PbF2–TeO2 glasses and glass–ceramics: a study of physical and optical properties

• Published in: Applied physics. A, Materials science & processing Vol. 127; no. 12
• Main Authors: El Agammy, E. F., Doweidar, H., El-Egili, K., Ramadan, R.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2021; Springer Nature B.V
• Subjects: Applied physics; Characterization and Evaluation of Materials; Condensed Matter Physics; Current carriers; Glass ceramics; Lead oxides; Machines; Manufacturing; Materials science; Metallizing; Molar volume; Nanotechnology; Optical and Electronic Materials; Optical properties; Packing density; Physics; Physics and Astronomy; Processes; Refractivity; Surfaces and Interfaces; Tellurium dioxide; Thin Films; Conductivity; Energy gap; PbF; Density; glasses and glass–ceramics; TeO
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-021-05069-5

Some physical and optical properties of x PbF 2 ⋅(100– x )TeO 2 (0 ≤  x  ≤ 90 mol%) glasses and glass–ceramics have been studied. Density increases linearly with increasing PbF 2 content up to 70 mol% PbO, then tends to be constant for 70 < PbF 2  ≤ 90 mol%. The molar volume remains constant in the first region then increases for PbF 2  > 70 mol%. The main factor which controls the molar volume is the change in free volume and packing density. There is a limited increase in conductivity with increasing PbF 2 content then it decreases for PbF 2  ≥ 50 mol%. Pb 2+ ions are the main charge carriers. The band gap E g and the linear refractive index n change in an opposite manner where E g increases with increasing PbF 2 content for PbF 2  ≤ 50 mol%, then it decreases sharply for PbF 2  > 70 mol%. For PbF 2  ≤ 50 mol%, the Urbach energy E U decreases then seems to be constant for further additions. Metallization criterion M and molar refractivity R m change in a similar manner to E g and n , respectively.