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GOMAA EL DAMRAWI
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Volume 45 All articles Published: 19 May 2022 Article ID 0090
Structure–properties correlation based on tellurite glasses modified by silver oxide and lead iodide
WALEED AL MOHAMMEDI GOMAA EL DAMRAWI MOHAMED SHERBINY AMR MOHAMED ABDELGHANY
The structure of Ag$_2$O–TeO$_2$ glasses is being investigated to make the interpretation of the more complex PbI$_2$–Ag$_2$O–TeO$_2$ glasses easier. Using Raman vibrational, X-ray diffraction (XRD) and electron diffraction pattern (EDP) spectroscopy, the local environment of Te atoms and the crystallization behaviour of glasses were studied. The XRD spectra revealed that certain crystalline phases develop in the binary Ag$_2$O–TeO$_2$ glasses. The well-crystalline species are metastable Ag$_2$Te$_4$O$_9$ and Ag$_2$Te$_2$O$_5$. The results of transmission electron microscope and EDP agree well with those of X-ray diffraction (XRD), suggesting that crystalline-clustered species develop in glasses enriched with Ag$_2$O. The distinguishing feature of glasses in the trenay system containing PbI$_2$ is their amorphous nature. The Raman spectra are well-resolved, with distinct characteristics that identify various structural units of telluride. The primary building telluride structural units are [TeO$_4$] and [TeO$_{3+1}$]. But TeO$^{3–}$, TeO$_3$$^{2–}$ and Ag–Te species, on the other hand, are formed when PbI$_2$ concentration is increased
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Bulletin of Materials Science
Volume 46, 2023
All articles
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Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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