Investigations on structural and radiation shielding properties of Er3+ doped zinc bismuth borate glasses

Prabhu, Nimitha and Hegde, Vinod and Sayyed, M I and Agar, O and Kamath, Sudha D (2019) Investigations on structural and radiation shielding properties of Er3+ doped zinc bismuth borate glasses. Materials Chemistry and Physics, 230 (1). pp. 267-276. ISSN 0254-0584

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Novel optical glasses 10ZnO-5Na2CO3-10Bi2O3-(75-x)B2O3-xEr2O3 with x = (0, 0.1, 0.3, 0.5, 0.7, 1.0) mol%, were synthesized by melt quench technique and characterized through XRD, EDAX, optical and luminescent properties, before and after irradiating them with high energy (1.3 MeV) gamma rays. Moreover, the gamma photons attenuation characterizations for the samples under study were studied. The mass attenuation coefficients for the selected glasses were affected with the addition of Er2O3. Based on the findings from the mass attenuation coefficients, ZNBBEr-5 has better photon attenuation features in comparison with the other samples. Also, arising the Er2O3 content in the glasses, led to increase the effective atomic number. The mean free path for the prepared samples were compared with some shieling glasses. Shielding performance of the present glass samples against gamma radiation reveals pair production is prominent at 1.3 MeV. UV-VIS–NIR absorption edge was red shifted after gamma irradiation indicating the formation of electron/absorption centers in the glass matrix. Thermally stimulated Luminescence (TL) spectroscopy technique showed five electron trap centers at 445K, 491K, 545K, 590K, 620K with acceptable FOM [<5%] values. The number of overlapping peaks and their trapping parameters like kinetic order, activation energy, peak temperature, frequency factor and half life were determined using the Computerized Glow Curve Deconvolution (CGCD). Linear behaviour obtained through the dose response of the glass (5 kGy–50 kGy) proved their suitability for dosimetric application in the food irradiation zones and in red LEDs (< 50 kGy).

Item Type: Article
Uncontrolled Keywords: Doped glass, FTIR, optical band gap, photoluminescence, life time, CIE chromaticity
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 26 Apr 2019 10:17
Last Modified: 26 Apr 2019 10:17

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