A TEM study and non-isothermal crystallization kinetic of tellurite glass-ceramics |
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| Authors: | El Sayed Yousef A. E. Al-salami E. R. Shaaban |
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| Affiliation: | (1) Physics Department, Faculty of Science, Al-Azhar University, Assuit, 71542, Egypt;(2) Physics Department, Faculty of Science, King Khalid University, P.O. Box 9003, Abha, Saudi Arabia;(3) Present address: Physics Department, Faculty of Science, King Khalid University, P.O. Box 9003, Abha, Saudi Arabia |
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| Abstract: | The glass transition temperature was studied via differential thermal analysis of glasses in the system (100 − x)TeO2–5Bi2O3–xZnO and (100 − x)TeO2–10Bi2O3–xZnO where x = 15, 20, 25 in mol%. The crystallization behavior and microstructure development of the 0.7TeO2/0.1Bi2O3/0.2ZnO glass during annealing were investigated by non-isothermal differential thermal analysis (DTA), X-ray diffractometry, and transmission electron microscopy. The glass transition temperature, crystallization temperature, and the nature of crystalline phases formed were determined. From the heating rate dependence of the glass transition temperature, the glass transition activation energy was derived. From variation of DTA peak maximum temperature with heating rate, the activation energies of crystallization were calculated to be 305.8 and 197 kJ mol−1 for first and second crystallization exotherms, respectively. Moreover, synthesized crystalline Bi3.2Te0.8O6.4, Bi2Te4O11, and Zn2Te3O8 were investigated. In addition, the change in particle size with increasing annealing time was observed by high-polarized optical microscope. |
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