Structure of PbF2–TeO2 glasses and glass-ceramics
XRD, SEM, TEM, Raman and FTIR have been used to study the structure of PbF2–TeO2 glasses and glass-ceramics (10 ≤ PbF2 ≤ 90 mol%). Raman and FTIR spectra have been analyzed to track the change in fraction of TeO4 units (N4) with increasing PbF2. The results showed almost a linear decrease of N4 for...
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2020-05-01
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785419322549 |
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doaj-84a6f45106f842819bffdaff8bfa11612020-11-25T03:54:33ZengElsevierJournal of Materials Research and Technology2238-78542020-05-019340164024Structure of PbF2–TeO2 glasses and glass-ceramicsE.F. El Agammy0H. Doweidar1K. El-Egili2R. Ramadan3Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt; Corresponding author.Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura 35516, EgyptGlass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura 35516, EgyptMicrowave and Dielectrics Department, Physics Division, National Research Centre, Dokki, 12311 Cairo, EgyptXRD, SEM, TEM, Raman and FTIR have been used to study the structure of PbF2–TeO2 glasses and glass-ceramics (10 ≤ PbF2 ≤ 90 mol%). Raman and FTIR spectra have been analyzed to track the change in fraction of TeO4 units (N4) with increasing PbF2. The results showed almost a linear decrease of N4 for PbF2 ≤ 10 mol%, and then steadily decreased with increasing PbF2 contents. It is deduced that PbF2 entirely modifies the structure in the region of PbF2 ≤ 10 mol% and plays the dual role (modifier and former) for PbF2 > 10 mol%. The modifier PbF2 converts TeO4 units to Pb1/22+TeO3+1− and TeO3/2F units, while former PbF2 builds its own matrix. XRD patterns revealed formation of crystalline Te2O3F2 and PbF2 phases and the latter becomes the dominant phase for PbF2 > 50 mol%.http://www.sciencedirect.com/science/article/pii/S2238785419322549PbF2–TeO2 glassesRamanFTIRSEMTEMXRD |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
E.F. El Agammy H. Doweidar K. El-Egili R. Ramadan |
| spellingShingle |
E.F. El Agammy H. Doweidar K. El-Egili R. Ramadan Structure of PbF2–TeO2 glasses and glass-ceramics Journal of Materials Research and Technology PbF2–TeO2 glasses Raman FTIR SEM TEM XRD |
| author_facet |
E.F. El Agammy H. Doweidar K. El-Egili R. Ramadan |
| author_sort |
E.F. El Agammy |
| title |
Structure of PbF2–TeO2 glasses and glass-ceramics |
| title_short |
Structure of PbF2–TeO2 glasses and glass-ceramics |
| title_full |
Structure of PbF2–TeO2 glasses and glass-ceramics |
| title_fullStr |
Structure of PbF2–TeO2 glasses and glass-ceramics |
| title_full_unstemmed |
Structure of PbF2–TeO2 glasses and glass-ceramics |
| title_sort |
structure of pbf2–teo2 glasses and glass-ceramics |
| publisher |
Elsevier |
| series |
Journal of Materials Research and Technology |
| issn |
2238-7854 |
| publishDate |
2020-05-01 |
| description |
XRD, SEM, TEM, Raman and FTIR have been used to study the structure of PbF2–TeO2 glasses and glass-ceramics (10 ≤ PbF2 ≤ 90 mol%). Raman and FTIR spectra have been analyzed to track the change in fraction of TeO4 units (N4) with increasing PbF2. The results showed almost a linear decrease of N4 for PbF2 ≤ 10 mol%, and then steadily decreased with increasing PbF2 contents. It is deduced that PbF2 entirely modifies the structure in the region of PbF2 ≤ 10 mol% and plays the dual role (modifier and former) for PbF2 > 10 mol%. The modifier PbF2 converts TeO4 units to Pb1/22+TeO3+1− and TeO3/2F units, while former PbF2 builds its own matrix. XRD patterns revealed formation of crystalline Te2O3F2 and PbF2 phases and the latter becomes the dominant phase for PbF2 > 50 mol%. |
| topic |
PbF2–TeO2 glasses Raman FTIR SEM TEM XRD |
| url |
http://www.sciencedirect.com/science/article/pii/S2238785419322549 |
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AT efelagammy structureofpbf2teo2glassesandglassceramics AT hdoweidar structureofpbf2teo2glassesandglassceramics AT kelegili structureofpbf2teo2glassesandglassceramics AT rramadan structureofpbf2teo2glassesandglassceramics |
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