Calculation Heating rate 021001 nanoscience & nanotechnology Frequency factors Chemistry inorganic & nuclear Phosphors Full width at half maximum Cerium doped zinc borate tetraoxide 0210 nano-technology Luminescent agent Clinical article Phosphor Activation energy Electron Light emission Article Heating 03 medical and health sciences Anomalous heating Case report Irradiation Kinetic-parameters Doping (additives) Dependence Photoluminescence Radiative process Probability Light intensity Temperature measurement Dopant Doping Controlled study Temperature sensitivity VHR method |
| Popis: | The effect of heating rate (HR) on thermoluminescence (TL) glow curves of 1%, 4%, and 10% Ce-3 (+) doped ZnB2O4 phosphors was investigated in detail. The glow peaks are examined and, activation energy (E) and frequency factor (s) are determined by using various heating rate (VHR) method. In the obtained glow curves with nine different HRs between 2 and 10 degrees C/s, it was observed that the TL intensities of the first peaks of all three samples and the second peak of 10% Ce-3 (+) doped sample decrease with increasing HR. The decrease in TL intensity was investigated whether it may be due to the presence of thermal quenching or not. On the other hand, the second glow peaks of 1, 4% Ce-3 (+) doped ZnB2O4 phosphors show an anomalous TL behavior, which the probability of the radiative processes increases due to recombination of free electrons, so the TL intensity increases with the HR. The graphs of full width at the half maximum (FWHM) versus HR were also plotted to evaluate the influence of HR on TL intensity. In this paper, we suggest that the non-localized Schon - Klasens model may give an explanation for the second peaks of 1, 4% Ce-3 (+) doped ZnB2O4 phosphors showing an unexpected increase with the increasing HR. In addition, the calculated E values of all doped phosphors were found similar in the range of 0.47-0.53 eV for peak 1 and 0.61-0.66 eV for peak 2. However, s values of Ce-3 (+) doped ZnB2O4 phosphors were found slightly different according to the dopant amount and the equation used. Furthermore, different amount of Ce-3 (+) doped samples indicate the similar properties for the repeated cycles of 5 Gy in the same irradiation conditions. |
| Databáze: | OpenAIRE |
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