Thermoluminescence in Lapis Lazuli crystal: Glow peaks and their connection with F-centers estimated by ESR analysis

Noemi B. Silva-Carrera, Nilo F. Cano, T. K. Gundu Rao, Jorge Sabino Ayala Arenas, Shigueo Watanabe

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3 Scopus citations


The mineral Lapis Lazuli exhibits three thermoluminescence (TL) peaks approximately at 140, 260 and 370 °C. The TL intensity of the three peaks grows with radiation dose and it saturates only beyond 9 kGy. Electron Spin Resonance (ESR) studies have been carried out to identify the defect centers responsible for the thermoluminescence peaks. The ESR spectrum of the as-received natural sample presented the typical six signals due to Mn2+ ion and a large signal around g=2.030 due to Fe3+ ion. Room temperature ESR spectrum of irradiated Lapis Lazuli shows the formation of a defect center. This center (center I) is identified as an F+-center (singly ionized oxygen vacancy) and seems to correlate with 140 and 250 °C TL peaks. An additional defect center is observed during thermal annealing experiments and this center (center II - assigned to F+-center) appears to originate from an F-center (oxygen vacancy with two electrons). This F-center, precursor of center II, may be related to the observed high temperature 360 °C TL peak in Lapis Lazuli.

Original languageEnglish
Pages (from-to)472-477
Number of pages6
JournalJournal of Luminescence
StatePublished - 1 Aug 2017

Bibliographical note

Funding Information:
The authors wish to thank Ms. E. Somessari and Mr. C. Gaia, Instituto de Pesquisas Energeticas e Nucleares (IPEN), Brazil, for kindly carrying out the irradiation of the samples. To FAPESP (Process number 2014/03085-0) for partial financial support and to CAPES (Process number BEX-9612130) for fellowship to T.K. Gundu Rao.

Publisher Copyright:
© 2017 Elsevier B.V.


  • ESR
  • F-center, Thermoluminescence
  • Lapis Lazuli


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