کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1642132 1517221 2016 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study of gamma ray induced defect centers in MnO doped calcium fluoro borophosphate glasses by means of EPR spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Study of gamma ray induced defect centers in MnO doped calcium fluoro borophosphate glasses by means of EPR spectroscopy
چکیده انگلیسی


• CaF2–P2O5–B2O3 glasses mixed with 0.2 mol% of MnO were prepared.
• Samples were exposed to γ-rays for dose rate of 1.5 kGy/h for two hours.
• ESR spectra were recorded in the temperature range 300–475 K.
• The spectra exhibited near axially symmetric signal with doublet hyperfine structure.
• The signal is attributed to PO42- radical formed by trapped hole O− orbital.

CaF2–P2O5–B2O3 glasses mixed with 0.2 mol% of MnO were prepared. The prepared samples were exposed to γ-rays for dose rate of 1.5 kGy/h for two hours and their EPR spectra were recorded in the temperature range 300–475 K. The spectra of pure as well as MnO doped glass samples exhibited a new and nearly axially symmetric (g⊥=2.0085 and g||=2.0090, A⊥= 34 G and A||= 52 G) signal with doublet hyperfine structure. The signal is attributed to PO42- radical formed by trapped hole on non-bonding orbital of oxygen. The analysis of these data together with thermoluminescence (TL) studies indicated that PO42- radical plays a crucial role in TL emission.

EPR spectra recorded at 475 K with super imposition of TL emission for calcium fluoro boro phosphate glass.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 167, 15 March 2016, Pages 284–287
نویسندگان
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