The effect of UV exposure and heat treatment on crystallization behavior of photosensitive glasses


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Kıbrıslı O., Ersundu A. E.

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, cilt.124, 2018 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 124
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1007/s00339-018-1799-7
  • Dergi Adı: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

Özet

In this study, photosensitive glasses in the Na2O-ZnO-Al2O3-SiO2 system with photosensitizing agents (cerium, silver, tin, antimony) and halogenides (NaF and KBr) were synthesized through a conventional melt-quenching technique. The crystallization mechanism was investigated for solely heat-treated and UV-exposed + heat-treated samples using differential thermal analysis (DTA), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) techniques to understand the effect of UV exposure on crystallization behavior of photosensitive glasses. Accordingly, non-isothermal DTA measurements were performed at different heating rates to determine crystallization peak, T-p, and onset, T-c, temperatures. For solely heat-treated samples, the kinetic parameters such as the Avrami constant, n, and morphology index, m, were calculated as 1 from the Ozawa method indicating surface crystallization and the value of crystallization activation energy was calculated as 944 kJ/mol using modified Kissinger method. On the contrary, bulk crystallization was found to be predominant for UV exposed + heat-treated samples revealing that UV exposure is the primary cause of bulk crystallization in photosensitive glasses.