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Photo-Transferred Thermoluminescence Characteristics Of Beta-Irradiated Mgo Nanopowders

Oluşturulma Tarihi: 29-06-2018

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): Kimyasal teknoloji, Kimya mühendisliği,

Yazar(lar): Mami, Abeer K. (Yazar), Işık, Mehmet (Yazar),

Emeği Geçen(ler):

Anahtar Kelimeler

Thermoluminescence, MgO, Defects


Özet

Shallow trapping centers in MgO nanopowders were characterized using photo-transferred thermoluminescence measurements. Experiments were carried out in low temperature range of 10-300 K with constant heating rate. Shallow traps were filled with charge carriers firstly by irradiating the sample at room temperature using S90/Y90 source and then illuminating at 10 K using blue LED. Thermoluminescence glow curve exhibited one peak around 150 K. Curve fitting analyses showed that this peak is composed by individual peaks with maximum temperatures of 149.0 and 155.3 K. The activation energies of corresponding trapping centers were revealed as 0.70 and 0.91 eV. The dominant mechanism for TL process was found as second order kinetics which represent that fast retrapping is effective transitions taking place within the band gap. Analyses were also done using initial rise and peak shape methods. All results were in good agreement with each other.Structural characterization of MgO nanopowders were investigated using x-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy measurements. Analyses of experimental observations indicated that MgO nanopowders show good crystallinity with particle size around 20-30 nm.


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