Abstract
Glasses of the (65−x)PbO⋅xPbX2⋅35B2O3 system (where X=F, Cl, Br, and I) have been made and investigated by Raman measurements. Three low frequency bands with high Raman intensities have been observed at about 40, 105, and 135 cm−1, respectively. It is found that the intensities of the depolarized low frequency Raman contour peaked at 40 cm−1 are exceptionally high and strongly dependent on the halogen type and content. We attribute this nonsymmetric low‐frequency Raman contour to the collective modes of the BO3–PbO4 bridged local structures and propose a model to interpret the experimental data. Our results suggest that the liberation of these local structures is related to the lead as well as the halogen. Cl, Br, and I enter the glass as nonbridging anions and weaken the cohesion of the glass network in the increased order of Cl, Br, and I.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
