Mechanism of Cluster Formation on Cerium Borosilicate Glasses Based on TEM-EDP and SEM-EDEX Investigations
- 1 Physics Department, Sirte University, Sirte, Libya
- 2 Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt
Abstract
Cerium oxide has a great capacity to remove nonbridging oxygen atoms (NBO) from the glass network and serves as glass former units. The well formed CeO 4 units played the role of decreasing NBO from the silicate network and cause a reduction in the concentration of tetrahedral boron groups (N 4 ). The highest content of NBO in glass of lower CeO 2 (1 mol%) has a dominant role in constructing crystalline clusters in the glass. Higher CeO 2 concentration leads to formation of an amorphous glass network as documented by XRD and TEM-EDP spectra. Coordination of cerium with oxygen atoms gives uniform units of spherical morphology in the pure CeO 2 as well as in cerium rich glass. Clustered species has a great benefit in the field of application, used as a shielding material for ionized radiations.
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