Correlation between thermoluminescence emission and phase transitions of tridymite


Balci-Yegen S., Boronat C., Garcia-Guinea J., TOPAKSU M. , Correcher V.

PHASE TRANSITIONS, cilt.91, ss.1122-1128, 2018 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 91 Konu: 11
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1080/01411594.2018.1515435
  • Dergi Adı: PHASE TRANSITIONS
  • Sayfa Sayıları: ss.1122-1128

Özet

Tridymite exhibits a complex 400nm-induced thermoluminescence spectra consisting of five groups of components at (i) 90 and 130 degrees C (due mainly to oxygen vacancies, substitution and interstitial atoms and/or impurities that create localized charge losses), (ii) 200 degrees C (linked to a partial phase transition), (iii) 230 degrees C (associated probably with alkali ions moving away from Al that leads to [AlO4]degrees hole-like or [GeO4/Li]degrees centers) and (iv) 320 degrees C (caused by both phase transition and electron recombination with the unstable holes trapped at oxygen vacancies next to Al sites). The application of the T-m-T-stop protocol confirms a continuum in the trap structure not only because of the successive shifting of the maxima with the increase of the temperature, but also with the enhancement of the activation energy values that have been assessed by means of the initial rise method.